From 89d079dc17e8a32397de827cc85c1f4911b90424 Mon Sep 17 00:00:00 2001 From: Jerome Brunet Date: Tue, 24 Sep 2019 14:39:53 +0200 Subject: clk: let init callback return an error code If the init callback is allowed to request resources, it needs a return value to report the outcome of such a request. Signed-off-by: Jerome Brunet Link: https://lkml.kernel.org/r/20190924123954.31561-3-jbrunet@baylibre.com Reviewed-by: Andrew Lunn Acked-by: Heiko Stuebner Signed-off-by: Stephen Boyd --- include/linux/clk-provider.h | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) (limited to 'include/linux') diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h index caf4b9df16eb..eed243c2c73e 100644 --- a/include/linux/clk-provider.h +++ b/include/linux/clk-provider.h @@ -190,8 +190,12 @@ struct clk_duty { * * @init: Perform platform-specific initialization magic. * This is not not used by any of the basic clock types. - * Please consider other ways of solving initialization problems - * before using this callback, as its use is discouraged. + * This callback exist for HW which needs to perform some + * initialisation magic for CCF to get an accurate view of the + * clock. It may also be used dynamic resource allocation is + * required. It shall not used to deal with clock parameters, + * such as rate or parents. + * Returns 0 on success, -EERROR otherwise. * * @debug_init: Set up type-specific debugfs entries for this clock. This * is called once, after the debugfs directory entry for this @@ -243,7 +247,7 @@ struct clk_ops { struct clk_duty *duty); int (*set_duty_cycle)(struct clk_hw *hw, struct clk_duty *duty); - void (*init)(struct clk_hw *hw); + int (*init)(struct clk_hw *hw); void (*debug_init)(struct clk_hw *hw, struct dentry *dentry); }; -- cgit v1.2.3 From f873744c29036cc734ec8ecbedd1a451ce61cef2 Mon Sep 17 00:00:00 2001 From: Jerome Brunet Date: Tue, 24 Sep 2019 14:39:54 +0200 Subject: clk: add terminate callback to clk_ops Add a terminate callback to the clk_ops to release the resources claimed in .init() Signed-off-by: Jerome Brunet Link: https://lkml.kernel.org/r/20190924123954.31561-4-jbrunet@baylibre.com Signed-off-by: Stephen Boyd --- drivers/clk/clk.c | 7 ++++++- include/linux/clk-provider.h | 3 +++ 2 files changed, 9 insertions(+), 1 deletion(-) (limited to 'include/linux') diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c index b8dc848a04f7..ef4416721777 100644 --- a/drivers/clk/clk.c +++ b/drivers/clk/clk.c @@ -3862,6 +3862,7 @@ static void clk_core_evict_parent_cache(struct clk_core *core) void clk_unregister(struct clk *clk) { unsigned long flags; + const struct clk_ops *ops; if (!clk || WARN_ON_ONCE(IS_ERR(clk))) return; @@ -3870,7 +3871,8 @@ void clk_unregister(struct clk *clk) clk_prepare_lock(); - if (clk->core->ops == &clk_nodrv_ops) { + ops = clk->core->ops; + if (ops == &clk_nodrv_ops) { pr_err("%s: unregistered clock: %s\n", __func__, clk->core->name); goto unlock; @@ -3883,6 +3885,9 @@ void clk_unregister(struct clk *clk) clk->core->ops = &clk_nodrv_ops; clk_enable_unlock(flags); + if (ops->terminate) + ops->terminate(clk->core->hw); + if (!hlist_empty(&clk->core->children)) { struct clk_core *child; struct hlist_node *t; diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h index eed243c2c73e..013dc667a500 100644 --- a/include/linux/clk-provider.h +++ b/include/linux/clk-provider.h @@ -197,6 +197,8 @@ struct clk_duty { * such as rate or parents. * Returns 0 on success, -EERROR otherwise. * + * @terminate: Free any resource allocated by init. + * * @debug_init: Set up type-specific debugfs entries for this clock. This * is called once, after the debugfs directory entry for this * clock has been created. The dentry pointer representing that @@ -248,6 +250,7 @@ struct clk_ops { int (*set_duty_cycle)(struct clk_hw *hw, struct clk_duty *duty); int (*init)(struct clk_hw *hw); + void (*terminate)(struct clk_hw *hw); void (*debug_init)(struct clk_hw *hw, struct dentry *dentry); }; -- cgit v1.2.3 From 9a9b5a4af066f1245d7848a5d5d5c8147c18aa28 Mon Sep 17 00:00:00 2001 From: Stephen Boyd Date: Fri, 30 Aug 2019 08:09:12 -0700 Subject: clk: gpio: Use DT way of specifying parents Nobody has used the gpio clk registration functions nor the gpio clk_ops exposed by the basic gpio clk type. Let's remove all those APIs and move the gpio clk support into the C file. Since nothing is using the exported APIs, simplify the driver to be a platform driver that uses clk_parent_data to pick 0th or 1st cell of the node's clocks property. Cc: Simon Horman Cc: Magnus Damm Cc: Geert Uytterhoeven Cc: Enric Balletbo i Serra Cc: Tony Lindgren Cc: Manivannan Sadhasivam Signed-off-by: Stephen Boyd Link: https://lkml.kernel.org/r/20190830150923.259497-2-sboyd@kernel.org --- drivers/clk/clk-gpio.c | 172 +++++++++++++++---------------------------- include/linux/clk-provider.h | 38 ---------- 2 files changed, 59 insertions(+), 151 deletions(-) (limited to 'include/linux') diff --git a/drivers/clk/clk-gpio.c b/drivers/clk/clk-gpio.c index 13304cf5f2a8..70397b4b5ffe 100644 --- a/drivers/clk/clk-gpio.c +++ b/drivers/clk/clk-gpio.c @@ -28,6 +28,26 @@ * parent - fixed parent. No clk_set_parent support */ +/** + * struct clk_gpio - gpio gated clock + * + * @hw: handle between common and hardware-specific interfaces + * @gpiod: gpio descriptor + * + * Clock with a gpio control for enabling and disabling the parent clock + * or switching between two parents by asserting or deasserting the gpio. + * + * Implements .enable, .disable and .is_enabled or + * .get_parent, .set_parent and .determine_rate depending on which clk_ops + * is used. + */ +struct clk_gpio { + struct clk_hw hw; + struct gpio_desc *gpiod; +}; + +#define to_clk_gpio(_hw) container_of(_hw, struct clk_gpio, hw) + static int clk_gpio_gate_enable(struct clk_hw *hw) { struct clk_gpio *clk = to_clk_gpio(hw); @@ -51,12 +71,11 @@ static int clk_gpio_gate_is_enabled(struct clk_hw *hw) return gpiod_get_value(clk->gpiod); } -const struct clk_ops clk_gpio_gate_ops = { +static const struct clk_ops clk_gpio_gate_ops = { .enable = clk_gpio_gate_enable, .disable = clk_gpio_gate_disable, .is_enabled = clk_gpio_gate_is_enabled, }; -EXPORT_SYMBOL_GPL(clk_gpio_gate_ops); static int clk_sleeping_gpio_gate_prepare(struct clk_hw *hw) { @@ -111,67 +130,49 @@ static int clk_gpio_mux_set_parent(struct clk_hw *hw, u8 index) return 0; } -const struct clk_ops clk_gpio_mux_ops = { +static const struct clk_ops clk_gpio_mux_ops = { .get_parent = clk_gpio_mux_get_parent, .set_parent = clk_gpio_mux_set_parent, .determine_rate = __clk_mux_determine_rate, }; -EXPORT_SYMBOL_GPL(clk_gpio_mux_ops); -static struct clk_hw *clk_register_gpio(struct device *dev, const char *name, - const char * const *parent_names, u8 num_parents, struct gpio_desc *gpiod, - unsigned long flags, const struct clk_ops *clk_gpio_ops) +static struct clk_hw *clk_register_gpio(struct device *dev, u8 num_parents, + struct gpio_desc *gpiod, + const struct clk_ops *clk_gpio_ops) { struct clk_gpio *clk_gpio; struct clk_hw *hw; struct clk_init_data init = {}; int err; + const struct clk_parent_data gpio_parent_data[] = { + { .index = 0 }, + { .index = 1 }, + }; - if (dev) - clk_gpio = devm_kzalloc(dev, sizeof(*clk_gpio), GFP_KERNEL); - else - clk_gpio = kzalloc(sizeof(*clk_gpio), GFP_KERNEL); - + clk_gpio = devm_kzalloc(dev, sizeof(*clk_gpio), GFP_KERNEL); if (!clk_gpio) return ERR_PTR(-ENOMEM); - init.name = name; + init.name = dev->of_node->name; init.ops = clk_gpio_ops; - init.flags = flags; - init.parent_names = parent_names; + init.parent_data = gpio_parent_data; init.num_parents = num_parents; + init.flags = CLK_SET_RATE_PARENT; clk_gpio->gpiod = gpiod; clk_gpio->hw.init = &init; hw = &clk_gpio->hw; - if (dev) - err = devm_clk_hw_register(dev, hw); - else - err = clk_hw_register(NULL, hw); - - if (!err) - return hw; - - if (!dev) { - kfree(clk_gpio); - } + err = devm_clk_hw_register(dev, hw); + if (err) + return ERR_PTR(err); - return ERR_PTR(err); + return hw; } -/** - * clk_hw_register_gpio_gate - register a gpio clock gate with the clock - * framework - * @dev: device that is registering this clock - * @name: name of this clock - * @parent_name: name of this clock's parent - * @gpiod: gpio descriptor to gate this clock - * @flags: clock flags - */ -struct clk_hw *clk_hw_register_gpio_gate(struct device *dev, const char *name, - const char *parent_name, struct gpio_desc *gpiod, - unsigned long flags) +static struct clk_hw *clk_hw_register_gpio_gate(struct device *dev, + int num_parents, + struct gpio_desc *gpiod) { const struct clk_ops *ops; @@ -180,88 +181,36 @@ struct clk_hw *clk_hw_register_gpio_gate(struct device *dev, const char *name, else ops = &clk_gpio_gate_ops; - return clk_register_gpio(dev, name, - (parent_name ? &parent_name : NULL), - (parent_name ? 1 : 0), gpiod, flags, ops); + return clk_register_gpio(dev, num_parents, gpiod, ops); } -EXPORT_SYMBOL_GPL(clk_hw_register_gpio_gate); -struct clk *clk_register_gpio_gate(struct device *dev, const char *name, - const char *parent_name, struct gpio_desc *gpiod, - unsigned long flags) +static struct clk_hw *clk_hw_register_gpio_mux(struct device *dev, + struct gpio_desc *gpiod) { - struct clk_hw *hw; - - hw = clk_hw_register_gpio_gate(dev, name, parent_name, gpiod, flags); - if (IS_ERR(hw)) - return ERR_CAST(hw); - return hw->clk; + return clk_register_gpio(dev, 2, gpiod, &clk_gpio_mux_ops); } -EXPORT_SYMBOL_GPL(clk_register_gpio_gate); - -/** - * clk_hw_register_gpio_mux - register a gpio clock mux with the clock framework - * @dev: device that is registering this clock - * @name: name of this clock - * @parent_names: names of this clock's parents - * @num_parents: number of parents listed in @parent_names - * @gpiod: gpio descriptor to gate this clock - * @flags: clock flags - */ -struct clk_hw *clk_hw_register_gpio_mux(struct device *dev, const char *name, - const char * const *parent_names, u8 num_parents, struct gpio_desc *gpiod, - unsigned long flags) -{ - if (num_parents != 2) { - pr_err("mux-clock %s must have 2 parents\n", name); - return ERR_PTR(-EINVAL); - } - - return clk_register_gpio(dev, name, parent_names, num_parents, - gpiod, flags, &clk_gpio_mux_ops); -} -EXPORT_SYMBOL_GPL(clk_hw_register_gpio_mux); - -struct clk *clk_register_gpio_mux(struct device *dev, const char *name, - const char * const *parent_names, u8 num_parents, struct gpio_desc *gpiod, - unsigned long flags) -{ - struct clk_hw *hw; - - hw = clk_hw_register_gpio_mux(dev, name, parent_names, num_parents, - gpiod, flags); - if (IS_ERR(hw)) - return ERR_CAST(hw); - return hw->clk; -} -EXPORT_SYMBOL_GPL(clk_register_gpio_mux); static int gpio_clk_driver_probe(struct platform_device *pdev) { - struct device_node *node = pdev->dev.of_node; - const char **parent_names, *gpio_name; + struct device *dev = &pdev->dev; + struct device_node *node = dev->of_node; + const char *gpio_name; unsigned int num_parents; struct gpio_desc *gpiod; - struct clk *clk; + struct clk_hw *hw; bool is_mux; int ret; + is_mux = of_device_is_compatible(node, "gpio-mux-clock"); + num_parents = of_clk_get_parent_count(node); - if (num_parents) { - parent_names = devm_kcalloc(&pdev->dev, num_parents, - sizeof(char *), GFP_KERNEL); - if (!parent_names) - return -ENOMEM; - - of_clk_parent_fill(node, parent_names, num_parents); - } else { - parent_names = NULL; + if (is_mux && num_parents != 2) { + dev_err(dev, "mux-clock must have 2 parents\n"); + return -EINVAL; } - is_mux = of_device_is_compatible(node, "gpio-mux-clock"); - gpio_name = is_mux ? "select" : "enable"; - gpiod = devm_gpiod_get(&pdev->dev, gpio_name, GPIOD_OUT_LOW); + gpiod = devm_gpiod_get(dev, gpio_name, GPIOD_OUT_LOW); if (IS_ERR(gpiod)) { ret = PTR_ERR(gpiod); if (ret == -EPROBE_DEFER) @@ -275,16 +224,13 @@ static int gpio_clk_driver_probe(struct platform_device *pdev) } if (is_mux) - clk = clk_register_gpio_mux(&pdev->dev, node->name, - parent_names, num_parents, gpiod, 0); + hw = clk_hw_register_gpio_mux(dev, gpiod); else - clk = clk_register_gpio_gate(&pdev->dev, node->name, - parent_names ? parent_names[0] : NULL, gpiod, - CLK_SET_RATE_PARENT); - if (IS_ERR(clk)) - return PTR_ERR(clk); + hw = clk_hw_register_gpio_gate(dev, num_parents, gpiod); + if (IS_ERR(hw)) + return PTR_ERR(hw); - return of_clk_add_provider(node, of_clk_src_simple_get, clk); + return devm_of_clk_add_hw_provider(dev, of_clk_hw_simple_get, hw); } static const struct of_device_id gpio_clk_match_table[] = { diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h index caf4b9df16eb..4bef76fab942 100644 --- a/include/linux/clk-provider.h +++ b/include/linux/clk-provider.h @@ -752,44 +752,6 @@ struct clk_hw *clk_hw_register_composite(struct device *dev, const char *name, unsigned long flags); void clk_hw_unregister_composite(struct clk_hw *hw); -/** - * struct clk_gpio - gpio gated clock - * - * @hw: handle between common and hardware-specific interfaces - * @gpiod: gpio descriptor - * - * Clock with a gpio control for enabling and disabling the parent clock - * or switching between two parents by asserting or deasserting the gpio. - * - * Implements .enable, .disable and .is_enabled or - * .get_parent, .set_parent and .determine_rate depending on which clk_ops - * is used. - */ -struct clk_gpio { - struct clk_hw hw; - struct gpio_desc *gpiod; -}; - -#define to_clk_gpio(_hw) container_of(_hw, struct clk_gpio, hw) - -extern const struct clk_ops clk_gpio_gate_ops; -struct clk *clk_register_gpio_gate(struct device *dev, const char *name, - const char *parent_name, struct gpio_desc *gpiod, - unsigned long flags); -struct clk_hw *clk_hw_register_gpio_gate(struct device *dev, const char *name, - const char *parent_name, struct gpio_desc *gpiod, - unsigned long flags); -void clk_hw_unregister_gpio_gate(struct clk_hw *hw); - -extern const struct clk_ops clk_gpio_mux_ops; -struct clk *clk_register_gpio_mux(struct device *dev, const char *name, - const char * const *parent_names, u8 num_parents, struct gpio_desc *gpiod, - unsigned long flags); -struct clk_hw *clk_hw_register_gpio_mux(struct device *dev, const char *name, - const char * const *parent_names, u8 num_parents, struct gpio_desc *gpiod, - unsigned long flags); -void clk_hw_unregister_gpio_mux(struct clk_hw *hw); - struct clk *clk_register(struct device *dev, struct clk_hw *hw); struct clk *devm_clk_register(struct device *dev, struct clk_hw *hw); -- cgit v1.2.3 From 576859dfc54897e405cd7c6ad683792737dcebfd Mon Sep 17 00:00:00 2001 From: Stephen Boyd Date: Fri, 30 Aug 2019 08:09:14 -0700 Subject: clk: fixed-rate: Remove clk_register_fixed_rate_with_accuracy() There aren't any users of this API anymore. Remove it. Cc: Manivannan Sadhasivam Signed-off-by: Stephen Boyd Link: https://lkml.kernel.org/r/20190830150923.259497-4-sboyd@kernel.org --- drivers/clk/clk-fixed-rate.c | 23 +++++++---------------- include/linux/clk-provider.h | 3 --- 2 files changed, 7 insertions(+), 19 deletions(-) (limited to 'include/linux') diff --git a/drivers/clk/clk-fixed-rate.c b/drivers/clk/clk-fixed-rate.c index 3ea41d5a97ab..80149912e21d 100644 --- a/drivers/clk/clk-fixed-rate.c +++ b/drivers/clk/clk-fixed-rate.c @@ -89,20 +89,6 @@ struct clk_hw *clk_hw_register_fixed_rate_with_accuracy(struct device *dev, } EXPORT_SYMBOL_GPL(clk_hw_register_fixed_rate_with_accuracy); -struct clk *clk_register_fixed_rate_with_accuracy(struct device *dev, - const char *name, const char *parent_name, unsigned long flags, - unsigned long fixed_rate, unsigned long fixed_accuracy) -{ - struct clk_hw *hw; - - hw = clk_hw_register_fixed_rate_with_accuracy(dev, name, parent_name, - flags, fixed_rate, fixed_accuracy); - if (IS_ERR(hw)) - return ERR_CAST(hw); - return hw->clk; -} -EXPORT_SYMBOL_GPL(clk_register_fixed_rate_with_accuracy); - /** * clk_hw_register_fixed_rate - register fixed-rate clock with the clock * framework @@ -125,8 +111,13 @@ struct clk *clk_register_fixed_rate(struct device *dev, const char *name, const char *parent_name, unsigned long flags, unsigned long fixed_rate) { - return clk_register_fixed_rate_with_accuracy(dev, name, parent_name, - flags, fixed_rate, 0); + struct clk_hw *hw; + + hw = clk_hw_register_fixed_rate_with_accuracy(dev, name, parent_name, + flags, fixed_rate, 0); + if (IS_ERR(hw)) + return ERR_CAST(hw); + return hw->clk; } EXPORT_SYMBOL_GPL(clk_register_fixed_rate); diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h index 4bef76fab942..d7082f421850 100644 --- a/include/linux/clk-provider.h +++ b/include/linux/clk-provider.h @@ -337,9 +337,6 @@ struct clk *clk_register_fixed_rate(struct device *dev, const char *name, struct clk_hw *clk_hw_register_fixed_rate(struct device *dev, const char *name, const char *parent_name, unsigned long flags, unsigned long fixed_rate); -struct clk *clk_register_fixed_rate_with_accuracy(struct device *dev, - const char *name, const char *parent_name, unsigned long flags, - unsigned long fixed_rate, unsigned long fixed_accuracy); void clk_unregister_fixed_rate(struct clk *clk); struct clk_hw *clk_hw_register_fixed_rate_with_accuracy(struct device *dev, const char *name, const char *parent_name, unsigned long flags, -- cgit v1.2.3 From 38d1e38093b7d85ed0fa3a28c13c3266db505b3b Mon Sep 17 00:00:00 2001 From: Stephen Boyd Date: Fri, 30 Aug 2019 08:09:15 -0700 Subject: clk: fixed-rate: Move to_clk_fixed_rate() to C file The only user of this macro is the fixed rate basic type. Move it there to avoid polluting provider drivers. Cc: Manivannan Sadhasivam Signed-off-by: Stephen Boyd Link: https://lkml.kernel.org/r/20190830150923.259497-5-sboyd@kernel.org --- drivers/clk/clk-fixed-rate.c | 2 ++ include/linux/clk-provider.h | 2 -- 2 files changed, 2 insertions(+), 2 deletions(-) (limited to 'include/linux') diff --git a/drivers/clk/clk-fixed-rate.c b/drivers/clk/clk-fixed-rate.c index 80149912e21d..557641ec4fd7 100644 --- a/drivers/clk/clk-fixed-rate.c +++ b/drivers/clk/clk-fixed-rate.c @@ -24,6 +24,8 @@ * parent - fixed parent. No clk_set_parent support */ +#define to_clk_fixed_rate(_hw) container_of(_hw, struct clk_fixed_rate, hw) + static unsigned long clk_fixed_rate_recalc_rate(struct clk_hw *hw, unsigned long parent_rate) { diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h index d7082f421850..db4c760e8645 100644 --- a/include/linux/clk-provider.h +++ b/include/linux/clk-provider.h @@ -328,8 +328,6 @@ struct clk_fixed_rate { unsigned long fixed_accuracy; }; -#define to_clk_fixed_rate(_hw) container_of(_hw, struct clk_fixed_rate, hw) - extern const struct clk_ops clk_fixed_rate_ops; struct clk *clk_register_fixed_rate(struct device *dev, const char *name, const char *parent_name, unsigned long flags, -- cgit v1.2.3 From 32205b75414e530dc6c95ac39f70ef8e194327e0 Mon Sep 17 00:00:00 2001 From: Stephen Boyd Date: Fri, 30 Aug 2019 08:09:16 -0700 Subject: clk: fixed-rate: Document accuracy member This member isn't documented, leading to kernel-doc warnings. Document it. Cc: Manivannan Sadhasivam Signed-off-by: Stephen Boyd Link: https://lkml.kernel.org/r/20190830150923.259497-6-sboyd@kernel.org --- include/linux/clk-provider.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include/linux') diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h index db4c760e8645..8bb517b670e3 100644 --- a/include/linux/clk-provider.h +++ b/include/linux/clk-provider.h @@ -321,6 +321,7 @@ struct clk_hw { * struct clk_fixed_rate - fixed-rate clock * @hw: handle between common and hardware-specific interfaces * @fixed_rate: constant frequency of clock + * @fixed_accuracy: constant accuracy of clock in ppb (parts per billion) */ struct clk_fixed_rate { struct clk_hw hw; -- cgit v1.2.3 From 2d34f09e79c9e96e9b748b320b9b0fa3d5e6b553 Mon Sep 17 00:00:00 2001 From: Stephen Boyd Date: Fri, 30 Aug 2019 08:09:17 -0700 Subject: clk: fixed-rate: Add support for specifying parents via DT/pointers After commit fc0c209c147f ("clk: Allow parents to be specified without string names") we can use DT or direct clk_hw pointers to specify parents. Create a generic function that shouldn't be used very often to encode the multitude of ways of registering a fixed rate clk with different parent information. Then add a bunch of wrapper macros that only pass down what needs to be passed down to the generic function to support this with less arguments. Cc: Manivannan Sadhasivam Signed-off-by: Stephen Boyd Link: https://lkml.kernel.org/r/20190830150923.259497-7-sboyd@kernel.org --- drivers/clk/clk-fixed-rate.c | 56 +++++++++--------------- include/linux/clk-provider.h | 100 ++++++++++++++++++++++++++++++++++++++++--- 2 files changed, 114 insertions(+), 42 deletions(-) (limited to 'include/linux') diff --git a/drivers/clk/clk-fixed-rate.c b/drivers/clk/clk-fixed-rate.c index 557641ec4fd7..e11ccdaf14a6 100644 --- a/drivers/clk/clk-fixed-rate.c +++ b/drivers/clk/clk-fixed-rate.c @@ -44,24 +44,17 @@ const struct clk_ops clk_fixed_rate_ops = { }; EXPORT_SYMBOL_GPL(clk_fixed_rate_ops); -/** - * clk_hw_register_fixed_rate_with_accuracy - register fixed-rate clock with - * the clock framework - * @dev: device that is registering this clock - * @name: name of this clock - * @parent_name: name of clock's parent - * @flags: framework-specific flags - * @fixed_rate: non-adjustable clock rate - * @fixed_accuracy: non-adjustable clock rate - */ -struct clk_hw *clk_hw_register_fixed_rate_with_accuracy(struct device *dev, - const char *name, const char *parent_name, unsigned long flags, - unsigned long fixed_rate, unsigned long fixed_accuracy) +struct clk_hw *__clk_hw_register_fixed_rate(struct device *dev, + struct device_node *np, const char *name, + const char *parent_name, const struct clk_hw *parent_hw, + const struct clk_parent_data *parent_data, unsigned long flags, + unsigned long fixed_rate, unsigned long fixed_accuracy, + unsigned long clk_fixed_flags) { struct clk_fixed_rate *fixed; struct clk_hw *hw; struct clk_init_data init = {}; - int ret; + int ret = -EINVAL; /* allocate fixed-rate clock */ fixed = kzalloc(sizeof(*fixed), GFP_KERNEL); @@ -71,17 +64,26 @@ struct clk_hw *clk_hw_register_fixed_rate_with_accuracy(struct device *dev, init.name = name; init.ops = &clk_fixed_rate_ops; init.flags = flags; - init.parent_names = (parent_name ? &parent_name: NULL); - init.num_parents = (parent_name ? 1 : 0); + init.parent_names = parent_name ? &parent_name : NULL; + init.parent_hws = parent_hw ? &parent_hw : NULL; + init.parent_data = parent_data; + if (parent_name || parent_hw || parent_data) + init.num_parents = 1; + else + init.num_parents = 0; /* struct clk_fixed_rate assignments */ + fixed->flags = clk_fixed_flags; fixed->fixed_rate = fixed_rate; fixed->fixed_accuracy = fixed_accuracy; fixed->hw.init = &init; /* register the clock */ hw = &fixed->hw; - ret = clk_hw_register(dev, hw); + if (dev || !np) + ret = clk_hw_register(dev, hw); + else if (np) + ret = of_clk_hw_register(np, hw); if (ret) { kfree(fixed); hw = ERR_PTR(ret); @@ -89,25 +91,7 @@ struct clk_hw *clk_hw_register_fixed_rate_with_accuracy(struct device *dev, return hw; } -EXPORT_SYMBOL_GPL(clk_hw_register_fixed_rate_with_accuracy); - -/** - * clk_hw_register_fixed_rate - register fixed-rate clock with the clock - * framework - * @dev: device that is registering this clock - * @name: name of this clock - * @parent_name: name of clock's parent - * @flags: framework-specific flags - * @fixed_rate: non-adjustable clock rate - */ -struct clk_hw *clk_hw_register_fixed_rate(struct device *dev, const char *name, - const char *parent_name, unsigned long flags, - unsigned long fixed_rate) -{ - return clk_hw_register_fixed_rate_with_accuracy(dev, name, parent_name, - flags, fixed_rate, 0); -} -EXPORT_SYMBOL_GPL(clk_hw_register_fixed_rate); +EXPORT_SYMBOL_GPL(__clk_hw_register_fixed_rate); struct clk *clk_register_fixed_rate(struct device *dev, const char *name, const char *parent_name, unsigned long flags, diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h index 8bb517b670e3..bb0c4c916a16 100644 --- a/include/linux/clk-provider.h +++ b/include/linux/clk-provider.h @@ -322,24 +322,112 @@ struct clk_hw { * @hw: handle between common and hardware-specific interfaces * @fixed_rate: constant frequency of clock * @fixed_accuracy: constant accuracy of clock in ppb (parts per billion) + * @flags: hardware specific flags */ struct clk_fixed_rate { struct clk_hw hw; unsigned long fixed_rate; unsigned long fixed_accuracy; + unsigned long flags; }; extern const struct clk_ops clk_fixed_rate_ops; +struct clk_hw *__clk_hw_register_fixed_rate(struct device *dev, + struct device_node *np, const char *name, + const char *parent_name, const struct clk_hw *parent_hw, + const struct clk_parent_data *parent_data, unsigned long flags, + unsigned long fixed_rate, unsigned long fixed_accuracy, + unsigned long clk_fixed_flags); struct clk *clk_register_fixed_rate(struct device *dev, const char *name, const char *parent_name, unsigned long flags, unsigned long fixed_rate); -struct clk_hw *clk_hw_register_fixed_rate(struct device *dev, const char *name, - const char *parent_name, unsigned long flags, - unsigned long fixed_rate); +/** + * clk_hw_register_fixed_rate - register fixed-rate clock with the clock + * framework + * @dev: device that is registering this clock + * @name: name of this clock + * @parent_name: name of clock's parent + * @flags: framework-specific flags + * @fixed_rate: non-adjustable clock rate + */ +#define clk_hw_register_fixed_rate(dev, name, parent_name, flags, fixed_rate) \ + __clk_hw_register_fixed_rate((dev), NULL, (name), (parent_name), NULL, \ + NULL, (flags), (fixed_rate), 0, 0) +/** + * clk_hw_register_fixed_rate_parent_hw - register fixed-rate clock with + * the clock framework + * @dev: device that is registering this clock + * @name: name of this clock + * @parent_hw: pointer to parent clk + * @flags: framework-specific flags + * @fixed_rate: non-adjustable clock rate + */ +#define clk_hw_register_fixed_rate_parent_hw(dev, name, parent_hw, flags, \ + fixed_rate) \ + __clk_hw_register_fixed_rate((dev), NULL, (name), NULL, (parent_hw), \ + NULL, (flags), (fixed_rate), 0, 0) +/** + * clk_hw_register_fixed_rate_parent_data - register fixed-rate clock with + * the clock framework + * @dev: device that is registering this clock + * @name: name of this clock + * @parent_data: parent clk data + * @flags: framework-specific flags + * @fixed_rate: non-adjustable clock rate + */ +#define clk_hw_register_fixed_rate_parent_data(dev, name, parent_hw, flags, \ + fixed_rate) \ + __clk_hw_register_fixed_rate((dev), NULL, (name), NULL, NULL, \ + (parent_data), (flags), (fixed_rate), 0, \ + 0) +/** + * clk_hw_register_fixed_rate_with_accuracy - register fixed-rate clock with + * the clock framework + * @dev: device that is registering this clock + * @name: name of this clock + * @parent_name: name of clock's parent + * @flags: framework-specific flags + * @fixed_rate: non-adjustable clock rate + * @fixed_accuracy: non-adjustable clock rate + */ +#define clk_hw_register_fixed_rate_with_accuracy(dev, name, parent_name, \ + flags, fixed_rate, \ + fixed_accuracy) \ + __clk_hw_register_fixed_rate((dev), NULL, (name), (parent_name), \ + NULL, NULL, (flags), (fixed_rate), \ + (fixed_accuracy), 0) +/** + * clk_hw_register_fixed_rate_with_accuracy_parent_hw - register fixed-rate + * clock with the clock framework + * @dev: device that is registering this clock + * @name: name of this clock + * @parent_hw: pointer to parent clk + * @flags: framework-specific flags + * @fixed_rate: non-adjustable clock rate + * @fixed_accuracy: non-adjustable clock accuracy + */ +#define clk_hw_register_fixed_rate_with_accuracy_parent_hw(dev, name, \ + parent_hw, flags, fixed_rate, fixed_accuracy) \ + __clk_hw_register_fixed_rate((dev), NULL, (name), NULL, (parent_hw) \ + NULL, NULL, (flags), (fixed_rate), \ + (fixed_accuracy), 0) +/** + * clk_hw_register_fixed_rate_with_accuracy_parent_data - register fixed-rate + * clock with the clock framework + * @dev: device that is registering this clock + * @name: name of this clock + * @parent_name: name of clock's parent + * @flags: framework-specific flags + * @fixed_rate: non-adjustable clock rate + * @fixed_accuracy: non-adjustable clock accuracy + */ +#define clk_hw_register_fixed_rate_with_accuracy_parent_data(dev, name, \ + parent_data, flags, fixed_rate, fixed_accuracy) \ + __clk_hw_register_fixed_rate((dev), NULL, (name), NULL, NULL, \ + (parent_data), NULL, (flags), \ + (fixed_rate), (fixed_accuracy), 0) + void clk_unregister_fixed_rate(struct clk *clk); -struct clk_hw *clk_hw_register_fixed_rate_with_accuracy(struct device *dev, - const char *name, const char *parent_name, unsigned long flags, - unsigned long fixed_rate, unsigned long fixed_accuracy); void clk_hw_unregister_fixed_rate(struct clk_hw *hw); void of_fixed_clk_setup(struct device_node *np); -- cgit v1.2.3 From 58f0c4ba565d91bb76e8ac2a809e99bfe75b4935 Mon Sep 17 00:00:00 2001 From: Stephen Boyd Date: Fri, 30 Aug 2019 08:09:18 -0700 Subject: clk: fixed-rate: Add clk flags for parent accuracy Some clk providers want to use the accuracy of the parent clk and use the fixed rate basic type clk to do that. This requires getting the parent clk and extracting the accuracy before registering the fixed rate clk. Let's add a flag for this and update the clk_ops to support this. Cc: Manivannan Sadhasivam Signed-off-by: Stephen Boyd Link: https://lkml.kernel.org/r/20190830150923.259497-8-sboyd@kernel.org --- drivers/clk/clk-fixed-rate.c | 7 ++++++- include/linux/clk-provider.h | 6 ++++++ 2 files changed, 12 insertions(+), 1 deletion(-) (limited to 'include/linux') diff --git a/drivers/clk/clk-fixed-rate.c b/drivers/clk/clk-fixed-rate.c index e11ccdaf14a6..77499a27c8fb 100644 --- a/drivers/clk/clk-fixed-rate.c +++ b/drivers/clk/clk-fixed-rate.c @@ -35,7 +35,12 @@ static unsigned long clk_fixed_rate_recalc_rate(struct clk_hw *hw, static unsigned long clk_fixed_rate_recalc_accuracy(struct clk_hw *hw, unsigned long parent_accuracy) { - return to_clk_fixed_rate(hw)->fixed_accuracy; + struct clk_fixed_rate *fixed = to_clk_fixed_rate(hw); + + if (fixed->flags & CLK_FIXED_RATE_PARENT_ACCURACY) + return parent_accuracy; + + return fixed->fixed_accuracy; } const struct clk_ops clk_fixed_rate_ops = { diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h index bb0c4c916a16..1a90fa46f550 100644 --- a/include/linux/clk-provider.h +++ b/include/linux/clk-provider.h @@ -323,6 +323,10 @@ struct clk_hw { * @fixed_rate: constant frequency of clock * @fixed_accuracy: constant accuracy of clock in ppb (parts per billion) * @flags: hardware specific flags + * + * Flags: + * * CLK_FIXED_RATE_PARENT_ACCURACY - Use the accuracy of the parent clk + * instead of what's set in @fixed_accuracy. */ struct clk_fixed_rate { struct clk_hw hw; @@ -331,6 +335,8 @@ struct clk_fixed_rate { unsigned long flags; }; +#define CLK_FIXED_RATE_PARENT_ACCURACY BIT(0) + extern const struct clk_ops clk_fixed_rate_ops; struct clk_hw *__clk_hw_register_fixed_rate(struct device *dev, struct device_node *np, const char *name, -- cgit v1.2.3 From 1f1bb96d3a1ac8c02878a437927a00840cc62e70 Mon Sep 17 00:00:00 2001 From: Stephen Boyd Date: Fri, 30 Aug 2019 08:09:19 -0700 Subject: clk: fixed-rate: Document that accuracy isn't a rate This kernel-doc talks about a rate for the accuracy. That's wrong. Cc: Manivannan Sadhasivam Signed-off-by: Stephen Boyd Link: https://lkml.kernel.org/r/20190830150923.259497-9-sboyd@kernel.org --- include/linux/clk-provider.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'include/linux') diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h index 1a90fa46f550..89ca2c42763b 100644 --- a/include/linux/clk-provider.h +++ b/include/linux/clk-provider.h @@ -394,7 +394,7 @@ struct clk *clk_register_fixed_rate(struct device *dev, const char *name, * @parent_name: name of clock's parent * @flags: framework-specific flags * @fixed_rate: non-adjustable clock rate - * @fixed_accuracy: non-adjustable clock rate + * @fixed_accuracy: non-adjustable clock accuracy */ #define clk_hw_register_fixed_rate_with_accuracy(dev, name, parent_name, \ flags, fixed_rate, \ -- cgit v1.2.3 From 9611b3aacc1c1af7cb96d35ca5f1e55fdd44f697 Mon Sep 17 00:00:00 2001 From: Stephen Boyd Date: Fri, 30 Aug 2019 08:09:21 -0700 Subject: clk: mux: Add support for specifying parents via DT/pointers After commit fc0c209c147f ("clk: Allow parents to be specified without string names") we can use DT or direct clk_hw pointers to specify parents. Create a generic function that shouldn't be used very often to encode the multitude of ways of registering a mux clk with different parent information. Then add a bunch of wrapper macros that only pass down what needs to be passed down to the generic function to support this with less arguments. Note: the msm drm driver passes an anonymous array through the macro which seems to confuse my compiler. Adding a parenthesis around the whole thing at the call site seems to fix it but it must be wrong. Maybe it's better to split this patch and pick out the array bits there? Cc: Rob Clark Cc: Sean Paul Cc: Manivannan Sadhasivam Signed-off-by: Stephen Boyd Link: https://lkml.kernel.org/r/20190830150923.259497-11-sboyd@kernel.org --- drivers/clk/clk-mux.c | 58 ++++++++++-------------------- drivers/gpu/drm/msm/dsi/pll/dsi_pll_10nm.c | 4 +-- drivers/gpu/drm/msm/dsi/pll/dsi_pll_28nm.c | 4 +-- include/linux/clk-provider.h | 56 +++++++++++++++++++---------- 4 files changed, 60 insertions(+), 62 deletions(-) (limited to 'include/linux') diff --git a/drivers/clk/clk-mux.c b/drivers/clk/clk-mux.c index 570b6e5b603b..e54e79714818 100644 --- a/drivers/clk/clk-mux.c +++ b/drivers/clk/clk-mux.c @@ -145,17 +145,19 @@ const struct clk_ops clk_mux_ro_ops = { }; EXPORT_SYMBOL_GPL(clk_mux_ro_ops); -struct clk_hw *clk_hw_register_mux_table(struct device *dev, const char *name, - const char * const *parent_names, u8 num_parents, - unsigned long flags, - void __iomem *reg, u8 shift, u32 mask, +struct clk_hw *__clk_hw_register_mux(struct device *dev, struct device_node *np, + const char *name, u8 num_parents, + const char * const *parent_names, + const struct clk_hw **parent_hws, + const struct clk_parent_data *parent_data, + unsigned long flags, void __iomem *reg, u8 shift, u32 mask, u8 clk_mux_flags, u32 *table, spinlock_t *lock) { struct clk_mux *mux; struct clk_hw *hw; struct clk_init_data init = {}; u8 width = 0; - int ret; + int ret = -EINVAL; if (clk_mux_flags & CLK_MUX_HIWORD_MASK) { width = fls(mask) - ffs(mask) + 1; @@ -177,6 +179,8 @@ struct clk_hw *clk_hw_register_mux_table(struct device *dev, const char *name, init.ops = &clk_mux_ops; init.flags = flags; init.parent_names = parent_names; + init.parent_data = parent_data; + init.parent_hws = parent_hws; init.num_parents = num_parents; /* struct clk_mux assignments */ @@ -189,7 +193,10 @@ struct clk_hw *clk_hw_register_mux_table(struct device *dev, const char *name, mux->hw.init = &init; hw = &mux->hw; - ret = clk_hw_register(dev, hw); + if (dev || !np) + ret = clk_hw_register(dev, hw); + else if (np) + ret = of_clk_hw_register(np, hw); if (ret) { kfree(mux); hw = ERR_PTR(ret); @@ -197,53 +204,24 @@ struct clk_hw *clk_hw_register_mux_table(struct device *dev, const char *name, return hw; } -EXPORT_SYMBOL_GPL(clk_hw_register_mux_table); +EXPORT_SYMBOL_GPL(__clk_hw_register_mux); struct clk *clk_register_mux_table(struct device *dev, const char *name, const char * const *parent_names, u8 num_parents, - unsigned long flags, - void __iomem *reg, u8 shift, u32 mask, + unsigned long flags, void __iomem *reg, u8 shift, u32 mask, u8 clk_mux_flags, u32 *table, spinlock_t *lock) { struct clk_hw *hw; - hw = clk_hw_register_mux_table(dev, name, parent_names, num_parents, - flags, reg, shift, mask, clk_mux_flags, - table, lock); + hw = clk_hw_register_mux_table(dev, name, parent_names, + num_parents, flags, reg, shift, mask, + clk_mux_flags, table, lock); if (IS_ERR(hw)) return ERR_CAST(hw); return hw->clk; } EXPORT_SYMBOL_GPL(clk_register_mux_table); -struct clk *clk_register_mux(struct device *dev, const char *name, - const char * const *parent_names, u8 num_parents, - unsigned long flags, - void __iomem *reg, u8 shift, u8 width, - u8 clk_mux_flags, spinlock_t *lock) -{ - u32 mask = BIT(width) - 1; - - return clk_register_mux_table(dev, name, parent_names, num_parents, - flags, reg, shift, mask, clk_mux_flags, - NULL, lock); -} -EXPORT_SYMBOL_GPL(clk_register_mux); - -struct clk_hw *clk_hw_register_mux(struct device *dev, const char *name, - const char * const *parent_names, u8 num_parents, - unsigned long flags, - void __iomem *reg, u8 shift, u8 width, - u8 clk_mux_flags, spinlock_t *lock) -{ - u32 mask = BIT(width) - 1; - - return clk_hw_register_mux_table(dev, name, parent_names, num_parents, - flags, reg, shift, mask, clk_mux_flags, - NULL, lock); -} -EXPORT_SYMBOL_GPL(clk_hw_register_mux); - void clk_unregister_mux(struct clk *clk) { struct clk_mux *mux; diff --git a/drivers/gpu/drm/msm/dsi/pll/dsi_pll_10nm.c b/drivers/gpu/drm/msm/dsi/pll/dsi_pll_10nm.c index 8f6100db90ed..1c894548dd72 100644 --- a/drivers/gpu/drm/msm/dsi/pll/dsi_pll_10nm.c +++ b/drivers/gpu/drm/msm/dsi/pll/dsi_pll_10nm.c @@ -751,9 +751,9 @@ static int pll_10nm_register(struct dsi_pll_10nm *pll_10nm) snprintf(parent4, 32, "dsi%d_pll_post_out_div_clk", pll_10nm->id); hw = clk_hw_register_mux(dev, clk_name, - (const char *[]){ + ((const char *[]){ parent, parent2, parent3, parent4 - }, 4, 0, pll_10nm->phy_cmn_mmio + + }), 4, 0, pll_10nm->phy_cmn_mmio + REG_DSI_10nm_PHY_CMN_CLK_CFG1, 0, 2, 0, NULL); if (IS_ERR(hw)) { diff --git a/drivers/gpu/drm/msm/dsi/pll/dsi_pll_28nm.c b/drivers/gpu/drm/msm/dsi/pll/dsi_pll_28nm.c index 8c99e01ae332..6dffd7f4a99b 100644 --- a/drivers/gpu/drm/msm/dsi/pll/dsi_pll_28nm.c +++ b/drivers/gpu/drm/msm/dsi/pll/dsi_pll_28nm.c @@ -554,9 +554,9 @@ static int pll_28nm_register(struct dsi_pll_28nm *pll_28nm) snprintf(parent1, 32, "dsi%dvco_clk", pll_28nm->id); snprintf(parent2, 32, "dsi%dindirect_path_div2_clk", pll_28nm->id); clks[num++] = clk_register_mux(dev, clk_name, - (const char *[]){ + ((const char *[]){ parent1, parent2 - }, 2, CLK_SET_RATE_PARENT, pll_28nm->mmio + + }), 2, CLK_SET_RATE_PARENT, pll_28nm->mmio + REG_DSI_28nm_PHY_PLL_VREG_CFG, 1, 1, 0, NULL); snprintf(clk_name, 32, "dsi%dpllbyte", pll_28nm->id); diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h index 89ca2c42763b..cffa8dfaebf6 100644 --- a/include/linux/clk-provider.h +++ b/include/linux/clk-provider.h @@ -645,28 +645,48 @@ struct clk_mux { extern const struct clk_ops clk_mux_ops; extern const struct clk_ops clk_mux_ro_ops; -struct clk *clk_register_mux(struct device *dev, const char *name, - const char * const *parent_names, u8 num_parents, - unsigned long flags, - void __iomem *reg, u8 shift, u8 width, - u8 clk_mux_flags, spinlock_t *lock); -struct clk_hw *clk_hw_register_mux(struct device *dev, const char *name, - const char * const *parent_names, u8 num_parents, - unsigned long flags, - void __iomem *reg, u8 shift, u8 width, - u8 clk_mux_flags, spinlock_t *lock); - -struct clk *clk_register_mux_table(struct device *dev, const char *name, - const char * const *parent_names, u8 num_parents, - unsigned long flags, - void __iomem *reg, u8 shift, u32 mask, +struct clk_hw *__clk_hw_register_mux(struct device *dev, struct device_node *np, + const char *name, u8 num_parents, + const char * const *parent_names, + const struct clk_hw **parent_hws, + const struct clk_parent_data *parent_data, + unsigned long flags, void __iomem *reg, u8 shift, u32 mask, u8 clk_mux_flags, u32 *table, spinlock_t *lock); -struct clk_hw *clk_hw_register_mux_table(struct device *dev, const char *name, +struct clk *clk_register_mux_table(struct device *dev, const char *name, const char * const *parent_names, u8 num_parents, - unsigned long flags, - void __iomem *reg, u8 shift, u32 mask, + unsigned long flags, void __iomem *reg, u8 shift, u32 mask, u8 clk_mux_flags, u32 *table, spinlock_t *lock); +#define clk_register_mux(dev, name, parent_names, num_parents, flags, reg, \ + shift, width, clk_mux_flags, lock) \ + clk_register_mux_table((dev), (name), (parent_names), (num_parents), \ + (flags), (reg), (shift), BIT((width)) - 1, \ + (clk_mux_flags), NULL, (lock)) +#define clk_hw_register_mux_table(dev, name, parent_names, num_parents, \ + flags, reg, shift, mask, clk_mux_flags, \ + table, lock) \ + __clk_hw_register_mux((dev), NULL, (name), (num_parents), \ + (parent_names), NULL, NULL, (flags), (reg), \ + (shift), (mask), (clk_mux_flags), (table), \ + (lock)) +#define clk_hw_register_mux(dev, name, parent_names, num_parents, flags, reg, \ + shift, width, clk_mux_flags, lock) \ + __clk_hw_register_mux((dev), NULL, (name), (num_parents), \ + (parent_names), NULL, NULL, (flags), (reg), \ + (shift), BIT((width)) - 1, (clk_mux_flags), \ + NULL, (lock)) +#define clk_hw_register_mux_hws(dev, name, parent_hws, num_parents, flags, \ + reg, shift, width, clk_mux_flags, lock) \ + __clk_hw_register_mux((dev), NULL, (name), (num_parents), NULL, \ + (parent_hws), NULL, (flags), (reg), (shift), \ + BIT((width)) - 1, (clk_mux_flags), NULL, (lock)) +#define clk_hw_register_mux_parent_data(dev, name, parent_data, num_parents, \ + flags, reg, shift, width, \ + clk_mux_flags, lock) \ + __clk_hw_register_mux((dev), NULL, (name), (num_parents), NULL, NULL, \ + (parent_data), (flags), (reg), (shift), \ + BIT((width)) - 1, (clk_mux_flags), NULL, (lock)) + int clk_mux_val_to_index(struct clk_hw *hw, u32 *table, unsigned int flags, unsigned int val); unsigned int clk_mux_index_to_val(u32 *table, unsigned int flags, u8 index); -- cgit v1.2.3 From 194efb6e2667cc226fa92a6a4ab5d2298b5b85d9 Mon Sep 17 00:00:00 2001 From: Stephen Boyd Date: Fri, 30 Aug 2019 08:09:22 -0700 Subject: clk: gate: Add support for specifying parents via DT/pointers After commit fc0c209c147f ("clk: Allow parents to be specified without string names") we can use DT or direct clk_hw pointers to specify parents. Create a generic function that shouldn't be used very often to encode the multitude of ways of registering a gate clk with different parent information. Then add a bunch of wrapper macros that only pass down what needs to be passed down to the generic function to support this with less arguments. Cc: Manivannan Sadhasivam Signed-off-by: Stephen Boyd Link: https://lkml.kernel.org/r/20190830150923.259497-12-sboyd@kernel.org --- drivers/clk/clk-gate.c | 35 +++++++++++++------------- include/linux/clk-provider.h | 59 +++++++++++++++++++++++++++++++++++++++++--- 2 files changed, 74 insertions(+), 20 deletions(-) (limited to 'include/linux') diff --git a/drivers/clk/clk-gate.c b/drivers/clk/clk-gate.c index 670053c58c1a..2ca1f2ac38a6 100644 --- a/drivers/clk/clk-gate.c +++ b/drivers/clk/clk-gate.c @@ -123,26 +123,18 @@ const struct clk_ops clk_gate_ops = { }; EXPORT_SYMBOL_GPL(clk_gate_ops); -/** - * clk_hw_register_gate - register a gate clock with the clock framework - * @dev: device that is registering this clock - * @name: name of this clock - * @parent_name: name of this clock's parent - * @flags: framework-specific flags for this clock - * @reg: register address to control gating of this clock - * @bit_idx: which bit in the register controls gating of this clock - * @clk_gate_flags: gate-specific flags for this clock - * @lock: shared register lock for this clock - */ -struct clk_hw *clk_hw_register_gate(struct device *dev, const char *name, - const char *parent_name, unsigned long flags, +struct clk_hw *__clk_hw_register_gate(struct device *dev, + struct device_node *np, const char *name, + const char *parent_name, const struct clk_hw *parent_hw, + const struct clk_parent_data *parent_data, + unsigned long flags, void __iomem *reg, u8 bit_idx, u8 clk_gate_flags, spinlock_t *lock) { struct clk_gate *gate; struct clk_hw *hw; struct clk_init_data init = {}; - int ret; + int ret = -EINVAL; if (clk_gate_flags & CLK_GATE_HIWORD_MASK) { if (bit_idx > 15) { @@ -160,7 +152,12 @@ struct clk_hw *clk_hw_register_gate(struct device *dev, const char *name, init.ops = &clk_gate_ops; init.flags = flags; init.parent_names = parent_name ? &parent_name : NULL; - init.num_parents = parent_name ? 1 : 0; + init.parent_hws = parent_hw ? &parent_hw : NULL; + init.parent_data = parent_data; + if (parent_name || parent_hw || parent_data) + init.num_parents = 1; + else + init.num_parents = 0; /* struct clk_gate assignments */ gate->reg = reg; @@ -170,15 +167,19 @@ struct clk_hw *clk_hw_register_gate(struct device *dev, const char *name, gate->hw.init = &init; hw = &gate->hw; - ret = clk_hw_register(dev, hw); + if (dev || !np) + ret = clk_hw_register(dev, hw); + else if (np) + ret = of_clk_hw_register(np, hw); if (ret) { kfree(gate); hw = ERR_PTR(ret); } return hw; + } -EXPORT_SYMBOL_GPL(clk_hw_register_gate); +EXPORT_SYMBOL_GPL(__clk_hw_register_gate); struct clk *clk_register_gate(struct device *dev, const char *name, const char *parent_name, unsigned long flags, diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h index cffa8dfaebf6..152aeb5aa006 100644 --- a/include/linux/clk-provider.h +++ b/include/linux/clk-provider.h @@ -476,14 +476,67 @@ struct clk_gate { #define CLK_GATE_BIG_ENDIAN BIT(2) extern const struct clk_ops clk_gate_ops; -struct clk *clk_register_gate(struct device *dev, const char *name, - const char *parent_name, unsigned long flags, +struct clk_hw *__clk_hw_register_gate(struct device *dev, + struct device_node *np, const char *name, + const char *parent_name, const struct clk_hw *parent_hw, + const struct clk_parent_data *parent_data, + unsigned long flags, void __iomem *reg, u8 bit_idx, u8 clk_gate_flags, spinlock_t *lock); -struct clk_hw *clk_hw_register_gate(struct device *dev, const char *name, +struct clk *clk_register_gate(struct device *dev, const char *name, const char *parent_name, unsigned long flags, void __iomem *reg, u8 bit_idx, u8 clk_gate_flags, spinlock_t *lock); +/** + * clk_hw_register_gate - register a gate clock with the clock framework + * @dev: device that is registering this clock + * @name: name of this clock + * @parent_name: name of this clock's parent + * @flags: framework-specific flags for this clock + * @reg: register address to control gating of this clock + * @bit_idx: which bit in the register controls gating of this clock + * @clk_gate_flags: gate-specific flags for this clock + * @lock: shared register lock for this clock + */ +#define clk_hw_register_gate(dev, name, parent_name, flags, reg, bit_idx, \ + clk_gate_flags, lock) \ + __clk_hw_register_gate((dev), NULL, (name), (parent_name), NULL, \ + NULL, (flags), (reg), (bit_idx), \ + (clk_gate_flags), (lock)) +/** + * clk_hw_register_gate_parent_hw - register a gate clock with the clock + * framework + * @dev: device that is registering this clock + * @name: name of this clock + * @parent_hw: pointer to parent clk + * @flags: framework-specific flags for this clock + * @reg: register address to control gating of this clock + * @bit_idx: which bit in the register controls gating of this clock + * @clk_gate_flags: gate-specific flags for this clock + * @lock: shared register lock for this clock + */ +#define clk_hw_register_gate_parent_hw(dev, name, parent_name, flags, reg, \ + bit_idx, clk_gate_flags, lock) \ + __clk_hw_register_gate((dev), NULL, (name), (parent_name), NULL, \ + NULL, (flags), (reg), (bit_idx), \ + (clk_gate_flags), (lock)) +/** + * clk_hw_register_gate_parent_data - register a gate clock with the clock + * framework + * @dev: device that is registering this clock + * @name: name of this clock + * @parent_data: parent clk data + * @flags: framework-specific flags for this clock + * @reg: register address to control gating of this clock + * @bit_idx: which bit in the register controls gating of this clock + * @clk_gate_flags: gate-specific flags for this clock + * @lock: shared register lock for this clock + */ +#define clk_hw_register_gate_parent_data(dev, name, parent_name, flags, reg, \ + bit_idx, clk_gate_flags, lock) \ + __clk_hw_register_gate((dev), NULL, (name), (parent_name), NULL, \ + NULL, (flags), (reg), (bit_idx), \ + (clk_gate_flags), (lock)) void clk_unregister_gate(struct clk *clk); void clk_hw_unregister_gate(struct clk_hw *hw); int clk_gate_is_enabled(struct clk_hw *hw); -- cgit v1.2.3 From 64c76b31774db5a0c0ce8df13aef618912136e32 Mon Sep 17 00:00:00 2001 From: Martin Blumenstingl Date: Thu, 26 Dec 2019 20:12:24 +0100 Subject: clk: clarify that clk_set_rate() does updates from top to bottom clk_set_rate() currently starts updating the rate for a clock at the top-most affected clock and then walks down the tree to update the bottom-most affected clock last. This behavior is important for protected clocks where we can switch between multiple parents to achieve the same output. An example for this is the mali clock tree on Amlogic SoCs: mali_0_mux (must not change when enabled) mali_0_div (must not change when enabled) mali_0 (gate) mali_1_mux (must not change when enabled) mali_1_div (must not change when enabled) mali_1 (gate) The final output can either use mali_0_gate or mali_1. To change the final output we must switch to the "inactive" tree. Assuming mali_0 is active, then we need to prepare mali_1 with the new desired rate and finally switch the output to the mali_1 tree. This process will then protect the mali_1 tree and at the same time unprotect the mali_0 tree. The next call to clk_set_rate() will then switch from the mali_1 tree back to mali_0. Acked-by: Stephen Boyd Signed-off-by: Martin Blumenstingl Signed-off-by: Jerome Brunet --- include/linux/clk.h | 3 +++ 1 file changed, 3 insertions(+) (limited to 'include/linux') diff --git a/include/linux/clk.h b/include/linux/clk.h index 18b7b95a8253..7fd6a1febcf4 100644 --- a/include/linux/clk.h +++ b/include/linux/clk.h @@ -627,6 +627,9 @@ long clk_round_rate(struct clk *clk, unsigned long rate); * @clk: clock source * @rate: desired clock rate in Hz * + * Updating the rate starts at the top-most affected clock and then + * walks the tree down to the bottom-most clock that needs updating. + * * Returns success (0) or negative errno. */ int clk_set_rate(struct clk *clk, unsigned long rate); -- cgit v1.2.3 From ff258817137a9004e2fbee2b36df58a4fc7d0f7e Mon Sep 17 00:00:00 2001 From: Stephen Boyd Date: Fri, 30 Aug 2019 08:09:23 -0700 Subject: clk: divider: Add support for specifying parents via DT/pointers After commit fc0c209c147f ("clk: Allow parents to be specified without string names") we can use DT or direct clk_hw pointers to specify parents. Create a generic function that shouldn't be used very often to encode the multitude of ways of registering a divider clk with different parent information. Then add a bunch of wrapper macros that only pass down what needs to be passed down to the generic function to support this with less arguments. Cc: Manivannan Sadhasivam Signed-off-by: Stephen Boyd Link: https://lkml.kernel.org/r/20190830150923.259497-13-sboyd@kernel.org [sboyd@kernel.org: Export __clk_hw_register_divider] --- drivers/clk/clk-divider.c | 91 +++---------------------- include/linux/clk-provider.h | 155 +++++++++++++++++++++++++++++++++++++++---- 2 files changed, 152 insertions(+), 94 deletions(-) (limited to 'include/linux') diff --git a/drivers/clk/clk-divider.c b/drivers/clk/clk-divider.c index 098b2b01f0af..8de12cb0c43d 100644 --- a/drivers/clk/clk-divider.c +++ b/drivers/clk/clk-divider.c @@ -463,11 +463,12 @@ const struct clk_ops clk_divider_ro_ops = { }; EXPORT_SYMBOL_GPL(clk_divider_ro_ops); -static struct clk_hw *_register_divider(struct device *dev, const char *name, - const char *parent_name, unsigned long flags, - void __iomem *reg, u8 shift, u8 width, - u8 clk_divider_flags, const struct clk_div_table *table, - spinlock_t *lock) +struct clk_hw *__clk_hw_register_divider(struct device *dev, + struct device_node *np, const char *name, + const char *parent_name, const struct clk_hw *parent_hw, + const struct clk_parent_data *parent_data, unsigned long flags, + void __iomem *reg, u8 shift, u8 width, u8 clk_divider_flags, + const struct clk_div_table *table, spinlock_t *lock) { struct clk_divider *div; struct clk_hw *hw; @@ -514,55 +515,7 @@ static struct clk_hw *_register_divider(struct device *dev, const char *name, return hw; } - -/** - * clk_register_divider - register a divider clock with the clock framework - * @dev: device registering this clock - * @name: name of this clock - * @parent_name: name of clock's parent - * @flags: framework-specific flags - * @reg: register address to adjust divider - * @shift: number of bits to shift the bitfield - * @width: width of the bitfield - * @clk_divider_flags: divider-specific flags for this clock - * @lock: shared register lock for this clock - */ -struct clk *clk_register_divider(struct device *dev, const char *name, - const char *parent_name, unsigned long flags, - void __iomem *reg, u8 shift, u8 width, - u8 clk_divider_flags, spinlock_t *lock) -{ - struct clk_hw *hw; - - hw = _register_divider(dev, name, parent_name, flags, reg, shift, - width, clk_divider_flags, NULL, lock); - if (IS_ERR(hw)) - return ERR_CAST(hw); - return hw->clk; -} -EXPORT_SYMBOL_GPL(clk_register_divider); - -/** - * clk_hw_register_divider - register a divider clock with the clock framework - * @dev: device registering this clock - * @name: name of this clock - * @parent_name: name of clock's parent - * @flags: framework-specific flags - * @reg: register address to adjust divider - * @shift: number of bits to shift the bitfield - * @width: width of the bitfield - * @clk_divider_flags: divider-specific flags for this clock - * @lock: shared register lock for this clock - */ -struct clk_hw *clk_hw_register_divider(struct device *dev, const char *name, - const char *parent_name, unsigned long flags, - void __iomem *reg, u8 shift, u8 width, - u8 clk_divider_flags, spinlock_t *lock) -{ - return _register_divider(dev, name, parent_name, flags, reg, shift, - width, clk_divider_flags, NULL, lock); -} -EXPORT_SYMBOL_GPL(clk_hw_register_divider); +EXPORT_SYMBOL_GPL(__clk_hw_register_divider); /** * clk_register_divider_table - register a table based divider clock with @@ -586,39 +539,15 @@ struct clk *clk_register_divider_table(struct device *dev, const char *name, { struct clk_hw *hw; - hw = _register_divider(dev, name, parent_name, flags, reg, shift, - width, clk_divider_flags, table, lock); + hw = __clk_hw_register_divider(dev, NULL, name, parent_name, NULL, + NULL, flags, reg, shift, width, clk_divider_flags, + table, lock); if (IS_ERR(hw)) return ERR_CAST(hw); return hw->clk; } EXPORT_SYMBOL_GPL(clk_register_divider_table); -/** - * clk_hw_register_divider_table - register a table based divider clock with - * the clock framework - * @dev: device registering this clock - * @name: name of this clock - * @parent_name: name of clock's parent - * @flags: framework-specific flags - * @reg: register address to adjust divider - * @shift: number of bits to shift the bitfield - * @width: width of the bitfield - * @clk_divider_flags: divider-specific flags for this clock - * @table: array of divider/value pairs ending with a div set to 0 - * @lock: shared register lock for this clock - */ -struct clk_hw *clk_hw_register_divider_table(struct device *dev, - const char *name, const char *parent_name, unsigned long flags, - void __iomem *reg, u8 shift, u8 width, - u8 clk_divider_flags, const struct clk_div_table *table, - spinlock_t *lock) -{ - return _register_divider(dev, name, parent_name, flags, reg, shift, - width, clk_divider_flags, table, lock); -} -EXPORT_SYMBOL_GPL(clk_hw_register_divider_table); - void clk_unregister_divider(struct clk *clk) { struct clk_divider *div; diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h index 152aeb5aa006..be0d22d86590 100644 --- a/include/linux/clk-provider.h +++ b/include/linux/clk-provider.h @@ -626,24 +626,153 @@ int divider_get_val(unsigned long rate, unsigned long parent_rate, const struct clk_div_table *table, u8 width, unsigned long flags); -struct clk *clk_register_divider(struct device *dev, const char *name, - const char *parent_name, unsigned long flags, - void __iomem *reg, u8 shift, u8 width, - u8 clk_divider_flags, spinlock_t *lock); -struct clk_hw *clk_hw_register_divider(struct device *dev, const char *name, - const char *parent_name, unsigned long flags, - void __iomem *reg, u8 shift, u8 width, - u8 clk_divider_flags, spinlock_t *lock); +struct clk_hw *__clk_hw_register_divider(struct device *dev, + struct device_node *np, const char *name, + const char *parent_name, const struct clk_hw *parent_hw, + const struct clk_parent_data *parent_data, unsigned long flags, + void __iomem *reg, u8 shift, u8 width, u8 clk_divider_flags, + const struct clk_div_table *table, spinlock_t *lock); struct clk *clk_register_divider_table(struct device *dev, const char *name, const char *parent_name, unsigned long flags, void __iomem *reg, u8 shift, u8 width, u8 clk_divider_flags, const struct clk_div_table *table, spinlock_t *lock); -struct clk_hw *clk_hw_register_divider_table(struct device *dev, - const char *name, const char *parent_name, unsigned long flags, - void __iomem *reg, u8 shift, u8 width, - u8 clk_divider_flags, const struct clk_div_table *table, - spinlock_t *lock); +/** + * clk_register_divider - register a divider clock with the clock framework + * @dev: device registering this clock + * @name: name of this clock + * @parent_name: name of clock's parent + * @flags: framework-specific flags + * @reg: register address to adjust divider + * @shift: number of bits to shift the bitfield + * @width: width of the bitfield + * @clk_divider_flags: divider-specific flags for this clock + * @lock: shared register lock for this clock + */ +#define clk_register_divider(dev, name, parent_name, flags, reg, shift, width, \ + clk_divider_flags, lock) \ + clk_register_divider_table((dev), (name), (parent_name), (flags), \ + (reg), (shift), (width), \ + (clk_divider_flags), NULL, (lock)) +/** + * clk_hw_register_divider - register a divider clock with the clock framework + * @dev: device registering this clock + * @name: name of this clock + * @parent_name: name of clock's parent + * @flags: framework-specific flags + * @reg: register address to adjust divider + * @shift: number of bits to shift the bitfield + * @width: width of the bitfield + * @clk_divider_flags: divider-specific flags for this clock + * @lock: shared register lock for this clock + */ +#define clk_hw_register_divider(dev, name, parent_name, flags, reg, shift, \ + width, clk_divider_flags, lock) \ + __clk_hw_register_divider((dev), NULL, (name), (parent_name), NULL, \ + NULL, (flags), (reg), (shift), (width), \ + (clk_divider_flags), NULL, (lock)) +/** + * clk_hw_register_divider_parent_hw - register a divider clock with the clock + * framework + * @dev: device registering this clock + * @name: name of this clock + * @parent_hw: pointer to parent clk + * @flags: framework-specific flags + * @reg: register address to adjust divider + * @shift: number of bits to shift the bitfield + * @width: width of the bitfield + * @clk_divider_flags: divider-specific flags for this clock + * @lock: shared register lock for this clock + */ +#define clk_hw_register_divider_parent_hw(dev, name, parent_hw, flags, reg, \ + shift, width, clk_divider_flags, \ + lock) \ + __clk_hw_register_divider((dev), NULL, (name), NULL, (parent_hw), \ + NULL, (flags), (reg), (shift), (width), \ + (clk_divider_flags), NULL, (lock)) +/** + * clk_hw_register_divider_parent_data - register a divider clock with the clock + * framework + * @dev: device registering this clock + * @name: name of this clock + * @parent_data: parent clk data + * @flags: framework-specific flags + * @reg: register address to adjust divider + * @shift: number of bits to shift the bitfield + * @width: width of the bitfield + * @clk_divider_flags: divider-specific flags for this clock + * @lock: shared register lock for this clock + */ +#define clk_hw_register_divider_parent_data(dev, name, parent_data, flags, \ + reg, shift, width, \ + clk_divider_flags, lock) \ + __clk_hw_register_divider((dev), NULL, (name), NULL, NULL, \ + (parent_data), (flags), (reg), (shift), \ + (width), (clk_divider_flags), NULL, (lock)) +/** + * clk_hw_register_divider_table - register a table based divider clock with + * the clock framework + * @dev: device registering this clock + * @name: name of this clock + * @parent_name: name of clock's parent + * @flags: framework-specific flags + * @reg: register address to adjust divider + * @shift: number of bits to shift the bitfield + * @width: width of the bitfield + * @clk_divider_flags: divider-specific flags for this clock + * @table: array of divider/value pairs ending with a div set to 0 + * @lock: shared register lock for this clock + */ +#define clk_hw_register_divider_table(dev, name, parent_name, flags, reg, \ + shift, width, clk_divider_flags, table, \ + lock) \ + __clk_hw_register_divider((dev), NULL, (name), (parent_name), NULL, \ + NULL, (flags), (reg), (shift), (width), \ + (clk_divider_flags), (table), (lock)) +/** + * clk_hw_register_divider_table_parent_hw - register a table based divider + * clock with the clock framework + * @dev: device registering this clock + * @name: name of this clock + * @parent_hw: pointer to parent clk + * @flags: framework-specific flags + * @reg: register address to adjust divider + * @shift: number of bits to shift the bitfield + * @width: width of the bitfield + * @clk_divider_flags: divider-specific flags for this clock + * @table: array of divider/value pairs ending with a div set to 0 + * @lock: shared register lock for this clock + */ +#define clk_hw_register_divider_table_parent_hw(dev, name, parent_hw, flags, \ + reg, shift, width, \ + clk_divider_flags, table, \ + lock) \ + __clk_hw_register_divider((dev), NULL, (name), NULL, (parent_hw), \ + NULL, (flags), (reg), (shift), (width), \ + (clk_divider_flags), (table), (lock)) +/** + * clk_hw_register_divider_table_parent_data - register a table based divider + * clock with the clock framework + * @dev: device registering this clock + * @name: name of this clock + * @parent_data: parent clk data + * @flags: framework-specific flags + * @reg: register address to adjust divider + * @shift: number of bits to shift the bitfield + * @width: width of the bitfield + * @clk_divider_flags: divider-specific flags for this clock + * @table: array of divider/value pairs ending with a div set to 0 + * @lock: shared register lock for this clock + */ +#define clk_hw_register_divider_table_parent_data(dev, name, parent_data, \ + flags, reg, shift, width, \ + clk_divider_flags, table, \ + lock) \ + __clk_hw_register_divider((dev), NULL, (name), NULL, NULL, \ + (parent_data), (flags), (reg), (shift), \ + (width), (clk_divider_flags), (table), \ + (lock)) + void clk_unregister_divider(struct clk *clk); void clk_hw_unregister_divider(struct clk_hw *hw); -- cgit v1.2.3 From df2a4d94f1720e24643a9870a01a1c2895d13b20 Mon Sep 17 00:00:00 2001 From: Rajan Vaja Date: Wed, 4 Dec 2019 22:35:56 -0800 Subject: clk: zynqmp: Warn user if clock user are more than allowed Warn user if clock is used by more than allowed devices. This check is done by firmware and returns respective error code. Upon receiving error code for excessive user, warn user for the same. This change is done to restrict VPLL use count. It is assumed that VPLL is used by one user only. Signed-off-by: Michal Simek Signed-off-by: Rajan Vaja Link: https://lkml.kernel.org/r/1575527759-26452-4-git-send-email-rajan.vaja@xilinx.com Acked-by: Michal Simek Signed-off-by: Stephen Boyd --- drivers/clk/zynqmp/pll.c | 6 ++++-- drivers/firmware/xilinx/zynqmp.c | 2 ++ include/linux/firmware/xlnx-zynqmp.h | 1 + 3 files changed, 7 insertions(+), 2 deletions(-) (limited to 'include/linux') diff --git a/drivers/clk/zynqmp/pll.c b/drivers/clk/zynqmp/pll.c index a541397a172c..89b599530105 100644 --- a/drivers/clk/zynqmp/pll.c +++ b/drivers/clk/zynqmp/pll.c @@ -188,10 +188,12 @@ static int zynqmp_pll_set_rate(struct clk_hw *hw, unsigned long rate, frac = (parent_rate * f) / FRAC_DIV; ret = eemi_ops->clock_setdivider(clk_id, m); - if (ret) + if (ret == -EUSERS) + WARN(1, "More than allowed devices are using the %s, which is forbidden\n", + clk_name); + else if (ret) pr_warn_once("%s() set divider failed for %s, ret = %d\n", __func__, clk_name, ret); - eemi_ops->ioctl(0, IOCTL_SET_PLL_FRAC_DATA, clk_id, f, NULL); return rate + frac; diff --git a/drivers/firmware/xilinx/zynqmp.c b/drivers/firmware/xilinx/zynqmp.c index 75bdfaa08380..74d9f13d72c4 100644 --- a/drivers/firmware/xilinx/zynqmp.c +++ b/drivers/firmware/xilinx/zynqmp.c @@ -48,6 +48,8 @@ static int zynqmp_pm_ret_code(u32 ret_status) return -EACCES; case XST_PM_ABORT_SUSPEND: return -ECANCELED; + case XST_PM_MULT_USER: + return -EUSERS; case XST_PM_INTERNAL: case XST_PM_CONFLICT: case XST_PM_INVALID_NODE: diff --git a/include/linux/firmware/xlnx-zynqmp.h b/include/linux/firmware/xlnx-zynqmp.h index e41ad9e37136..1827d30e86f1 100644 --- a/include/linux/firmware/xlnx-zynqmp.h +++ b/include/linux/firmware/xlnx-zynqmp.h @@ -89,6 +89,7 @@ enum pm_ret_status { XST_PM_INVALID_NODE, XST_PM_DOUBLE_REQ, XST_PM_ABORT_SUSPEND, + XST_PM_MULT_USER = 2008, }; enum pm_ioctl_id { -- cgit v1.2.3 From e942171bbb762977afaa1eb24a312c3bd56386a5 Mon Sep 17 00:00:00 2001 From: Rajan Vaja Date: Wed, 4 Dec 2019 22:35:57 -0800 Subject: clk: zynqmp: Add support for get max divider To achieve best possible rate, maximum limit of divider is required while computation. Get maximum supported divisor from firmware. To maintain backward compatibility assign maximum possible value(0xFFFF) if query for max divisor is not successful. Signed-off-by: Rajan Vaja Link: https://lkml.kernel.org/r/1575527759-26452-5-git-send-email-rajan.vaja@xilinx.com Acked-by: Michal Simek [sboyd@kernel.org: Remove else return and just return] Signed-off-by: Stephen Boyd --- drivers/clk/zynqmp/divider.c | 36 ++++++++++++++++++++++++++++++++++++ include/linux/firmware/xlnx-zynqmp.h | 1 + 2 files changed, 37 insertions(+) (limited to 'include/linux') diff --git a/drivers/clk/zynqmp/divider.c b/drivers/clk/zynqmp/divider.c index d8f5b70d2709..da6903197fc7 100644 --- a/drivers/clk/zynqmp/divider.c +++ b/drivers/clk/zynqmp/divider.c @@ -41,6 +41,7 @@ struct zynqmp_clk_divider { bool is_frac; u32 clk_id; u32 div_type; + u16 max_div; }; static inline int zynqmp_divider_get_val(unsigned long parent_rate, @@ -175,6 +176,35 @@ static const struct clk_ops zynqmp_clk_divider_ops = { .set_rate = zynqmp_clk_divider_set_rate, }; +/** + * zynqmp_clk_get_max_divisor() - Get maximum supported divisor from firmware. + * @clk_id: Id of clock + * @type: Divider type + * + * Return: Maximum divisor of a clock if query data is successful + * U16_MAX in case of query data is not success + */ +u32 zynqmp_clk_get_max_divisor(u32 clk_id, u32 type) +{ + const struct zynqmp_eemi_ops *eemi_ops = zynqmp_pm_get_eemi_ops(); + struct zynqmp_pm_query_data qdata = {0}; + u32 ret_payload[PAYLOAD_ARG_CNT]; + int ret; + + qdata.qid = PM_QID_CLOCK_GET_MAX_DIVISOR; + qdata.arg1 = clk_id; + qdata.arg2 = type; + ret = eemi_ops->query_data(qdata, ret_payload); + /* + * To maintain backward compatibility return maximum possible value + * (0xFFFF) if query for max divisor is not successful. + */ + if (ret) + return U16_MAX; + + return ret_payload[1]; +} + /** * zynqmp_clk_register_divider() - Register a divider clock * @name: Name of this clock @@ -215,6 +245,12 @@ struct clk_hw *zynqmp_clk_register_divider(const char *name, div->clk_id = clk_id; div->div_type = nodes->type; + /* + * To achieve best possible rate, maximum limit of divider is required + * while computation. + */ + div->max_div = zynqmp_clk_get_max_divisor(clk_id, nodes->type); + hw = &div->hw; ret = clk_hw_register(NULL, hw); if (ret) { diff --git a/include/linux/firmware/xlnx-zynqmp.h b/include/linux/firmware/xlnx-zynqmp.h index 1827d30e86f1..1b9549d02544 100644 --- a/include/linux/firmware/xlnx-zynqmp.h +++ b/include/linux/firmware/xlnx-zynqmp.h @@ -108,6 +108,7 @@ enum pm_query_id { PM_QID_CLOCK_GET_PARENTS, PM_QID_CLOCK_GET_ATTRIBUTES, PM_QID_CLOCK_GET_NUM_CLOCKS = 12, + PM_QID_CLOCK_GET_MAX_DIVISOR, }; enum zynqmp_pm_reset_action { -- cgit v1.2.3 From 73ef657275c01928c30c8cec5878834d44af9685 Mon Sep 17 00:00:00 2001 From: Michael Walle Date: Fri, 3 Jan 2020 00:10:59 +0100 Subject: clk: composite: add _register_composite_pdata() variants Add support for the new way of specifying the clock parents. Add the two new functions clk_hw_register_composite_pdata() clk_register_composite_pdata() to let the driver provide parent_data instead of the parent_names. Signed-off-by: Michael Walle Link: https://lkml.kernel.org/r/20200102231101.11834-1-michael@walle.cc Signed-off-by: Stephen Boyd --- drivers/clk/clk-composite.c | 56 +++++++++++++++++++++++++++++++++++++++++--- include/linux/clk-provider.h | 13 ++++++++++ 2 files changed, 66 insertions(+), 3 deletions(-) (limited to 'include/linux') diff --git a/drivers/clk/clk-composite.c b/drivers/clk/clk-composite.c index 3e9c3e608769..7376f573bfdb 100644 --- a/drivers/clk/clk-composite.c +++ b/drivers/clk/clk-composite.c @@ -199,8 +199,9 @@ static void clk_composite_disable(struct clk_hw *hw) gate_ops->disable(gate_hw); } -struct clk_hw *clk_hw_register_composite(struct device *dev, const char *name, - const char * const *parent_names, int num_parents, +static struct clk_hw *__clk_hw_register_composite(struct device *dev, + const char *name, const char * const *parent_names, + const struct clk_parent_data *pdata, int num_parents, struct clk_hw *mux_hw, const struct clk_ops *mux_ops, struct clk_hw *rate_hw, const struct clk_ops *rate_ops, struct clk_hw *gate_hw, const struct clk_ops *gate_ops, @@ -218,7 +219,10 @@ struct clk_hw *clk_hw_register_composite(struct device *dev, const char *name, init.name = name; init.flags = flags; - init.parent_names = parent_names; + if (parent_names) + init.parent_names = parent_names; + else + init.parent_data = pdata; init.num_parents = num_parents; hw = &composite->hw; @@ -312,6 +316,34 @@ err: return hw; } +struct clk_hw *clk_hw_register_composite(struct device *dev, const char *name, + const char * const *parent_names, int num_parents, + struct clk_hw *mux_hw, const struct clk_ops *mux_ops, + struct clk_hw *rate_hw, const struct clk_ops *rate_ops, + struct clk_hw *gate_hw, const struct clk_ops *gate_ops, + unsigned long flags) +{ + return __clk_hw_register_composite(dev, name, parent_names, NULL, + num_parents, mux_hw, mux_ops, + rate_hw, rate_ops, gate_hw, + gate_ops, flags); +} + +struct clk_hw *clk_hw_register_composite_pdata(struct device *dev, + const char *name, + const struct clk_parent_data *parent_data, + int num_parents, + struct clk_hw *mux_hw, const struct clk_ops *mux_ops, + struct clk_hw *rate_hw, const struct clk_ops *rate_ops, + struct clk_hw *gate_hw, const struct clk_ops *gate_ops, + unsigned long flags) +{ + return __clk_hw_register_composite(dev, name, NULL, parent_data, + num_parents, mux_hw, mux_ops, + rate_hw, rate_ops, gate_hw, + gate_ops, flags); +} + struct clk *clk_register_composite(struct device *dev, const char *name, const char * const *parent_names, int num_parents, struct clk_hw *mux_hw, const struct clk_ops *mux_ops, @@ -329,6 +361,24 @@ struct clk *clk_register_composite(struct device *dev, const char *name, return hw->clk; } +struct clk *clk_register_composite_pdata(struct device *dev, const char *name, + const struct clk_parent_data *parent_data, + int num_parents, + struct clk_hw *mux_hw, const struct clk_ops *mux_ops, + struct clk_hw *rate_hw, const struct clk_ops *rate_ops, + struct clk_hw *gate_hw, const struct clk_ops *gate_ops, + unsigned long flags) +{ + struct clk_hw *hw; + + hw = clk_hw_register_composite_pdata(dev, name, parent_data, + num_parents, mux_hw, mux_ops, rate_hw, rate_ops, + gate_hw, gate_ops, flags); + if (IS_ERR(hw)) + return ERR_CAST(hw); + return hw->clk; +} + void clk_unregister_composite(struct clk *clk) { struct clk_composite *composite; diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h index caf4b9df16eb..e2e9d867df36 100644 --- a/include/linux/clk-provider.h +++ b/include/linux/clk-provider.h @@ -743,6 +743,12 @@ struct clk *clk_register_composite(struct device *dev, const char *name, struct clk_hw *rate_hw, const struct clk_ops *rate_ops, struct clk_hw *gate_hw, const struct clk_ops *gate_ops, unsigned long flags); +struct clk *clk_register_composite_pdata(struct device *dev, const char *name, + const struct clk_parent_data *parent_data, int num_parents, + struct clk_hw *mux_hw, const struct clk_ops *mux_ops, + struct clk_hw *rate_hw, const struct clk_ops *rate_ops, + struct clk_hw *gate_hw, const struct clk_ops *gate_ops, + unsigned long flags); void clk_unregister_composite(struct clk *clk); struct clk_hw *clk_hw_register_composite(struct device *dev, const char *name, const char * const *parent_names, int num_parents, @@ -750,6 +756,13 @@ struct clk_hw *clk_hw_register_composite(struct device *dev, const char *name, struct clk_hw *rate_hw, const struct clk_ops *rate_ops, struct clk_hw *gate_hw, const struct clk_ops *gate_ops, unsigned long flags); +struct clk_hw *clk_hw_register_composite_pdata(struct device *dev, + const char *name, + const struct clk_parent_data *parent_data, int num_parents, + struct clk_hw *mux_hw, const struct clk_ops *mux_ops, + struct clk_hw *rate_hw, const struct clk_ops *rate_ops, + struct clk_hw *gate_hw, const struct clk_ops *gate_ops, + unsigned long flags); void clk_hw_unregister_composite(struct clk_hw *hw); /** -- cgit v1.2.3