diff options
Diffstat (limited to 'drivers/clk/keystone')
| -rw-r--r-- | drivers/clk/keystone/Kconfig | 11 | ||||
| -rw-r--r-- | drivers/clk/keystone/sci-clk.c | 130 |
2 files changed, 141 insertions, 0 deletions
diff --git a/drivers/clk/keystone/Kconfig b/drivers/clk/keystone/Kconfig index b04927d06cd1..aaaee7d1c126 100644 --- a/drivers/clk/keystone/Kconfig +++ b/drivers/clk/keystone/Kconfig @@ -14,3 +14,14 @@ config TI_SCI_CLK This adds the clock driver support over TI System Control Interface. If you wish to use clock resources from the PMMC firmware, say Y. Otherwise, say N. + +config TI_SCI_CLK_PROBE_FROM_FW + bool "Probe available clocks from firmware" + depends on TI_SCI_CLK + default n + help + Forces the TI SCI clock driver to probe available clocks from the + firmware. By default, only the used clocks are probed from DT. + This is mostly only useful for debugging purposes, and will + increase the boot time of the device. If you want the clocks probed + from firmware, say Y. Otherwise, say N. diff --git a/drivers/clk/keystone/sci-clk.c b/drivers/clk/keystone/sci-clk.c index 1e465de75e4a..76ed4cc8d826 100644 --- a/drivers/clk/keystone/sci-clk.c +++ b/drivers/clk/keystone/sci-clk.c @@ -23,6 +23,7 @@ #include <linux/slab.h> #include <linux/soc/ti/ti_sci_protocol.h> #include <linux/bsearch.h> +#include <linux/list_sort.h> #define SCI_CLK_SSC_ENABLE BIT(0) #define SCI_CLK_ALLOW_FREQ_CHANGE BIT(1) @@ -52,6 +53,7 @@ struct sci_clk_provider { * @num_parents: Number of parents for this clock * @provider: Master clock provider * @flags: Flags for the clock + * @node: Link for handling clocks probed via DT */ struct sci_clk { struct clk_hw hw; @@ -60,6 +62,7 @@ struct sci_clk { u8 num_parents; struct sci_clk_provider *provider; u8 flags; + struct list_head node; }; #define to_sci_clk(_hw) container_of(_hw, struct sci_clk, hw) @@ -403,6 +406,7 @@ static const struct of_device_id ti_sci_clk_of_match[] = { }; MODULE_DEVICE_TABLE(of, ti_sci_clk_of_match); +#ifdef CONFIG_TI_SCI_CLK_PROBE_FROM_FW static int ti_sci_scan_clocks_from_fw(struct sci_clk_provider *provider) { int ret; @@ -479,6 +483,124 @@ static int ti_sci_scan_clocks_from_fw(struct sci_clk_provider *provider) return 0; } +#else + +static int _cmp_sci_clk_list(void *priv, struct list_head *a, + struct list_head *b) +{ + struct sci_clk *ca = container_of(a, struct sci_clk, node); + struct sci_clk *cb = container_of(b, struct sci_clk, node); + + return _cmp_sci_clk(ca, &cb); +} + +static int ti_sci_scan_clocks_from_dt(struct sci_clk_provider *provider) +{ + struct device *dev = provider->dev; + struct device_node *np = NULL; + int ret; + int index; + struct of_phandle_args args; + struct list_head clks; + struct sci_clk *sci_clk, *prev; + int num_clks = 0; + int num_parents; + int clk_id; + const char * const clk_names[] = { + "clocks", "assigned-clocks", "assigned-clock-parents", NULL + }; + const char * const *clk_name; + + INIT_LIST_HEAD(&clks); + + clk_name = clk_names; + + while (*clk_name) { + np = of_find_node_with_property(np, *clk_name); + if (!np) { + clk_name++; + break; + } + + if (!of_device_is_available(np)) + continue; + + index = 0; + + do { + ret = of_parse_phandle_with_args(np, *clk_name, + "#clock-cells", index, + &args); + if (ret) + break; + + if (args.args_count == 2 && args.np == dev->of_node) { + sci_clk = devm_kzalloc(dev, sizeof(*sci_clk), + GFP_KERNEL); + if (!sci_clk) + return -ENOMEM; + + sci_clk->dev_id = args.args[0]; + sci_clk->clk_id = args.args[1]; + sci_clk->provider = provider; + provider->ops->get_num_parents(provider->sci, + sci_clk->dev_id, + sci_clk->clk_id, + &sci_clk->num_parents); + list_add_tail(&sci_clk->node, &clks); + + num_clks++; + + num_parents = sci_clk->num_parents; + if (num_parents == 1) + num_parents = 0; + + clk_id = args.args[1] + 1; + + while (num_parents--) { + sci_clk = devm_kzalloc(dev, + sizeof(*sci_clk), + GFP_KERNEL); + if (!sci_clk) + return -ENOMEM; + sci_clk->dev_id = args.args[0]; + sci_clk->clk_id = clk_id++; + sci_clk->provider = provider; + list_add_tail(&sci_clk->node, &clks); + + num_clks++; + } + } + + index++; + } while (args.np); + } + + list_sort(NULL, &clks, _cmp_sci_clk_list); + + provider->clocks = devm_kmalloc_array(dev, num_clks, sizeof(sci_clk), + GFP_KERNEL); + if (!provider->clocks) + return -ENOMEM; + + num_clks = 0; + prev = NULL; + + list_for_each_entry(sci_clk, &clks, node) { + if (prev && prev->dev_id == sci_clk->dev_id && + prev->clk_id == sci_clk->clk_id) + continue; + + provider->clocks[num_clks++] = sci_clk; + prev = sci_clk; + } + + provider->num_clocks = num_clks; + + return 0; +} +#endif + /** * ti_sci_clk_probe - Probe function for the TI SCI clock driver * @pdev: platform device pointer to be probed @@ -509,11 +631,19 @@ static int ti_sci_clk_probe(struct platform_device *pdev) provider->ops = &handle->ops.clk_ops; provider->dev = dev; +#ifdef CONFIG_TI_SCI_CLK_PROBE_FROM_FW ret = ti_sci_scan_clocks_from_fw(provider); if (ret) { dev_err(dev, "scan clocks from FW failed: %d\n", ret); return ret; } +#else + ret = ti_sci_scan_clocks_from_dt(provider); + if (ret) { + dev_err(dev, "scan clocks from DT failed: %d\n", ret); + return ret; + } +#endif ret = ti_sci_init_clocks(provider); if (ret) { |