diff options
author | Dave Airlie <airlied@redhat.com> | 2015-04-20 04:32:26 +0300 |
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committer | Dave Airlie <airlied@redhat.com> | 2015-04-20 06:05:20 +0300 |
commit | 2c33ce009ca2389dbf0535d0672214d09738e35e (patch) | |
tree | 6186a6458c3c160385d794a23eaf07c786a9e61b /drivers/gpio/gpiolib-of.c | |
parent | cec32a47010647e8b0603726ebb75b990a4057a4 (diff) | |
parent | 09d51602cf84a1264946711dd4ea0dddbac599a1 (diff) | |
download | linux-2c33ce009ca2389dbf0535d0672214d09738e35e.tar.xz |
Merge Linus master into drm-next
The merge is clean, but the arm build fails afterwards,
due to API changes in the regulator tree.
I've included the patch into the merge to fix the build.
Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'drivers/gpio/gpiolib-of.c')
-rw-r--r-- | drivers/gpio/gpiolib-of.c | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c index 4650bf830d6b..a6c67c6b4680 100644 --- a/drivers/gpio/gpiolib-of.c +++ b/drivers/gpio/gpiolib-of.c @@ -22,6 +22,7 @@ #include <linux/of_gpio.h> #include <linux/pinctrl/pinctrl.h> #include <linux/slab.h> +#include <linux/gpio/machine.h> #include "gpiolib.h" @@ -118,6 +119,114 @@ int of_get_named_gpio_flags(struct device_node *np, const char *list_name, EXPORT_SYMBOL(of_get_named_gpio_flags); /** + * of_get_gpio_hog() - Get a GPIO hog descriptor, names and flags for GPIO API + * @np: device node to get GPIO from + * @name: GPIO line name + * @lflags: gpio_lookup_flags - returned from of_find_gpio() or + * of_get_gpio_hog() + * @dflags: gpiod_flags - optional GPIO initialization flags + * + * Returns GPIO descriptor to use with Linux GPIO API, or one of the errno + * value on the error condition. + */ +static struct gpio_desc *of_get_gpio_hog(struct device_node *np, + const char **name, + enum gpio_lookup_flags *lflags, + enum gpiod_flags *dflags) +{ + struct device_node *chip_np; + enum of_gpio_flags xlate_flags; + struct gpio_desc *desc; + struct gg_data gg_data = { + .flags = &xlate_flags, + }; + u32 tmp; + int i, ret; + + chip_np = np->parent; + if (!chip_np) + return ERR_PTR(-EINVAL); + + xlate_flags = 0; + *lflags = 0; + *dflags = 0; + + ret = of_property_read_u32(chip_np, "#gpio-cells", &tmp); + if (ret) + return ERR_PTR(ret); + + if (tmp > MAX_PHANDLE_ARGS) + return ERR_PTR(-EINVAL); + + gg_data.gpiospec.args_count = tmp; + gg_data.gpiospec.np = chip_np; + for (i = 0; i < tmp; i++) { + ret = of_property_read_u32_index(np, "gpios", i, + &gg_data.gpiospec.args[i]); + if (ret) + return ERR_PTR(ret); + } + + gpiochip_find(&gg_data, of_gpiochip_find_and_xlate); + if (!gg_data.out_gpio) { + if (np->parent == np) + return ERR_PTR(-ENXIO); + else + return ERR_PTR(-EINVAL); + } + + if (xlate_flags & OF_GPIO_ACTIVE_LOW) + *lflags |= GPIO_ACTIVE_LOW; + + if (of_property_read_bool(np, "input")) + *dflags |= GPIOD_IN; + else if (of_property_read_bool(np, "output-low")) + *dflags |= GPIOD_OUT_LOW; + else if (of_property_read_bool(np, "output-high")) + *dflags |= GPIOD_OUT_HIGH; + else { + pr_warn("GPIO line %d (%s): no hogging state specified, bailing out\n", + desc_to_gpio(gg_data.out_gpio), np->name); + return ERR_PTR(-EINVAL); + } + + if (name && of_property_read_string(np, "line-name", name)) + *name = np->name; + + desc = gg_data.out_gpio; + + return desc; +} + +/** + * of_gpiochip_scan_hogs - Scan gpio-controller and apply GPIO hog as requested + * @chip: gpio chip to act on + * + * This is only used by of_gpiochip_add to request/set GPIO initial + * configuration. + */ +static void of_gpiochip_scan_hogs(struct gpio_chip *chip) +{ + struct gpio_desc *desc = NULL; + struct device_node *np; + const char *name; + enum gpio_lookup_flags lflags; + enum gpiod_flags dflags; + + for_each_child_of_node(chip->of_node, np) { + if (!of_property_read_bool(np, "gpio-hog")) + continue; + + desc = of_get_gpio_hog(np, &name, &lflags, &dflags); + if (IS_ERR(desc)) + continue; + + if (gpiod_hog(desc, name, lflags, dflags)) + continue; + } +} + +/** * of_gpio_simple_xlate - translate gpio_spec to the GPIO number and flags * @gc: pointer to the gpio_chip structure * @np: device node of the GPIO chip @@ -326,6 +435,8 @@ void of_gpiochip_add(struct gpio_chip *chip) of_gpiochip_add_pin_range(chip); of_node_get(chip->of_node); + + of_gpiochip_scan_hogs(chip); } void of_gpiochip_remove(struct gpio_chip *chip) |