diff options
| author | Linus Walleij <linus.walleij@linaro.org> | 2012-11-20 14:25:07 +0100 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2012-11-21 08:55:12 +0100 |
| commit | 9afbefb227792a3c195085d662050dcca748f521 (patch) | |
| tree | 6ca22f39a4d97a73b2fb37472af596c159210ea7 | |
| parent | 8f23ca1a73a096f21e6618d8e23df613daa5e532 (diff) | |
pinctrl: add function to retrieve range from pin
This adds a function to the pinctrl core to retrieve the GPIO
range associated with a certain pin for a certain controller.
This is needed when a pinctrl driver want to look up the
corresponding struct gpio_chip for a certain pin. As the
GPIO drivers can now create these ranges themselves, the
pinctrl driver no longer knows about all its associated GPIO
chips.
Reviewed-by: Stephen Warren <swarren@nvidia.com>
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
| -rw-r--r-- | drivers/pinctrl/core.c | 24 | ||||
| -rw-r--r-- | include/linux/pinctrl/pinctrl.h | 3 |
2 files changed, 27 insertions, 0 deletions
diff --git a/drivers/pinctrl/core.c b/drivers/pinctrl/core.c index 33af811a6a3c..5cdee8669ea3 100644 --- a/drivers/pinctrl/core.c +++ b/drivers/pinctrl/core.c @@ -364,6 +364,30 @@ struct pinctrl_dev *pinctrl_find_and_add_gpio_range(const char *devname, EXPORT_SYMBOL_GPL(pinctrl_find_and_add_gpio_range); /** + * pinctrl_find_gpio_range_from_pin() - locate the GPIO range for a pin + * @pctldev: the pin controller device to look in + * @pin: a controller-local number to find the range for + */ +struct pinctrl_gpio_range * +pinctrl_find_gpio_range_from_pin(struct pinctrl_dev *pctldev, + unsigned int pin) +{ + struct pinctrl_gpio_range *range = NULL; + + /* Loop over the ranges */ + list_for_each_entry(range, &pctldev->gpio_ranges, node) { + /* Check if we're in the valid range */ + if (pin >= range->pin_base && + pin < range->pin_base + range->npins) { + return range; + } + } + + return NULL; +} +EXPORT_SYMBOL_GPL(pinctrl_find_gpio_range_from_pin); + +/** * pinctrl_remove_gpio_range() - remove a range of GPIOs fro a pin controller * @pctldev: pin controller device to remove the range from * @range: the GPIO range to remove diff --git a/include/linux/pinctrl/pinctrl.h b/include/linux/pinctrl/pinctrl.h index 7dee9acbd271..04d6700d99af 100644 --- a/include/linux/pinctrl/pinctrl.h +++ b/include/linux/pinctrl/pinctrl.h @@ -139,6 +139,9 @@ extern void pinctrl_remove_gpio_range(struct pinctrl_dev *pctldev, extern struct pinctrl_dev *pinctrl_find_and_add_gpio_range(const char *devname, struct pinctrl_gpio_range *range); +extern struct pinctrl_gpio_range * +pinctrl_find_gpio_range_from_pin(struct pinctrl_dev *pctldev, + unsigned int pin); #ifdef CONFIG_OF extern struct pinctrl_dev *of_pinctrl_get(struct device_node *np); |