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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>
This commit is contained in:
Linus Walleij 2012-11-20 14:25:07 +01:00
parent 8f23ca1a73
commit 9afbefb227
2 changed files with 27 additions and 0 deletions
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24
drivers/pinctrl/core.c
View File

@ -363,6 +363,30 @@ 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

3
include/linux/pinctrl/pinctrl.h
View File

@ -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);