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Commit 9afbefb2 authored by Linus Walleij's avatar Linus Walleij
Browse files

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: default avatarStephen Warren <swarren@nvidia.com>
Reviewed-by: default avatarViresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
parent 8f23ca1a

drivers/pinctrl/core.c

+24 −0
Original line number Diff line number Diff line
@@ -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

include/linux/pinctrl/pinctrl.h

+3 −0
Original line number Diff line number Diff line
@@ -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);