pinctrl: check pinctrl ready for gpio range

#include <linux/pinctrl/consumer.h>

#include <linux/pinctrl/pinctrl.h>

#include <linux/pinctrl/machine.h>

#include <asm-generic/gpio.h>

#include "core.h"

#include "devicetree.h"

#include "pinmux.h"

	return NULL;

}

/**

 * pinctrl_ready_for_gpio_range() - check if other GPIO pins of

 * the same GPIO chip are in range

 * @gpio: gpio pin to check taken from the global GPIO pin space

 *

 * This function is complement of pinctrl_match_gpio_range(). If the return

 * value of pinctrl_match_gpio_range() is NULL, this function could be used

 * to check whether pinctrl device is ready or not. Maybe some GPIO pins

 * of the same GPIO chip don't have back-end pinctrl interface.

 * If the return value is true, it means that pinctrl device is ready & the

 * certain GPIO pin doesn't have back-end pinctrl device. If the return value

 * is false, it means that pinctrl device may not be ready.

 */

static bool pinctrl_ready_for_gpio_range(unsigned gpio)

{

	struct pinctrl_dev *pctldev;

	struct pinctrl_gpio_range *range = NULL;

	struct gpio_chip *chip = gpio_to_chip(gpio);

	/* Loop over the pin controllers */

	list_for_each_entry(pctldev, &pinctrldev_list, node) {

		/* Loop over the ranges */

		list_for_each_entry(range, &pctldev->gpio_ranges, node) {

			/* Check if any gpio range overlapped with gpio chip */

			if (range->base + range->npins - 1 < chip->base ||

			    range->base > chip->base + chip->ngpio - 1)

				continue;

			return true;

		}

	}

	return false;

}

/**

 * pinctrl_get_device_gpio_range() - find device for GPIO range

 * @gpio: the pin to locate the pin controller for

	ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range);

	if (ret) {

		if (pinctrl_ready_for_gpio_range(gpio))

			ret = 0;

		mutex_unlock(&pinctrl_mutex);

		return ret;

	}