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Commit 27a49ed1 authored by Charles Keepax's avatar Charles Keepax Committed by Linus Walleij
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gpio: arizona: Add support for GPIOs that need to be maintained 



The Arizona devices only maintain the state of output GPIOs whilst the
CODEC is active, this can cause issues if the CODEC suspends whilst
something is relying on the state of one of its GPIOs. However, in
many systems the CODEC GPIOs are used for audio related features
and thus the state of the GPIOs is unimportant whilst the CODEC is
suspended. Often keeping the CODEC resumed in such a system would
incur a power impact that is unacceptable.

Allow the user to select whether a GPIO output should keep the
CODEC resumed, by adding a flag through the second cell of the GPIO
specifier in device tree.

Signed-off-by: default avatarCharles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
parent 05f479bf

drivers/gpio/gpio-arizona.c

+33 −2
Original line number Diff line number Diff line
@@ -33,9 +33,23 @@ static int arizona_gpio_direction_in(struct gpio_chip *chip, unsigned offset) 
{

	struct arizona_gpio *arizona_gpio = gpiochip_get_data(chip);

	struct arizona *arizona = arizona_gpio->arizona;

	bool persistent = gpiochip_line_is_persistent(chip, offset);

	bool change;

	int ret;



	return regmap_update_bits(arizona->regmap, ARIZONA_GPIO1_CTRL + offset,

				  ARIZONA_GPN_DIR, ARIZONA_GPN_DIR);

	ret = regmap_update_bits_check(arizona->regmap,

				       ARIZONA_GPIO1_CTRL + offset,

				       ARIZONA_GPN_DIR, ARIZONA_GPN_DIR,

				       &change);

	if (ret < 0)

		return ret;



	if (change && persistent) {

		pm_runtime_mark_last_busy(chip->parent);

		pm_runtime_put_autosuspend(chip->parent);

	}



	return 0;

}



static int arizona_gpio_get(struct gpio_chip *chip, unsigned offset)
@@ -85,6 +99,21 @@ static int arizona_gpio_direction_out(struct gpio_chip *chip, 
{

	struct arizona_gpio *arizona_gpio = gpiochip_get_data(chip);

	struct arizona *arizona = arizona_gpio->arizona;

	bool persistent = gpiochip_line_is_persistent(chip, offset);

	unsigned int val;

	int ret;



	ret = regmap_read(arizona->regmap, ARIZONA_GPIO1_CTRL + offset, &val);

	if (ret < 0)

		return ret;



	if ((val & ARIZONA_GPN_DIR) && persistent) {

		ret = pm_runtime_get_sync(chip->parent);

		if (ret < 0) {

			dev_err(chip->parent, "Failed to resume: %d\n", ret);

			return ret;

		}

	}



	if (value)

		value = ARIZONA_GPN_LVL;
@@ -158,6 +187,8 @@ static int arizona_gpio_probe(struct platform_device *pdev) 
	else

		arizona_gpio->gpio_chip.base = -1;



	pm_runtime_enable(&pdev->dev);



	ret = devm_gpiochip_add_data(&pdev->dev, &arizona_gpio->gpio_chip,

				     arizona_gpio);

	if (ret < 0) {