From 27a49ed17e2245cacbdea88ad78b8494653e0338 Mon Sep 17 00:00:00 2001 From: Charles Keepax Date: Tue, 23 May 2017 15:47:30 +0100 Subject: [PATCH] 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: Charles Keepax Signed-off-by: Linus Walleij --- drivers/gpio/gpio-arizona.c | 35 +++++++++++++++++++++++++++++++++-- 1 file changed, 33 insertions(+), 2 deletions(-) diff --git a/drivers/gpio/gpio-arizona.c b/drivers/gpio/gpio-arizona.c index cd23fd727f95..d4e6ba0301bc 100644 --- a/drivers/gpio/gpio-arizona.c +++ b/drivers/gpio/gpio-arizona.c @@ -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) { -- 2.20.1