diff options
| author | Charles Keepax | 2017-05-23 16:47:29 +0200 |
|---|---|---|
| committer | Linus Walleij | 2017-05-29 11:07:55 +0200 |
| commit | 05f479bf7d239f01ff6546f2bdeb14ad0fe65601 (patch) | |
| tree | 01007d9e5d3d3093d50cb01a1c715c142c63d4d1 /drivers/gpio/gpiolib.c | |
| parent | gpio: of: Reflect decoupling of open collector and active low/high (diff) | |
| download | kernel-qcow2-linux-05f479bf7d239f01ff6546f2bdeb14ad0fe65601.tar.gz kernel-qcow2-linux-05f479bf7d239f01ff6546f2bdeb14ad0fe65601.tar.xz kernel-qcow2-linux-05f479bf7d239f01ff6546f2bdeb14ad0fe65601.zip | |
gpio: Add new flags to control sleep status of GPIOs
Add new flags to allow users to specify that they are not concerned with
the status of GPIOs whilst in a sleep/low power state.
Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/gpio/gpiolib.c')
| -rw-r--r-- | drivers/gpio/gpiolib.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index 995ca9cf7dbf..c81c42093ff6 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -2869,6 +2869,16 @@ bool gpiochip_line_is_open_source(struct gpio_chip *chip, unsigned int offset) } EXPORT_SYMBOL_GPL(gpiochip_line_is_open_source); +bool gpiochip_line_is_persistent(struct gpio_chip *chip, unsigned int offset) +{ + if (offset >= chip->ngpio) + return false; + + return !test_bit(FLAG_SLEEP_MAY_LOOSE_VALUE, + &chip->gpiodev->descs[offset].flags); +} +EXPORT_SYMBOL_GPL(gpiochip_line_is_persistent); + /** * gpiod_get_raw_value_cansleep() - return a gpio's raw value * @desc: gpio whose value will be returned @@ -3225,6 +3235,8 @@ static int gpiod_configure_flags(struct gpio_desc *desc, const char *con_id, set_bit(FLAG_OPEN_DRAIN, &desc->flags); if (lflags & GPIO_OPEN_SOURCE) set_bit(FLAG_OPEN_SOURCE, &desc->flags); + if (lflags & GPIO_SLEEP_MAY_LOOSE_VALUE) + set_bit(FLAG_SLEEP_MAY_LOOSE_VALUE, &desc->flags); /* No particular flag request, return here... */ if (!(dflags & GPIOD_FLAGS_BIT_DIR_SET)) { |