This adds the ability to define the initial state of each output line on device probe. Signed-off-by: David Bauer <mail@xxxxxxxxxxxxxxx> --- Documentation/devicetree/bindings/gpio/gpio-74x164.txt | 5 +++++ drivers/gpio/gpio-74x164.c | 3 +++ 2 files changed, 8 insertions(+) diff --git a/Documentation/devicetree/bindings/gpio/gpio-74x164.txt b/Documentation/devicetree/bindings/gpio/gpio-74x164.txt index 2a97553d8d76..580b18065ad3 100644 --- a/Documentation/devicetree/bindings/gpio/gpio-74x164.txt +++ b/Documentation/devicetree/bindings/gpio/gpio-74x164.txt @@ -14,6 +14,11 @@ Required properties: Optional properties: - enable-gpios: GPIO connected to the OE (Output Enable) pin. +- lines-initial-states: Bitmask that specifies the initial state of + each line. When a bit is set to zero, the corresponding output line + is initialized LOW. When a bit is set to one, the corresponding + output line is initialized HIGH. In case this property is not + defined, all lines will be initialized as LOW. Example: diff --git a/drivers/gpio/gpio-74x164.c b/drivers/gpio/gpio-74x164.c index fb7b620763a2..275310a0a538 100644 --- a/drivers/gpio/gpio-74x164.c +++ b/drivers/gpio/gpio-74x164.c @@ -150,6 +150,9 @@ static int gen_74x164_probe(struct spi_device *spi) chip->gpio_chip.parent = &spi->dev; chip->gpio_chip.owner = THIS_MODULE; + of_property_read_u8_array(spi->dev.of_node, "lines-initial-states", + chip->buffer, chip->registers); + mutex_init(&chip->lock); ret = __gen_74x164_write_config(chip); -- 2.18.0
