From 9dfdcdfed4726f94fc38d94f29f8214f38058576 Mon Sep 17 00:00:00 2001 From: Igor Grinberg Date: Fri, 8 Nov 2013 01:03:52 +0200 Subject: gpio_led: add support for inverted polarity Some GPIO connected LEDs have inverted polarity. Introduce new config option: CONFIG_GPIO_LED_INVERTED_TABLE for the specifying the inverted GPIO LEDs list and add support for this in the gpio_led driver. Signed-off-by: Igor Grinberg Tested-by: Ilya Ledvich --- README | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'README') diff --git a/README b/README index 7b393b79b3..5def773ff5 100644 --- a/README +++ b/README @@ -1971,6 +1971,13 @@ CBFS (Coreboot Filesystem) support status LED backend implementation. Define CONFIG_GPIO_LED to include the gpio_led driver in the U-Boot binary. + CONFIG_GPIO_LED_INVERTED_TABLE + Some GPIO connected LEDs may have inverted polarity in which + case the GPIO high value corresponds to LED off state and + GPIO low value corresponds to LED on state. + In such cases CONFIG_GPIO_LED_INVERTED_TABLE may be defined + with a list of GPIO LEDs that have inverted polarity. + - CAN Support: CONFIG_CAN_DRIVER Defining CONFIG_CAN_DRIVER enables CAN driver support -- cgit v1.2.1