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authorIgor Grinberg <grinberg@compulab.co.il>2013-11-08 01:03:52 +0200
committerTom Rini <trini@ti.com>2013-11-25 10:41:52 -0500
commit9dfdcdfed4726f94fc38d94f29f8214f38058576 (patch)
tree7f621f7ada71e5ee3aad125245e52633e938d2e0 /README
parent6516f81b64c71ab2be61f304d0e13dd84f730484 (diff)
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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 <grinberg@compulab.co.il> Tested-by: Ilya Ledvich <ilya@compulab.co.il>
Diffstat (limited to 'README')
-rw-r--r--README7
1 files changed, 7 insertions, 0 deletions
diff --git a/README b/README
index 7b393b7..5def773 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