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Commit b0571e7e authored by Russell King's avatar Russell King Committed by Bryan Wu
Browse files

leds: leds-pwm: add DT support for LEDs wired to supply 



The non-DT driver allowed an active low property to be specified, but DT
is missing this in its description.  Add the property to the DT binding
document, making it optional.  It defaults to active high, which retains
compatibility with existing descriptions.

This should only be used for causes where the LED is wired to supply,
and the PWM does not sensibly support its own inversion.

Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: default avatarBryan Wu <cooloney@gmail.com>
parent d19a8a70

Documentation/devicetree/bindings/leds/leds-pwm.txt

+2 −0
Original line number Diff line number Diff line
@@ -13,6 +13,8 @@ LED sub-node properties: 
  For the pwms and pwm-names property please refer to:

  Documentation/devicetree/bindings/pwm/pwm.txt

- max-brightness : Maximum brightness possible for the LED

- active-low : (optional) For PWMs where the LED is wired to supply

  rather than ground.

- label :  (optional)

  see Documentation/devicetree/bindings/leds/common.txt

- linux,default-trigger :  (optional)

drivers/leds/leds-pwm.c

+1 −0
Original line number Diff line number Diff line
@@ -154,6 +154,7 @@ static int led_pwm_create_of(struct device *dev, struct led_pwm_priv *priv) 


		led.default_trigger = of_get_property(child,

						"linux,default-trigger", NULL);

		led.active_low = of_property_read_bool(child, "active-low");

		of_property_read_u32(child, "max-brightness",

				     &led.max_brightness);