Commit 713899c0 authored Jul 03, 2023 by Astrid Rost Committed by Lee Jones Jul 28, 2023

dt-bindings: leds: Read max-brightness from device tree



Normally, the maximum brightness is determined by the hardware, and this
property is not required. This property is used to set a software limit.
It could happen that an LED is made so bright that it gets damaged or
causes damage due to restrictions in a specific system, such as mounting
conditions.
Note that this flag is mainly used for PWM-LEDs, where it is not possible
to map brightness to current. Drivers for other controllers should use
led-max-microamp.

Signed-off-by: Astrid Rost <astrid.rost@axis.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Acked-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
Link: https://lore.kernel.org/r/20230703130313.548519-2-astrid.rost@axis.com


Signed-off-by: Lee Jones <lee@kernel.org>

parent 7a72f33b

Documentation/devicetree/bindings/leds/common.yaml

+12 −0

Original line number	Diff line number	Diff line
		@@ -158,6 +158,18 @@ properties:
		For flash LED controllers with configurable current this property is
		mandatory for the LEDs in the non-flash modes (e.g. torch or indicator).

		max-brightness:
		description:
		Normally, the maximum brightness is determined by the hardware, and this
		property is not required. This property is used to set a software limit.
		It could happen that an LED is made so bright that it gets damaged or
		causes damage due to restrictions in a specific system, such as mounting
		conditions.
		Note that this flag is mainly used for PWM-LEDs, where it is not possible
		to map brightness to current. Drivers for other controllers should use
		led-max-microamp.
		$ref: /schemas/types.yaml#definitions/uint32

		panic-indicator:
		description:
		This property specifies that the LED should be used, if at all possible,