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

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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>
This commit is contained in:
Astrid Rost 2023-07-03 15:03:12 +02:00 committed by Lee Jones
parent 7a72f33b67
commit 713899c062
1 changed files with 12 additions and 0 deletions
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12
Documentation/devicetree/bindings/leds/common.yaml
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@ -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,