linux-kernel - [PATCH v2 2/2] dt-bindings: leds: Read max-brightness from devicetree

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Date:   Fri, 30 Jun 2023 11:22:47 +0200
From:   Astrid Rost <astrid.rost@...s.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh@...nel.org>,
        "Jacek Anaszewski" <jacek.anaszewski@...il.com>,
        Pavel Machek <pavel@....cz>, "Lee Jones" <lee@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>
CC:     <kernel@...s.com>, Astrid Rost <astrid.rost@...s.com>,
        <linux-leds@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH v2 2/2] dt-bindings: leds: Read max-brightness from devicetree

Add max-brightness in order to reduce the current on the connected LEDs.
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 led-max-microamp should be preferably used, if it
is supported by the controller.

Signed-off-by: Astrid Rost <astrid.rost@...s.com>
---
 Documentation/devicetree/bindings/leds/common.yaml | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/Documentation/devicetree/bindings/leds/common.yaml b/Documentation/devicetree/bindings/leds/common.yaml
index 11aedf1650a1..603a5630fc3d 100644
--- a/Documentation/devicetree/bindings/leds/common.yaml
+++ b/Documentation/devicetree/bindings/leds/common.yaml
@@ -160,6 +160,16 @@ 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 led-max-microamp should be preferably used,
+      if it is supported by the controller.
+    $ref: /schemas/types.yaml#definitions/uint32
+
   panic-indicator:
     description:
       This property specifies that the LED should be used, if at all possible,
-- 
2.30.2