[PATCH 1/2] dt-bindings: backlight: lm3630a: Add led-max-microamp

[Michiel van Beers via B4 Relay <devnull+michielvanbeers.gmail.com@kernel.org>]

From: Michiel van Beers <michielvanbeers@gmail.com>

The LM3630A has a full-scale current setting per control bank, from
5 mA to 28.25 mA in steps of 750 uA. Boards whose LED strings are rated
for less than the chip default of 28.25 mA have no way to describe that
limit.

Add the common led-max-microamp property to the led@0 and led@1 nodes.
The property is optional, so existing devicetrees remain valid.

Signed-off-by: Michiel van Beers <michielvanbeers@gmail.com>
---
 .../devicetree/bindings/leds/backlight/lm3630a-backlight.yaml    | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/Documentation/devicetree/bindings/leds/backlight/lm3630a-backlight.yaml b/Documentation/devicetree/bindings/leds/backlight/lm3630a-backlight.yaml
index 6393cbf3afdf..a031679d5468 100644
--- a/Documentation/devicetree/bindings/leds/backlight/lm3630a-backlight.yaml
+++ b/Documentation/devicetree/bindings/leds/backlight/lm3630a-backlight.yaml
@@ -77,6 +77,14 @@ patternProperties:
         minimum: 0
         maximum: 255
 
+      led-max-microamp:
+        description:
+          Full-scale current of the LED strings driven by this control bank.
+          The LM3630A sets it from 5 mA to 28.25 mA in steps of 750 uA.
+        minimum: 5000
+        maximum: 28250
+        default: 28250
+
       ti,linear-mapping-mode:
         description: |
           Enable linear mapping mode. If disabled, then it will use exponential
@@ -112,6 +120,7 @@ examples:
                 label = "lcd-backlight";
                 default-brightness = <200>;
                 max-brightness = <255>;
+                led-max-microamp = <20000>;
             };
         };
     };

-- 
2.43.0