[PATCH v2 2/8] dt-bindings: leds: pca995x: Describe nxp,output-gain property

[Nora Schiffer]

Allow configuring the output current to adjust for different hardware
designs.

The output gain relates the output current with an external resistor
connected to the LED driver. It does not directly correspond to a
meaningful physical unit of measurement, so we refer to the datasheet
for information on its calculation.

Signed-off-by: Nora Schiffer <nora.schiffer@xxxxxxxxxxxxxxx>
---

v2:
- Add nxp, vendor prefix
- Fix default value to match existing driver code
- Describe retionale for using register value directly in commit message

 Documentation/devicetree/bindings/leds/nxp,pca995x.yaml | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Documentation/devicetree/bindings/leds/nxp,pca995x.yaml b/Documentation/devicetree/bindings/leds/nxp,pca995x.yaml
index 201f32f1b8139..372ecd18043e0 100644
--- a/Documentation/devicetree/bindings/leds/nxp,pca995x.yaml
+++ b/Documentation/devicetree/bindings/leds/nxp,pca995x.yaml
@@ -39,6 +39,14 @@ properties:
   reset-gpios:
     maxItems: 1
 
+  nxp,output-gain:
+    description:
+      Set the output gain controlling the LED current as described in the
+      PCA995x datasheets.
+    $ref: /schemas/types.yaml#/definitions/uint32
+    default: 127
+    maximum: 255
+
 patternProperties:
   "^led@[0-9a-f]+$":
     type: object
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