[PATCH v3 1/2] dt-bindings: Add doc for FriendlyARM NanoPi R4S

[Tianling Shen]

Add devicetree binding documentation for the FriendlyARM NanoPi R4S.

Changes in v2:
- Disable display for NanoPi R4S (reference commit: 74532de460ec)
- Light "sys" LED on NanoPi R4S (reference commit: 833821eeab91)

Changes in v3:
- Dropped non-existent node `display_subsystem`

Signed-off-by: Tianling Shen <cnsztl at gmail.com>
---
 Documentation/devicetree/bindings/arm/rockchip.yaml | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/devicetree/bindings/arm/rockchip.yaml b/Documentation/devicetree/bindings/arm/rockchip.yaml
index c3036f95c7bc..4a6f772c1043 100644
--- a/Documentation/devicetree/bindings/arm/rockchip.yaml
+++ b/Documentation/devicetree/bindings/arm/rockchip.yaml
@@ -134,6 +134,7 @@ properties:
               - friendlyarm,nanopi-m4
               - friendlyarm,nanopi-m4b
               - friendlyarm,nanopi-neo4
+              - friendlyarm,nanopi-r4s
           - const: rockchip,rk3399
 
       - description: GeekBuying GeekBox
-- 
2.17.1