The MangoPi M28K is a dual-gigabit SBC developed by Widora based
on the RK3528 SoC. Add devicetree binding documentation for it.

Signed-off-by: Chukun Pan <amadeus@jmu.edu.cn>
---
 Documentation/devicetree/bindings/arm/rockchip.yaml | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Documentation/devicetree/bindings/arm/rockchip.yaml b/Documentation/devicetree/bindings/arm/rockchip.yaml
index 8d6e2b28e51a..8fef370b637c 100644
--- a/Documentation/devicetree/bindings/arm/rockchip.yaml
+++ b/Documentation/devicetree/bindings/arm/rockchip.yaml
@@ -1269,6 +1269,11 @@ properties:
           - const: turing,rk1
           - const: rockchip,rk3588
 
+      - description: MangoPi M28K
+        items:
+          - const: widora,mangopi-m28k
+          - const: rockchip,rk3528
+
       - description: WolfVision PF5 mainboard
         items:
           - const: wolfvision,rk3568-pf5
-- 
2.25.1