The HINLINK H66K/H68K are 2.5GbE SBC based on the RK3568 SoC.
Add devicetree binding documentation for them.

Signed-off-by: Chukun Pan <amadeus@jmu.edu.cn>
---
 Documentation/devicetree/bindings/arm/rockchip.yaml | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Documentation/devicetree/bindings/arm/rockchip.yaml b/Documentation/devicetree/bindings/arm/rockchip.yaml
index 28db6bd6aa5b..870c318fc8d4 100644
--- a/Documentation/devicetree/bindings/arm/rockchip.yaml
+++ b/Documentation/devicetree/bindings/arm/rockchip.yaml
@@ -683,6 +683,13 @@ properties:
           - const: hardkernel,odroid-m2
           - const: rockchip,rk3588s
 
+      - description: HINLINK H66K / H68K
+        items:
+          - enum:
+              - hinlink,h66k
+              - hinlink,h68k
+          - const: rockchip,rk3568
+
       - description: Hugsun X99 TV Box
         items:
           - const: hugsun,x99
-- 
2.25.1