From: Andy Yan <andy....@rock-chips.com>

The clock polarity of RGB signal output is controlled by GRF, this
property is already being used in the current device tree, but
forgot to describe it as a required property in the binding file.

Signed-off-by: Andy Yan <andy....@rock-chips.com>

---

Changes in v13:
- Fix typo
- Explain the function of this property.

Changes in v12:
- Split from patch 10/13

 .../devicetree/bindings/display/rockchip/rockchip-vop2.yaml   | 4 ++++
 1 file changed, 4 insertions(+)

diff --git 
a/Documentation/devicetree/bindings/display/rockchip/rockchip-vop2.yaml 
b/Documentation/devicetree/bindings/display/rockchip/rockchip-vop2.yaml
index 32da1625c063..cf68eb911118 100644
--- a/Documentation/devicetree/bindings/display/rockchip/rockchip-vop2.yaml
+++ b/Documentation/devicetree/bindings/display/rockchip/rockchip-vop2.yaml
@@ -142,6 +142,9 @@ allOf:
         rockchip,vop-grf: false
         rockchip,pmu: false
 
+      required:
+        - rockchip,grf
+
   - if:
       properties:
         compatible:
@@ -196,6 +199,7 @@ examples:
                               "dclk_vp1",
                               "dclk_vp2";
                 power-domains = <&power RK3568_PD_VO>;
+                rockchip,grf = <&grf>;
                 iommus = <&vop_mmu>;
                 vop_out: ports {
                     #address-cells = <1>;
-- 
2.34.1

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