dt-bindings: display: vop2: Add optional PLL clock property for rk3576

commit 3832dc4 upstream.

As with the RK3588 SoC, RK3576 also allows the use of HDMI PHY PLL as an
alternative and more accurate pixel clock source for VOP2.

Document the optional PLL clock property.

Moreover, given that this is part of a series intended to address some
recent display problems, provide the appropriate tags to facilitate
backporting.

Fixes: c3b7c5a ("dt-bindings: display: vop2: Add rk3576 support")
Cc: stable@vger.kernel.org
Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@collabora.com>
Reviewed-by: "Rob Herring (Arm)" <robh@kernel.org>
Tested-by: Nicolas Frattaroli <nicolas.frattaroli@collabora.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Link: https://lore.kernel.org/r/20250612-rk3576-hdmitx-fix-v1-1-4b11007d8675@collabora.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: cristicc

Documentation/devicetree/bindings/display/rockchip/rockchip-vop2.yaml

@@ -64,10 +64,10 @@ properties:
       - description: Pixel clock for video port 0.
       - description: Pixel clock for video port 1.
       - description: Pixel clock for video port 2.
-      - description: Pixel clock for video port 3.
-      - description: Peripheral(vop grf/dsi) clock.
-      - description: Alternative pixel clock provided by HDMI0 PHY PLL.
-      - description: Alternative pixel clock provided by HDMI1 PHY PLL.
+      - {}
+      - {}
+      - {}
+      - {}
 
   clock-names:
     minItems: 5
@@ -77,10 +77,10 @@ properties:
       - const: dclk_vp0
       - const: dclk_vp1
       - const: dclk_vp2
-      - const: dclk_vp3
-      - const: pclk_vop
-      - const: pll_hdmiphy0
-      - const: pll_hdmiphy1
+      - {}
+      - {}
+      - {}
+      - {}
 
   rockchip,grf:
     $ref: /schemas/types.yaml#/definitions/phandle
@@ -175,10 +175,24 @@ allOf:
     then:
       properties:
         clocks:
-          maxItems: 5
+          minItems: 5
+          items:
+            - {}
+            - {}
+            - {}
+            - {}
+            - {}
+            - description: Alternative pixel clock provided by HDMI PHY PLL.
 
         clock-names:
-          maxItems: 5
+          minItems: 5
+          items:
+            - {}
+            - {}
+            - {}
+            - {}
+            - {}
+            - const: pll_hdmiphy0
 
         interrupts:
           minItems: 4
@@ -208,11 +222,29 @@ allOf:
       properties:
         clocks:
           minItems: 7
-          maxItems: 9
+          items:
+            - {}
+            - {}
+            - {}
+            - {}
+            - {}
+            - description: Pixel clock for video port 3.
+            - description: Peripheral(vop grf/dsi) clock.
+            - description: Alternative pixel clock provided by HDMI0 PHY PLL.
+            - description: Alternative pixel clock provided by HDMI1 PHY PLL.
 
         clock-names:
           minItems: 7
-          maxItems: 9
+          items:
+            - {}
+            - {}
+            - {}
+            - {}
+            - {}
+            - const: dclk_vp3
+            - const: pclk_vop
+            - const: pll_hdmiphy0
+            - const: pll_hdmiphy1
 
         interrupts:
           maxItems: 1