dt-bindings: display: rcar-du: Add a VSP channel index to the vsps DT property

On some R-Car SoCs a single VSP can serve multiple DU channels through
multiple LIF instances in the VSP. The current DT bindings don't support
specifying that kind of SoC integration scheme. Extend them with a VSP
channel index.

Backward compatibility can be ensured in drivers by checking the length
of the vsps property and setting the channel to 0 when the property
doesn't contain channel indices.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

Documentation/devicetree/bindings/display/renesas,du.txt

@@ -36,8 +36,10 @@ Required Properties:
       When supplied they must be named "dclkin.x" with "x" being the input
       clock numerical index.
 
-  - vsps: A list of phandles to the VSP nodes that handle the memory
-    interfaces for the DU channels.
+  - vsps: A list of phandle and channel index tuples to the VSPs that handle
+    the memory interfaces for the DU channels. The phandle identifies the VSP
+    instance that serves the DU channel, and the channel index identifies the
+    LIF instance in that VSP.
 
 Required nodes:
 
@@ -59,24 +61,24 @@ corresponding to each DU output.
  R8A7796 (M3-W)	DPAD		HDMI		LVDS		-
 
 
-Example: R8A7790 (R-Car H2) DU
+Example: R8A7795 (R-Car H3) ES2.0 DU
 
-	du: du@feb00000 {
-		compatible = "renesas,du-r8a7790";
-		reg = <0 0xfeb00000 0 0x70000>,
-		      <0 0xfeb90000 0 0x1c>,
-		      <0 0xfeb94000 0 0x1c>;
-		reg-names = "du", "lvds.0", "lvds.1";
-		interrupt-parent = <&gic>;
-		interrupts = <0 256 IRQ_TYPE_LEVEL_HIGH>,
-			     <0 268 IRQ_TYPE_LEVEL_HIGH>,
-			     <0 269 IRQ_TYPE_LEVEL_HIGH>;
-		clocks = <&mstp7_clks R8A7790_CLK_DU0>,
-		         <&mstp7_clks R8A7790_CLK_DU1>,
-		         <&mstp7_clks R8A7790_CLK_DU2>,
-		         <&mstp7_clks R8A7790_CLK_LVDS0>,
-		         <&mstp7_clks R8A7790_CLK_LVDS1>;
-		clock-names = "du.0", "du.1", "du.2", "lvds.0", "lvds.1";
+	du: display@feb00000 {
+		compatible = "renesas,du-r8a7795";
+		reg = <0 0xfeb00000 0 0x80000>,
+		      <0 0xfeb90000 0 0x14>;
+		reg-names = "du", "lvds.0";
+		interrupts = <GIC_SPI 256 IRQ_TYPE_LEVEL_HIGH>,
+			     <GIC_SPI 268 IRQ_TYPE_LEVEL_HIGH>,
+			     <GIC_SPI 269 IRQ_TYPE_LEVEL_HIGH>,
+			     <GIC_SPI 270 IRQ_TYPE_LEVEL_HIGH>;
+		clocks = <&cpg CPG_MOD 724>,
+			 <&cpg CPG_MOD 723>,
+			 <&cpg CPG_MOD 722>,
+			 <&cpg CPG_MOD 721>,
+			 <&cpg CPG_MOD 727>;
+		clock-names = "du.0", "du.1", "du.2", "du.3", "lvds.0";
+		vsps = <&vspd0 0>, <&vspd1 0>, <&vspd2 0>, <&vspd0 1>;
 
 		ports {
 			#address-cells = <1>;
@@ -89,12 +91,19 @@ Example: R8A7790 (R-Car H2) DU
 			};
 			port@1 {
 				reg = <1>;
-				du_out_lvds0: endpoint {
+				du_out_hdmi0: endpoint {
+					remote-endpoint = <&dw_hdmi0_in>;
 				};
 			};
 			port@2 {
 				reg = <2>;
-				du_out_lvds1: endpoint {
+				du_out_hdmi1: endpoint {
+					remote-endpoint = <&dw_hdmi1_in>;
+				};
+			};
+			port@3 {
+				reg = <3>;
+				du_out_lvds0: endpoint {
 				};
 			};
 		};