dt-bindings: display: convert PL110/PL111 to DT schema

The Arm PL110 and PL111 are IP blocks that provide a display engine with
an LCD interface, being able to drive a variety of LC panels.

Convert the binding over to DT schema, to the DTs can be automatically
checked.
This still contains the deprecated "arm,pl11x,tft-r0g0b0-pads" property,
because this is used by several DTs in the tree.
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
[robh: make interrupts optional (not connected on Realview EB)]
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220506140533.3566431-9-andre.przywara@arm.com

Documentation/devicetree/bindings/display/arm,pl11x.txt

-* ARM PrimeCell Color LCD Controller PL110/PL111
-
-See also Documentation/devicetree/bindings/arm/primecell.yaml
-
-Required properties:
-
-- compatible: must be one of:
-	"arm,pl110", "arm,primecell"
-	"arm,pl111", "arm,primecell"
-
-- reg: base address and size of the control registers block
-
-- interrupt-names: either the single entry "combined" representing a
-	combined interrupt output (CLCDINTR), or the four entries
-	"mbe", "vcomp", "lnbu", "fuf" representing the individual
-	CLCDMBEINTR, CLCDVCOMPINTR, CLCDLNBUINTR, CLCDFUFINTR interrupts
-
-- interrupts: contains an interrupt specifier for each entry in
-	interrupt-names
-
-- clock-names: should contain "clcdclk" and "apb_pclk"
-
-- clocks: contains phandle and clock specifier pairs for the entries
-	in the clock-names property. See
-	Documentation/devicetree/bindings/clock/clock-bindings.txt
-
-Optional properties:
-
-- memory-region: phandle to a node describing memory (see
-	Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt)
-	to be used for the framebuffer; if not present, the framebuffer
-	may be located anywhere in the memory
-
-- max-memory-bandwidth: maximum bandwidth in bytes per second that the
-	cell's memory interface can handle; if not present, the memory
-	interface is fast enough to handle all possible video modes
-
-Required sub-nodes:
-
-- port: describes LCD panel signals, following the common binding
-	for video transmitter interfaces; see
-	Documentation/devicetree/bindings/media/video-interfaces.txt
-
-Deprecated properties:
-	The port's endbpoint subnode had this, now deprecated property
-	in the past. Drivers should be able to survive without it:
-
-	- arm,pl11x,tft-r0g0b0-pads: an array of three 32-bit values,
-		defining the way CLD pads are wired up; first value
-		contains index of the "CLD" external pin (pad) used
-		as R0 (first bit of the red component), second value
-	        index of the pad used as G0, third value index of the
-		pad used as B0, see also "LCD panel signal multiplexing
-		details" paragraphs in the PL110/PL111 Technical
-		Reference Manuals; this implicitly defines available
-		color modes, for example:
-		- PL111 TFT 4:4:4 panel:
-			arm,pl11x,tft-r0g0b0-pads = <4 15 20>;
-		- PL110 TFT (1:)5:5:5 panel:
-			arm,pl11x,tft-r0g0b0-pads = <1 7 13>;
-		- PL111 TFT (1:)5:5:5 panel:
-			arm,pl11x,tft-r0g0b0-pads = <3 11 19>;
-		- PL111 TFT 5:6:5 panel:
-			arm,pl11x,tft-r0g0b0-pads = <3 10 19>;
-		- PL110 and PL111 TFT 8:8:8 panel:
-			arm,pl11x,tft-r0g0b0-pads = <0 8 16>;
-		- PL110 and PL111 TFT 8:8:8 panel, R & B components swapped:
-			arm,pl11x,tft-r0g0b0-pads = <16 8 0>;
-
-
-Example:
-
-	clcd@10020000 {
-		compatible = "arm,pl111", "arm,primecell";
-		reg = <0x10020000 0x1000>;
-		interrupt-names = "combined";
-		interrupts = <0 44 4>;
-		clocks = <&oscclk1>, <&oscclk2>;
-		clock-names = "clcdclk", "apb_pclk";
-		max-memory-bandwidth = <94371840>; /* Bps, 1024x768@60 16bpp */
-
-		port {
-			clcd_pads: endpoint {
-				remote-endpoint = <&clcd_panel>;
-			};
-		};
-
-	};
-
-	panel {
-		compatible = "panel-dpi";
-
-		port {
-			clcd_panel: endpoint {
-				remote-endpoint = <&clcd_pads>;
-			};
-		};
-
-		panel-timing {
-			clock-frequency = <25175000>;
-			hactive = <640>;
-			hback-porch = <40>;
-			hfront-porch = <24>;
-			hsync-len = <96>;
-			vactive = <480>;
-			vback-porch = <32>;
-			vfront-porch = <11>;
-			vsync-len = <2>;
-		};
-	};

Documentation/devicetree/bindings/display/arm,pl11x.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/arm,pl11x.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Arm PrimeCell Color LCD Controller PL110/PL111
+
+maintainers:
+  - Liviu Dudau <Liviu.Dudau@arm.com>
+  - Andre Przywara <andre.przywara@arm.com>
+
+description:
+  The Arm Primcell PL010/PL111 is an LCD controller IP, than scans out
+  a framebuffer region in system memory, and creates timed signals for
+  a variety of LCD panels.
+
+# We need a select here so we don't match all nodes with 'arm,primecell'
+select:
+  properties:
+    compatible:
+      contains:
+        enum:
+          - arm,pl110
+          - arm,pl111
+  required:
+    - compatible
+
+properties:
+  compatible:
+    items:
+      - enum:
+          - arm,pl110
+          - arm,pl111
+      - const: arm,primecell
+
+  reg:
+    maxItems: 1
+
+  interrupt-names:
+    oneOf:
+      - const: combined
+        description:
+          The IP provides four individual interrupt lines, but also one
+          combined line. If the integration only connects this line to the
+          interrupt controller, this single interrupt is noted here.
+      - items:
+          - const: mbe        # CLCDMBEINTR
+          - const: vcomp      # CLCDVCOMPINTR
+          - const: lnbu       # CLCDLNBUINTR
+          - const: fuf        # CLCDFUFINTR
+
+  interrupts:
+    minItems: 1
+    maxItems: 4
+
+  clock-names:
+    items:
+      - const: clcdclk
+      - const: apb_pclk
+
+  clocks:
+    items:
+      - description: The CLCDCLK reference clock for the controller.
+      - description: The HCLK AHB slave clock for the register access.
+
+  memory-region:
+    maxItems: 1
+    description:
+      Phandle to a node describing memory to be used for the framebuffer.
+      If not present, the framebuffer may be located anywhere in memory.
+
+  max-memory-bandwidth:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      Maximum bandwidth in bytes per second that the cell's memory interface
+      can handle.
+      If not present, the memory interface is fast enough to handle all
+      possible video modes.
+
+  port:
+    $ref: /schemas/graph.yaml#/$defs/port-base
+    additionalProperties: false
+
+    description:
+      Output endpoint of the controller, connecting the LCD panel signals.
+
+    properties:
+      endpoint:
+        $ref: /schemas/graph.yaml#/$defs/endpoint-base
+        unevaluatedProperties: false
+
+        properties:
+          arm,pl11x,tft-r0g0b0-pads:
+            $ref: /schemas/types.yaml#/definitions/uint32-array
+            items:
+              - description: index of CLD pad used for first red bit (R0)
+              - description: index of CLD pad used for first green bit (G0)
+              - description: index of CLD pad used for first blue bit (G0)
+            deprecated: true
+            description: |
+              DEPRECATED. An array of three 32-bit values, defining the way
+              CLD[23:0] pads are wired up.
+              The first value contains the index of the "CLD" external pin (pad)
+              used as R0 (first bit of the red component), the second value for
+              green, the third value for blue.
+              See also "LCD panel signal multiplexing details" paragraphs in the
+              PL110/PL111 Technical Reference Manuals.
+              This implicitly defines available color modes, for example:
+              - PL111 TFT 4:4:4 panel:
+                  arm,pl11x,tft-r0g0b0-pads = <4 15 20>;
+              - PL110 TFT (1:)5:5:5 panel:
+                  arm,pl11x,tft-r0g0b0-pads = <1 7 13>;
+              - PL111 TFT (1:)5:5:5 panel:
+                  arm,pl11x,tft-r0g0b0-pads = <3 11 19>;
+              - PL111 TFT 5:6:5 panel:
+                  arm,pl11x,tft-r0g0b0-pads = <3 10 19>;
+              - PL110 and PL111 TFT 8:8:8 panel:
+                  arm,pl11x,tft-r0g0b0-pads = <0 8 16>;
+              - PL110 and PL111 TFT 8:8:8 panel, R & B components swapped:
+                  arm,pl11x,tft-r0g0b0-pads = <16 8 0>;
+
+additionalProperties: false
+
+required:
+  - compatible
+  - reg
+  - clock-names
+  - clocks
+  - port
+
+allOf:
+  - if:
+      properties:
+        interrupts:
+          minItems: 2
+      required:
+        - interrupts
+    then:
+      required:
+        - interrupt-names
+
+examples:
+  - |
+    clcd@10020000 {
+        compatible = "arm,pl111", "arm,primecell";
+        reg = <0x10020000 0x1000>;
+        interrupt-names = "combined";
+        interrupts = <44>;
+        clocks = <&oscclk1>, <&oscclk2>;
+        clock-names = "clcdclk", "apb_pclk";
+        max-memory-bandwidth = <94371840>; /* Bps, 1024x768@60 16bpp */
+
+        port {
+            clcd_pads: endpoint {
+                remote-endpoint = <&clcd_panel>;
+            };
+        };
+    };
+
+    panel {
+        compatible = "arm,rtsm-display", "panel-dpi";
+        power-supply = <&vcc_supply>;
+
+        port {
+            clcd_panel: endpoint {
+                remote-endpoint = <&clcd_pads>;
+            };
+        };
+
+        panel-timing {
+            clock-frequency = <25175000>;
+            hactive = <640>;
+            hback-porch = <40>;
+            hfront-porch = <24>;
+            hsync-len = <96>;
+            vactive = <480>;
+            vback-porch = <32>;
+            vfront-porch = <11>;
+            vsync-len = <2>;
+        };
+    };
+...