dt-bindings: display: convert Arm Mali-DP to DT schema

The Arm Mali Display Processor (DP) 5xx/6xx is a series of IP that scans
out a framebuffer and hands the pixels over to a digital signal encoder.
It supports multiple layers, scaling and rotation.

Convert the existing DT binding to DT schema.
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220506140533.3566431-11-andre.przywara@arm.com

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

-ARM Mali-DP
-
-The following bindings apply to a family of Display Processors sold as
-licensable IP by ARM Ltd. The bindings describe the Mali DP500, DP550 and
-DP650 processors that offer multiple composition layers, support for
-rotation and scaling output.
-
-Required properties:
-  - compatible: should be one of
-	"arm,mali-dp500"
-	"arm,mali-dp550"
-	"arm,mali-dp650"
-    depending on the particular implementation present in the hardware
-  - reg: Physical base address and size of the block of registers used by
-    the processor.
-  - interrupts: Interrupt list, as defined in ../interrupt-controller/interrupts.txt,
-    interrupt client nodes.
-  - interrupt-names: name of the engine inside the processor that will
-    use the corresponding interrupt. Should be one of "DE" or "SE".
-  - clocks: A list of phandle + clock-specifier pairs, one for each entry
-    in 'clock-names'
-  - clock-names: A list of clock names. It should contain:
-      - "pclk": for the APB interface clock
-      - "aclk": for the AXI interface clock
-      - "mclk": for the main processor clock
-      - "pxlclk": for the pixel clock feeding the output PLL of the processor.
-  - arm,malidp-output-port-lines: Array of u8 values describing the number
-    of output lines per channel (R, G and B).
-
-Required sub-nodes:
-  - port: The Mali DP connection to an encoder input port. The connection
-    is modelled using the OF graph bindings specified in
-    Documentation/devicetree/bindings/graph.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 memory.
-  - arm,malidp-arqos-high-level: integer of u32 value describing the ARQoS
-    levels of DP500's QoS signaling.
-
-
-Example:
-
-/ {
-	...
-
-	dp0: malidp@6f200000 {
-		compatible = "arm,mali-dp650";
-		reg = <0 0x6f200000 0 0x20000>;
-		memory-region = <&display_reserved>;
-		interrupts = <0 168 IRQ_TYPE_LEVEL_HIGH>,
-			     <0 168 IRQ_TYPE_LEVEL_HIGH>;
-		interrupt-names = "DE", "SE";
-		clocks = <&oscclk2>, <&fpgaosc0>, <&fpgaosc1>, <&fpgaosc1>;
-		clock-names = "pxlclk", "mclk", "aclk", "pclk";
-		arm,malidp-output-port-lines = /bits/ 8 <8 8 8>;
-		arm,malidp-arqos-high-level = <0xd000d000>;
-		port {
-			dp0_output: endpoint {
-				remote-endpoint = <&tda998x_2_input>;
-			};
-		};
-	};
-
-	...
-};

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

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/arm,malidp.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Arm Mali Display Processor (Mali-DP) binding
+
+maintainers:
+  - Liviu Dudau <Liviu.Dudau@arm.com>
+  - Andre Przywara <andre.przywara@arm.com>
+
+description:
+  The following bindings apply to a family of Display Processors sold as
+  licensable IP by ARM Ltd. The bindings describe the Mali DP500, DP550 and
+  DP650 processors that offer multiple composition layers, support for
+  rotation and scaling output.
+
+properties:
+  compatible:
+    enum:
+      - arm,mali-dp500
+      - arm,mali-dp550
+      - arm,mali-dp650
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    items:
+      - description:
+          The interrupt used by the Display Engine (DE). Can be shared with
+          the interrupt for the Scaling Engine (SE), but it will have to be
+          listed individually.
+      - description:
+          The interrupt used by the Scaling Engine (SE). Can be shared with
+          the interrupt for the Display Engine (DE), but it will have to be
+          listed individually.
+
+  interrupt-names:
+    items:
+      - const: DE
+      - const: SE
+
+  clock-names:
+    items:
+      - const: pxlclk
+      - const: mclk
+      - const: aclk
+      - const: pclk
+
+  clocks:
+    items:
+      - description: the pixel clock feeding the output PLL of the processor
+      - description: the main processor clock
+      - description: the AXI interface clock
+      - description: the APB interface clock
+
+  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.
+
+  arm,malidp-output-port-lines:
+    $ref: /schemas/types.yaml#/definitions/uint8-array
+    description:
+      Number of output lines/bits for each colour channel.
+    items:
+      - description: number of output lines for the red channel (R)
+      - description: number of output lines for the green channel (G)
+      - description: number of output lines for the blue channel (B)
+
+  arm,malidp-arqos-high-level:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      integer describing the ARQoS levels of DP500's QoS signaling
+
+  arm,malidp-arqos-value:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      Quality-of-Service value for the display engine FIFOs, to write
+      into the RQOS register of the DP500.
+      See the ARM Mali-DP500 TRM for details on the encoding.
+      If omitted, the RQOS register will not be changed.
+
+  port:
+    $ref: /schemas/graph.yaml#/properties/port
+    unevaluatedProperties: false
+    description:
+      Output endpoint of the controller, connecting the LCD panel signals.
+
+additionalProperties: false
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - interrupt-names
+  - clocks
+  - clock-names
+  - port
+  - arm,malidp-output-port-lines
+
+examples:
+  - |
+    dp0: malidp@6f200000 {
+        compatible = "arm,mali-dp650";
+        reg = <0x6f200000 0x20000>;
+        memory-region = <&display_reserved>;
+        interrupts = <168>, <168>;
+        interrupt-names = "DE", "SE";
+        clocks = <&oscclk2>, <&fpgaosc0>, <&fpgaosc1>, <&fpgaosc1>;
+        clock-names = "pxlclk", "mclk", "aclk", "pclk";
+        arm,malidp-output-port-lines = /bits/ 8 <8 8 8>;
+        arm,malidp-arqos-high-level = <0xd000d000>;
+
+        port {
+            dp0_output: endpoint {
+                remote-endpoint = <&tda998x_2_input>;
+            };
+        };
+    };
+...