dt-bindings: Convert Arm Mali Midgard GPU to DT schema

Convert the Arm Midgard GPU binding to DT schema format.

The 'clocks' property is now required. This simplifies the schema as
effectively all the users require 'clocks' already and the upstream
driver requires at least one clock.

Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
Acked-by: Maxime Ripard <maxime.ripard@bootlin.com>
Acked-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/gpu/arm,mali-midgard.yaml

@@ -0,0 +1,165 @@
+# SPDX-License-Identifier: GPL-2.0-only
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/gpu/arm,mali-midgard.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: ARM Mali Midgard GPU
+
+maintainers:
+  - Rob Herring <robh@kernel.org>
+
+properties:
+  $nodename:
+    pattern: '^gpu@[a-f0-9]+$'
+  compatible:
+    oneOf:
+      - items:
+          - enum:
+             - allwinner,sun50i-h6-mali
+          - const: arm,mali-t720
+      - items:
+          - enum:
+             - amlogic,meson-gxm-mali
+          - const: arm,mali-t820
+      - items:
+          - enum:
+             - rockchip,rk3288-mali
+          - const: arm,mali-t760
+      - items:
+          - enum:
+             - rockchip,rk3399-mali
+          - const: arm,mali-t860
+      - items:
+          - enum:
+             - samsung,exynos5433-mali
+          - const: arm,mali-t760
+
+          # "arm,mali-t604"
+          # "arm,mali-t624"
+          # "arm,mali-t628"
+          # "arm,mali-t830"
+          # "arm,mali-t880"
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    items:
+      - description: Job interrupt
+      - description: MMU interrupt
+      - description: GPU interrupt
+
+  interrupt-names:
+    items:
+      - const: job
+      - const: mmu
+      - const: gpu
+
+  clocks:
+    minItems: 1
+    maxItems: 2
+
+  clock-names:
+    minItems: 1
+    items:
+      - const: core
+      - const: bus
+
+  mali-supply:
+    maxItems: 1
+
+  resets:
+    minItems: 1
+    maxItems: 2
+
+  operating-points-v2: true
+
+  "#cooling-cells":
+    const: 2
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - interrupt-names
+  - clocks
+
+allOf:
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: allwinner,sun50i-h6-mali
+    then:
+      properties:
+        clocks:
+          minItems: 2
+      required:
+        - clock-names
+        - resets
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: amlogic,meson-gxm-mali
+    then:
+      properties:
+        resets:
+          minItems: 2
+      required:
+        - resets
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+    gpu@ffa30000 {
+      compatible = "rockchip,rk3288-mali", "arm,mali-t760";
+      reg = <0xffa30000 0x10000>;
+      interrupts = <GIC_SPI 6 IRQ_TYPE_LEVEL_HIGH>,
+             <GIC_SPI 7 IRQ_TYPE_LEVEL_HIGH>,
+             <GIC_SPI 8 IRQ_TYPE_LEVEL_HIGH>;
+      interrupt-names = "job", "mmu", "gpu";
+      clocks = <&cru 0>;
+      mali-supply = <&vdd_gpu>;
+      operating-points-v2 = <&gpu_opp_table>;
+      power-domains = <&power 0>;
+      #cooling-cells = <2>;
+    };
+
+    gpu_opp_table: opp_table0 {
+      compatible = "operating-points-v2";
+
+      opp@533000000 {
+        opp-hz = /bits/ 64 <533000000>;
+        opp-microvolt = <1250000>;
+      };
+      opp@450000000 {
+        opp-hz = /bits/ 64 <450000000>;
+        opp-microvolt = <1150000>;
+      };
+      opp@400000000 {
+        opp-hz = /bits/ 64 <400000000>;
+        opp-microvolt = <1125000>;
+      };
+      opp@350000000 {
+        opp-hz = /bits/ 64 <350000000>;
+        opp-microvolt = <1075000>;
+      };
+      opp@266000000 {
+        opp-hz = /bits/ 64 <266000000>;
+        opp-microvolt = <1025000>;
+      };
+      opp@160000000 {
+        opp-hz = /bits/ 64 <160000000>;
+        opp-microvolt = <925000>;
+      };
+      opp@100000000 {
+        opp-hz = /bits/ 64 <100000000>;
+        opp-microvolt = <912500>;
+      };
+    };
+
+...