dt-bindings: clock: Convert img,pistachio-clk to DT schema

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+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/clock/img,pistachio-clk.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Imagination Technologies Pistachio SoC clock controllers
+
+maintainers:
+  - Andrew Bresticker <[email protected]>
+
+description: |
+  Pistachio has four clock controllers (core clock, peripheral clock, peripheral
+  general control, and top general control) which are instantiated individually
+  from the device-tree.
+
+  Core clock controller:
+
+  The core clock controller generates clocks for the CPU, RPU (WiFi + BT
+  co-processor), audio, and several peripherals.
+
+  Peripheral clock controller:
+
+  The peripheral clock controller generates clocks for the DDR, ROM, and other
+  peripherals. The peripheral system clock ("periph_sys") generated by the core
+  clock controller is the input clock to the peripheral clock controller.
+
+  Peripheral general control:
+
+  The peripheral general control block generates system interface clocks and
+  resets for various peripherals. It also contains miscellaneous peripheral
+  control registers.
+
+  Top-level general control:
+
+  The top-level general control block contains miscellaneous control registers
+  and gates for the external clocks "audio_clk_in" and "enet_clk_in".
+
+properties:
+  compatible:
+    items:
+      - enum:
+          - img,pistachio-clk
+          - img,pistachio-clk-periph
+          - img,pistachio-cr-periph
+          - img,pistachio-cr-top
+
+  reg:
+    maxItems: 1
+
+  '#clock-cells':
+    const: 1
+
+  clocks:
+    minItems: 1
+    maxItems: 3
+
+  clock-names:
+    minItems: 1
+    maxItems: 3
+
+required:
+  - compatible
+  - reg
+  - '#clock-cells'
+  - clocks
+  - clock-names
+
+allOf:
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: img,pistachio-clk
+    then:
+      properties:
+        clocks:
+          items:
+            - description: External 52Mhz oscillator
+            - description: Alternate audio reference clock
+            - description: Alternate ethernet PHY clock
+
+        clock-names:
+          items:
+            - const: xtal
+            - const: audio_refclk_ext_gate
+            - const: ext_enet_in_gate
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: img,pistachio-clk-periph
+    then:
+      properties:
+        clocks:
+          items:
+            - description: Peripheral system clock
+
+        clock-names:
+          items:
+            - const: periph_sys_core
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: img,pistachio-cr-periph
+    then:
+      properties:
+        clocks:
+          items:
+            - description: System interface clock
+
+        clock-names:
+          items:
+            - const: sys
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: img,pistachio-cr-top
+    then:
+      properties:
+        clocks:
+          items:
+            - description: External audio reference clock
+            - description: External ethernet PHY clock
+
+        clock-names:
+          items:
+            - const: audio_clk_in
+            - const: enet_clk_in
+
+additionalProperties: false

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