dt-bindings: timer: Convert img,pistachio-gptimer to DT schema

Convert the ImgTec Pistachio Timer binding to DT schema format. It's a
straight-forward conversion.

Signed-off-by: Rob Herring (Arm) <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Daniel Lezcano <[e-mail]>

Documentation/devicetree/bindings/timer/img,pistachio-gptimer.txt

···
-* Pistachio general-purpose timer based clocksource
-
-Required properties:
- - compatible: "img,pistachio-gptimer".
- - reg: Address range of the timer registers.
- - interrupts: An interrupt for each of the four timers
- - clocks: Should contain a clock specifier for each entry in clock-names
- - clock-names: Should contain the following entries:
-                "sys", interface clock
-                "slow", slow counter clock
-                "fast", fast counter clock
- - img,cr-periph: Must contain a phandle to the peripheral control
-		  syscon node.
-
-Example:
-	timer: timer@18102000 {
-		compatible = "img,pistachio-gptimer";
-		reg = <0x18102000 0x100>;
-		interrupts = <GIC_SHARED 60 IRQ_TYPE_LEVEL_HIGH>,
-			     <GIC_SHARED 61 IRQ_TYPE_LEVEL_HIGH>,
-			     <GIC_SHARED 62 IRQ_TYPE_LEVEL_HIGH>,
-			     <GIC_SHARED 63 IRQ_TYPE_LEVEL_HIGH>;
-		clocks = <&clk_periph PERIPH_CLK_COUNTER_FAST>,
-		         <&clk_periph PERIPH_CLK_COUNTER_SLOW>,
-			 <&cr_periph SYS_CLK_TIMER>;
-		clock-names = "fast", "slow", "sys";
-		img,cr-periph = <&cr_periph>;
-	};

Documentation/devicetree/bindings/timer/img,pistachio-gptimer.yaml

···
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/img,pistachio-gptimer.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Pistachio general-purpose timer
+
+maintainers:
+  - Ezequiel Garcia <[e-mail]>
+
+properties:
+  compatible:
+    const: img,pistachio-gptimer
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    items:
+      - description: Timer0 interrupt
+      - description: Timer1 interrupt
+      - description: Timer2 interrupt
+      - description: Timer3 interrupt
+
+  clocks:
+    items:
+      - description: Fast counter clock
+      - description: Slow counter clock
+      - description: Interface clock
+
+  clock-names:
+    items:
+      - const: fast
+      - const: slow
+      - const: sys
+
+  img,cr-periph:
+    description: Peripheral control syscon phandle
+    $ref: /schemas/types.yaml#/definitions/phandle
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clocks
+  - clock-names
+  - img,cr-periph
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/mips-gic.h>
+    #include <dt-bindings/clock/pistachio-clk.h>
+
+    timer@18102000 {
+        compatible = "img,pistachio-gptimer";
+        reg = <0x18102000 0x100>;
+        interrupts = <GIC_SHARED 60 IRQ_TYPE_LEVEL_HIGH>,
+                     <GIC_SHARED 61 IRQ_TYPE_LEVEL_HIGH>,
+                     <GIC_SHARED 62 IRQ_TYPE_LEVEL_HIGH>,
+                     <GIC_SHARED 63 IRQ_TYPE_LEVEL_HIGH>;
+        clocks = <&clk_periph PERIPH_CLK_COUNTER_FAST>,
+                 <&clk_periph PERIPH_CLK_COUNTER_SLOW>,
+                 <&cr_periph SYS_CLK_TIMER>;
+        clock-names = "fast", "slow", "sys";
+        img,cr-periph = <&cr_periph>;
+    };