dt-bindings: power: Convert imx gpcv2 to json-schema

Convert the i.MX GPCv2 binding to DT schema format using json-schema

Example is updated based on latest DT file and consumer's example is
removed since it is NOT that useful.
Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Signed-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/power/fsl,imx-gpcv2.txt

-Freescale i.MX General Power Controller v2
-==========================================
-
-The i.MX7S/D General Power Control (GPC) block contains Power Gating
-Control (PGC) for various power domains.
-
-Required properties:
-
-- compatible: Should be one of:
-	- "fsl,imx7d-gpc"
-	- "fsl,imx8mq-gpc"
-
-- reg: should be register base and length as documented in the
-  datasheet
-
-- interrupts: Should contain GPC interrupt request 1
-
-Power domains contained within GPC node are generic power domain
-providers, documented in
-Documentation/devicetree/bindings/power/power-domain.yaml, which are
-described as subnodes of the power gating controller 'pgc' node,
-which, in turn, is expected to contain the following:
-
-Required properties:
-
-- reg: Power domain index. Valid values are defined in
-  include/dt-bindings/power/imx7-power.h for fsl,imx7d-gpc and
-  include/dt-bindings/power/imx8m-power.h for fsl,imx8mq-gpc
-
-- #power-domain-cells: Should be 0
-
-Optional properties:
-
-- power-supply: Power supply used to power the domain
-- clocks: a number of phandles to clocks that need to be enabled during
-  domain power-up sequencing to ensure reset propagation into devices
-  located inside this power domain
-
-Example:
-
-	gpc: gpc@303a0000 {
-		compatible = "fsl,imx7d-gpc";
-		reg = <0x303a0000 0x1000>;
-		interrupt-controller;
-		interrupts = <GIC_SPI 87 IRQ_TYPE_LEVEL_HIGH>;
-		#interrupt-cells = <3>;
-		interrupt-parent = <&intc>;
-
-		pgc {
-			#address-cells = <1>;
-			#size-cells = <0>;
-
-			pgc_pcie_phy: power-domain@1 {
-				#power-domain-cells = <0>;
-
-				reg = <1>;
-				power-supply = <&reg_1p0d>;
-			};
-		};
-	};
-
-
-Specifying power domain for IP modules
-======================================
-
-IP cores belonging to a power domain should contain a 'power-domains'
-property that is a phandle for PGC node representing the domain.
-
-Example of a device that is part of the PCIE_PHY power domain:
-
-	pcie: pcie@33800000 {
-	      reg = <0x33800000 0x4000>,
-	            <0x4ff00000 0x80000>;
-		/* ... */
-		power-domains = <&pgc_pcie_phy>;
-		/* ... */
-	};

Documentation/devicetree/bindings/power/fsl,imx-gpcv2.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/power/fsl,imx-gpcv2.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Freescale i.MX General Power Controller v2
+
+maintainers:
+  - Andrey Smirnov <andrew.smirnov@gmail.com>
+
+description: |
+  The i.MX7S/D General Power Control (GPC) block contains Power Gating
+  Control (PGC) for various power domains.
+
+  Power domains contained within GPC node are generic power domain
+  providers, documented in
+  Documentation/devicetree/bindings/power/power-domain.yaml, which are
+  described as subnodes of the power gating controller 'pgc' node.
+
+  IP cores belonging to a power domain should contain a 'power-domains'
+  property that is a phandle for PGC node representing the domain.
+
+properties:
+  compatible:
+    enum:
+      - fsl,imx7d-gpc
+      - fsl,imx8mq-gpc
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  pgc:
+    type: object
+    description: list of power domains provided by this controller.
+
+    patternProperties:
+      "power-domain@[0-9]$":
+        type: object
+        properties:
+
+          '#power-domain-cells':
+            const: 0
+
+          reg:
+            description: |
+              Power domain index. Valid values are defined in
+              include/dt-bindings/power/imx7-power.h for fsl,imx7d-gpc and
+              include/dt-bindings/power/imx8m-power.h for fsl,imx8mq-gpc
+            maxItems: 1
+
+          clocks:
+            description: |
+              A number of phandles to clocks that need to be enabled during domain
+              power-up sequencing to ensure reset propagation into devices located
+              inside this power domain.
+            minItems: 1
+            maxItems: 5
+
+          power-supply: true
+
+        required:
+          - '#power-domain-cells'
+          - reg
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - pgc
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+    gpc@303a0000 {
+        compatible = "fsl,imx7d-gpc";
+        reg = <0x303a0000 0x1000>;
+        interrupts = <GIC_SPI 87 IRQ_TYPE_LEVEL_HIGH>;
+
+        pgc {
+            #address-cells = <1>;
+            #size-cells = <0>;
+
+            pgc_mipi_phy: power-domain@0 {
+                #power-domain-cells = <0>;
+                reg = <0>;
+                power-supply = <&reg_1p0d>;
+            };
+
+            pgc_pcie_phy: power-domain@1 {
+                #power-domain-cells = <0>;
+                reg = <1>;
+                power-supply = <&reg_1p0d>;
+            };
+
+            pgc_hsic_phy: power-domain@2 {
+                #power-domain-cells = <0>;
+                reg = <2>;
+                power-supply = <&reg_1p2>;
+            };
+        };
+    };