dt-bindings: dma: renesas,usb-dmac: convert bindings to json-schema

Convert Renesas R-Car USB-DMA Controller bindings documentation
to json-schema.
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/1587110829-26609-3-git-send-email-yoshihiro.shimoda.uh@renesas.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

Documentation/devicetree/bindings/dma/renesas,usb-dmac.txt

-* Renesas USB DMA Controller Device Tree bindings
-
-Required Properties:
--compatible: "renesas,<soctype>-usb-dmac", "renesas,usb-dmac" as fallback.
-	Examples with soctypes are:
-	  - "renesas,r8a7743-usb-dmac" (RZ/G1M)
-	  - "renesas,r8a7744-usb-dmac" (RZ/G1N)
-	  - "renesas,r8a7745-usb-dmac" (RZ/G1E)
-	  - "renesas,r8a77470-usb-dmac" (RZ/G1C)
-	  - "renesas,r8a774a1-usb-dmac" (RZ/G2M)
-	  - "renesas,r8a774b1-usb-dmac" (RZ/G2N)
-	  - "renesas,r8a774c0-usb-dmac" (RZ/G2E)
-	  - "renesas,r8a7790-usb-dmac" (R-Car H2)
-	  - "renesas,r8a7791-usb-dmac" (R-Car M2-W)
-	  - "renesas,r8a7793-usb-dmac" (R-Car M2-N)
-	  - "renesas,r8a7794-usb-dmac" (R-Car E2)
-	  - "renesas,r8a7795-usb-dmac" (R-Car H3)
-	  - "renesas,r8a7796-usb-dmac" (R-Car M3-W)
-	  - "renesas,r8a77961-usb-dmac" (R-Car M3-W+)
-	  - "renesas,r8a77965-usb-dmac" (R-Car M3-N)
-	  - "renesas,r8a77990-usb-dmac" (R-Car E3)
-	  - "renesas,r8a77995-usb-dmac" (R-Car D3)
-- reg: base address and length of the registers block for the DMAC
-- interrupts: interrupt specifiers for the DMAC, one for each entry in
-  interrupt-names.
-- interrupt-names: one entry per channel, named "ch%u", where %u is the
-  channel number ranging from zero to the number of channels minus one.
-- clocks: a list of phandle + clock-specifier pairs.
-- #dma-cells: must be <1>, the cell specifies the channel number of the DMAC
-  port connected to the DMA client.
-- dma-channels: number of DMA channels
-
-Example: R8A7790 (R-Car H2) USB-DMACs
-
-	usb_dmac0: dma-controller@e65a0000 {
-		compatible = "renesas,r8a7790-usb-dmac", "renesas,usb-dmac";
-		reg = <0 0xe65a0000 0 0x100>;
-		interrupts = <0 109 IRQ_TYPE_LEVEL_HIGH
-			      0 109 IRQ_TYPE_LEVEL_HIGH>;
-		interrupt-names = "ch0", "ch1";
-		clocks = <&mstp3_clks R8A7790_CLK_USBDMAC0>;
-		#dma-cells = <1>;
-		dma-channels = <2>;
-	};
-
-	usb_dmac1: dma-controller@e65b0000 {
-		compatible = "renesas,usb-dmac";
-		reg = <0 0xe65b0000 0 0x100>;
-		interrupts = <0 110 IRQ_TYPE_LEVEL_HIGH
-			      0 110 IRQ_TYPE_LEVEL_HIGH>;
-		interrupt-names = "ch0", "ch1";
-		clocks = <&mstp3_clks R8A7790_CLK_USBDMAC1>;
-		#dma-cells = <1>;
-		dma-channels = <2>;
-	};

Documentation/devicetree/bindings/dma/renesas,usb-dmac.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/dma/renesas,usb-dmac.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Renesas USB DMA Controller
+
+maintainers:
+  - Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
+
+allOf:
+  - $ref: "dma-controller.yaml#"
+
+properties:
+  compatible:
+    items:
+      - enum:
+          - renesas,r8a7743-usb-dmac  # RZ/G1M
+          - renesas,r8a7744-usb-dmac  # RZ/G1N
+          - renesas,r8a7745-usb-dmac  # RZ/G1E
+          - renesas,r8a77470-usb-dmac # RZ/G1C
+          - renesas,r8a774a1-usb-dmac # RZ/G2M
+          - renesas,r8a774b1-usb-dmac # RZ/G2N
+          - renesas,r8a774c0-usb-dmac # RZ/G2E
+          - renesas,r8a7790-usb-dmac  # R-Car H2
+          - renesas,r8a7791-usb-dmac  # R-Car M2-W
+          - renesas,r8a7793-usb-dmac  # R-Car M2-N
+          - renesas,r8a7794-usb-dmac  # R-Car E2
+          - renesas,r8a7795-usb-dmac  # R-Car H3
+          - renesas,r8a7796-usb-dmac  # R-Car M3-W
+          - renesas,r8a77961-usb-dmac # R-Car M3-W+
+          - renesas,r8a77965-usb-dmac # R-Car M3-N
+          - renesas,r8a77990-usb-dmac # R-Car E3
+          - renesas,r8a77995-usb-dmac # R-Car D3
+      - const: renesas,usb-dmac
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    minItems: 2
+    maxItems: 2
+
+  interrupt-names:
+    items:
+      - pattern: ch0
+      - pattern: ch1
+
+  clocks:
+    maxItems: 1
+
+  '#dma-cells':
+    const: 1
+    description:
+      The cell specifies the channel number of the DMAC port connected to
+      the DMA client.
+
+  dma-channels:
+    const: 2
+
+  iommus:
+    minItems: 2
+    maxItems: 2
+
+  power-domains:
+    maxItems: 1
+
+  resets:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - interrupt-names
+  - clocks
+  - '#dma-cells'
+  - dma-channels
+  - power-domains
+  - resets
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/r8a7790-cpg-mssr.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/power/r8a7790-sysc.h>
+
+    usb_dmac0: dma-controller@e65a0000 {
+        compatible = "renesas,r8a7790-usb-dmac", "renesas,usb-dmac";
+        reg = <0xe65a0000 0x100>;
+        interrupts = <GIC_SPI 109 IRQ_TYPE_LEVEL_HIGH>,
+                     <GIC_SPI 109 IRQ_TYPE_LEVEL_HIGH>;
+        interrupt-names = "ch0", "ch1";
+        clocks = <&cpg CPG_MOD 330>;
+        power-domains = <&sysc R8A7790_PD_ALWAYS_ON>;
+        resets = <&cpg 330>;
+        #dma-cells = <1>;
+        dma-channels = <2>;
+    };