dt-bindings: dma: Convert jz4740-dma doc to YAML

Convert the textual documentation for the Ingenic SoCs DMA Controller
devicetree binding to YAML.
Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Signed-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/dma/ingenic,dma.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/dma/ingenic,dma.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Ingenic SoCs DMA Controller DT bindings
+
+maintainers:
+  - Paul Cercueil <paul@crapouillou.net>
+
+allOf:
+  - $ref: "dma-controller.yaml#"
+
+properties:
+  compatible:
+    enum:
+      - ingenic,jz4740-dma
+      - ingenic,jz4725b-dma
+      - ingenic,jz4770-dma
+      - ingenic,jz4780-dma
+      - ingenic,x1000-dma
+      - ingenic,x1830-dma
+
+  reg:
+    items:
+      - description: Channel-specific registers
+      - description: System control registers
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  "#dma-cells":
+    const: 2
+    description: >
+      DMA clients must use the format described in dma.txt, giving a phandle
+      to the DMA controller plus the following 2 integer cells:
+
+      - Request type: The DMA request type for transfers to/from the
+        device on the allocated channel, as defined in the SoC documentation.
+
+      - Channel: If set to 0xffffffff, any available channel will be allocated
+        for the client. Otherwise, the exact channel specified will be used.
+        The channel should be reserved on the DMA controller using the
+        ingenic,reserved-channels property.
+
+  ingenic,reserved-channels:
+    $ref: /schemas/types.yaml#definitions/uint32
+    description: >
+      Bitmask of channels to reserve for devices that need a specific
+      channel. These channels will only be assigned when explicitely
+      requested by a client. The primary use for this is channels 0 and
+      1, which can be configured to have special behaviour for NAND/BCH
+      when using programmable firmware.
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clocks
+
+examples:
+  - |
+    #include <dt-bindings/clock/jz4780-cgu.h>
+    dma: dma-controller@13420000 {
+      compatible = "ingenic,jz4780-dma";
+      reg = <0x13420000 0x400>, <0x13421000 0x40>;
+
+      interrupt-parent = <&intc>;
+      interrupts = <10>;
+
+      clocks = <&cgu JZ4780_CLK_PDMA>;
+
+      #dma-cells = <2>;
+
+      ingenic,reserved-channels = <0x3>;
+    };

Documentation/devicetree/bindings/dma/jz4780-dma.txt

-* Ingenic XBurst DMA Controller
-
-Required properties:
-
-- compatible: Should be one of:
-  * ingenic,jz4740-dma
-  * ingenic,jz4725b-dma
-  * ingenic,jz4770-dma
-  * ingenic,jz4780-dma
-  * ingenic,x1000-dma
-  * ingenic,x1830-dma
-- reg: Should contain the DMA channel registers location and length, followed
-  by the DMA controller registers location and length.
-- interrupts: Should contain the interrupt specifier of the DMA controller.
-- clocks: Should contain a clock specifier for the JZ4780/X1000/X1830 PDMA
-  clock.
-- #dma-cells: Must be <2>. Number of integer cells in the dmas property of
-  DMA clients (see below).
-
-Optional properties:
-
-- ingenic,reserved-channels: Bitmask of channels to reserve for devices that
-  need a specific channel. These channels will only be assigned when explicitly
-  requested by a client. The primary use for this is channels 0 and 1, which
-  can be configured to have special behaviour for NAND/BCH when using
-  programmable firmware.
-
-Example:
-
-dma: dma-controller@13420000 {
-	compatible = "ingenic,jz4780-dma";
-	reg = <0x13420000 0x400
-	       0x13421000 0x40>;
-
-	interrupt-parent = <&intc>;
-	interrupts = <10>;
-
-	clocks = <&cgu JZ4780_CLK_PDMA>;
-
-	#dma-cells = <2>;
-
-	ingenic,reserved-channels = <0x3>;
-};
-
-DMA clients must use the format described in dma.txt, giving a phandle to the
-DMA controller plus the following 2 integer cells:
-
-1. Request type: The DMA request type for transfers to/from the device on
-   the allocated channel, as defined in the SoC documentation.
-
-2. Channel: If set to 0xffffffff, any available channel will be allocated for
-   the client. Otherwise, the exact channel specified will be used. The channel
-   should be reserved on the DMA controller using the ingenic,reserved-channels
-   property.
-
-Example:
-
-uart0: serial@10030000 {
-	...
-	dmas = <&dma 0x14 0xffffffff
-		&dma 0x15 0xffffffff>;
-	dma-names = "tx", "rx";
-	...
-};