ASoC: dt-bindings: omap-mcpdm: Convert to DT schema

Convert the OMAP4+ McPDM bindings from txt to yaml (dtschema).
Drop ti,hwmods property as it is not needed since the sysc conversion.
Add dma, dma-names, reg-names properties to match the DTS so as to not
break the already existing ABI.
Also update example node to match the existing node in the DTS.

Signed-off-by: Mithil Bavishi <[e-mail]>
Reviewed-by: Krzysztof Kozlowski <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Mark Brown <[e-mail]>

Documentation/devicetree/bindings/sound/omap-mcpdm.txt

···
-* Texas Instruments OMAP4+ McPDM
-
-Required properties:
-- compatible: "ti,omap4-mcpdm"
-- reg: Register location and size as an array:
-       <MPU access base address, size>,
-       <L3 interconnect address, size>;
-- interrupts: Interrupt number for McPDM
-- ti,hwmods: Name of the hwmod associated to the McPDM
-- clocks:  phandle for the pdmclk provider, likely <&twl6040>
-- clock-names: Must be "pdmclk"
-
-Example:
-
-mcpdm: mcpdm@40132000 {
-	compatible = "ti,omap4-mcpdm";
-	reg = <0x40132000 0x7f>, /* MPU private access */
-	      <0x49032000 0x7f>; /* L3 Interconnect */
-	interrupts = <0 112 0x4>;
-	interrupt-parent = <&gic>;
-	ti,hwmods = "mcpdm";
-};
-
-In board DTS file the pdmclk needs to be added:
-
-&mcpdm {
-	clocks = <&twl6040>;
-	clock-names = "pdmclk";
-	status = "okay";
-};

Documentation/devicetree/bindings/sound/ti,omap4-mcpdm.yaml

···
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/ti,omap4-mcpdm.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: OMAP McPDM
+
+maintainers:
+  - Misael Lopez Cruz <[e-mail]>
+
+description:
+  OMAP ALSA SoC DAI driver using McPDM port used by TWL6040
+
+properties:
+  compatible:
+    const: ti,omap4-mcpdm
+
+  reg:
+    items:
+      - description: MPU access base address
+      - description: L3 interconnect address
+
+  reg-names:
+    items:
+      - const: mpu
+      - const: dma
+
+  interrupts:
+    maxItems: 1
+
+  dmas:
+    maxItems: 2
+
+  dma-names:
+    items:
+      - const: up_link
+      - const: dn_link
+
+  clocks:
+    maxItems: 1
+
+  clock-names:
+    items:
+      - const: pdmclk
+
+required:
+  - compatible
+  - reg
+  - reg-names
+  - interrupts
+  - dmas
+  - dma-names
+  - clocks
+  - clock-names
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    mcpdm@0 {
+      compatible = "ti,omap4-mcpdm";
+      reg = <0x0 0x7f>, /* MPU private access */
+            <0x49032000 0x7f>; /* L3 Interconnect */
+      reg-names = "mpu", "dma";
+      interrupts = <GIC_SPI 112 IRQ_TYPE_LEVEL_HIGH>;
+      interrupt-parent = <&gic>;
+      dmas = <&sdma 65>, <&sdma 66>;
+      dma-names = "up_link", "dn_link";
+      clocks = <&twl6040>;
+      clock-names = "pdmclk";
+    };