ASoC: convert rk3328 codec binding to yaml

This patch converts Rockchip rk3328 audio codec binding to DT schema.
And adds description about "mclk" clock and fixes some errors in
original example.
Signed-off-by: Katsuhiro Suzuki <katsuhiro@katsuster.net>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20200714073247.172859-1-katsuhiro@katsuster.netSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/rockchip,rk3328-codec.txt

-* Rockchip Rk3328 internal codec
-
-Required properties:
-
-- compatible: "rockchip,rk3328-codec"
-- reg: physical base address of the controller and length of memory mapped
-  region.
-- rockchip,grf: the phandle of the syscon node for GRF register.
-- clocks: a list of phandle + clock-specifer pairs, one for each entry in clock-names.
-- clock-names: should be "pclk".
-- spk-depop-time-ms: speak depop time msec.
-
-Optional properties:
-
-- mute-gpios: GPIO specifier for external line driver control (typically the
-              dedicated GPIO_MUTE pin)
-
-Example for rk3328 internal codec:
-
-codec: codec@ff410000 {
-	compatible = "rockchip,rk3328-codec";
-	reg = <0x0 0xff410000 0x0 0x1000>;
-	rockchip,grf = <&grf>;
-	clocks = <&cru PCLK_ACODEC>;
-	clock-names = "pclk";
-	mute-gpios = <&grf_gpio 0 GPIO_ACTIVE_LOW>;
-	spk-depop-time-ms = 100;
-};

Documentation/devicetree/bindings/sound/rockchip,rk3328-codec.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/rockchip,rk3328-codec.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Rockchip rk3328 internal codec
+
+maintainers:
+  - Heiko Stuebner <heiko@sntech.de>
+
+properties:
+  compatible:
+    const: rockchip,rk3328-codec
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    items:
+      - description: clock for audio codec
+      - description: clock for I2S master clock
+
+  clock-names:
+    items:
+      - const: pclk
+      - const: mclk
+
+  rockchip,grf:
+    $ref: /schemas/types.yaml#/definitions/phandle
+    description:
+      The phandle of the syscon node for the GRF register.
+
+  spk-depop-time-ms:
+    default: 200
+    description:
+      Speaker depop time in msec.
+
+  mute-gpios:
+    maxItems: 1
+    description:
+      GPIO specifier for external line driver control (typically the
+      dedicated GPIO_MUTE pin)
+
+  "#sound-dai-cells":
+    const: 0
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - clock-names
+  - rockchip,grf
+  - "#sound-dai-cells"
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    #include <dt-bindings/clock/rk3328-cru.h>
+    codec: codec@ff410000 {
+      compatible = "rockchip,rk3328-codec";
+      reg = <0xff410000 0x1000>;
+      clocks = <&cru PCLK_ACODECPHY>, <&cru SCLK_I2S1>;
+      clock-names = "pclk", "mclk";
+      rockchip,grf = <&grf>;
+      mute-gpios = <&grf_gpio 0 GPIO_ACTIVE_LOW>;
+      spk-depop-time-ms = <100>;
+      #sound-dai-cells = <0>;
+    };