ASoC: Convert cirrus,cs42l51 to json-schema

Convert cirrus,cs42l51 to yaml format.
Signed-off-by: Benjamin Gaignard <benjamin.gaignard@st.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20200228152706.29749-1-benjamin.gaignard@st.comSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/cirrus,cs42l51.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/cirrus,cs42l51.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: CS42L51 audio codec DT bindings
+
+maintainers:
+  - Olivier Moysan <olivier.moysan@st.com>
+
+properties:
+  compatible:
+      const: cirrus,cs42l51
+
+  reg:
+    maxItems: 1
+
+  "#sound-dai-cells":
+    const: 0
+
+  clocks:
+    maxItems: 1
+
+  clock-names:
+    items:
+      - const: MCLK
+
+  reset-gpios:
+    maxItems: 1
+
+  VL-supply:
+    description: phandle to voltage regulator of digital interface section
+
+  VD-supply:
+    description: phandle to voltage regulator of digital internal section
+
+  VA-supply:
+    description: phandle to voltage regulator of analog internal section
+
+  VAHP-supply:
+    description: phandle to voltage regulator of headphone
+
+required:
+  - compatible
+  - reg
+  - "#sound-dai-cells"
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    i2c@0 {
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      cs42l51@4a {
+        compatible = "cirrus,cs42l51";
+        reg = <0x4a>;
+        #sound-dai-cells = <0>;
+        clocks = <&mclk_prov>;
+        clock-names = "MCLK";
+        VL-supply = <&reg_audio>;
+        VD-supply = <&reg_audio>;
+        VA-supply = <&reg_audio>;
+        VAHP-supply = <&reg_audio>;
+        reset-gpios = <&gpiog 9 GPIO_ACTIVE_LOW>;
+      };
+    };
+...

Documentation/devicetree/bindings/sound/cs42l51.txt

-CS42L51 audio CODEC
-
-Required properties:
-
-  - compatible : "cirrus,cs42l51"
-
-  - reg : the I2C address of the device for I2C.
-
-Optional properties:
-  - VL-supply, VD-supply, VA-supply, VAHP-supply: power supplies for the device,
-    as covered in Documentation/devicetree/bindings/regulator/regulator.txt.
-
-  - reset-gpios : GPIO specification for the reset pin. If specified, it will be
-    deasserted before starting the communication with the codec.
-
-  - clocks : a list of phandles + clock-specifiers, one for each entry in
-    clock-names
-
-  - clock-names : must contain "MCLK"
-
-Example:
-
-cs42l51: cs42l51@4a {
-	compatible = "cirrus,cs42l51";
-	reg = <0x4a>;
-	clocks = <&mclk_prov>;
-	clock-names = "MCLK";
-	VL-supply = <&reg_audio>;
-	VD-supply = <&reg_audio>;
-	VA-supply = <&reg_audio>;
-	VAHP-supply = <&reg_audio>;
-	reset-gpios = <&gpiog 9 GPIO_ACTIVE_LOW>;
-};