ASoC: lochnagar: Move binding over to dtschema

Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Signed-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/sound/cirrus,lochnagar.txt

-Cirrus Logic Lochnagar Audio Development Board
-
-Lochnagar is an evaluation and development board for Cirrus Logic
-Smart CODEC and Amp devices. It allows the connection of most Cirrus
-Logic devices on mini-cards, as well as allowing connection of
-various application processor systems to provide a full evaluation
-platform.  Audio system topology, clocking and power can all be
-controlled through the Lochnagar, allowing the device under test
-to be used in a variety of possible use cases.
-
-This binding document describes the binding for the audio portion
-of the driver.
-
-This binding must be part of the Lochnagar MFD binding:
-  [4] ../mfd/cirrus,lochnagar.txt
-
-Required properties:
-
-  - compatible : One of the following strings:
-                 "cirrus,lochnagar2-soundcard"
-
-  - #sound-dai-cells : Must be set to 1.
-
-  - clocks : Contains an entry for each entry in clock-names.
-  - clock-names : Must include the following clocks:
-      "mclk" Master clock source for the sound card, should normally
-      be set to LOCHNAGAR_SOUNDCARD_MCLK provided by the Lochnagar
-      clock driver.
-
-Example:
-
-lochnagar-sc {
-	compatible = "cirrus,lochnagar2-soundcard";
-
-	#sound-dai-cells = <1>;
-
-	clocks = <&lochnagar_clk LOCHNAGAR_SOUNDCARD_MCLK>;
-	clock-names = "mclk";
-};

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

+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/cirrus,lochnagar.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Cirrus Logic Lochnagar Audio Development Board
+
+maintainers:
+  - patches@opensource.cirrus.com
+
+description: |
+  Lochnagar is an evaluation and development board for Cirrus Logic
+  Smart CODEC and Amp devices. It allows the connection of most Cirrus
+  Logic devices on mini-cards, as well as allowing connection of various
+  application processor systems to provide a full evaluation platform.
+  Audio system topology, clocking and power can all be controlled through
+  the Lochnagar, allowing the device under test to be used in a variety of
+  possible use cases.
+
+  This binding document describes the binding for the audio portion of the
+  driver.
+
+  This binding must be part of the Lochnagar MFD binding:
+    [1] ../mfd/cirrus,lochnagar.yaml
+
+properties:
+  compatible:
+    enum:
+      - cirrus,lochnagar2-soundcard
+
+  '#sound-dai-cells':
+    description:
+      The first cell indicating the audio interface.
+    const: 1
+
+  clocks:
+    description:
+      Master clock source for the sound card, should normally be set to
+      LOCHNAGAR_SOUNDCARD_MCLK provided by the Lochnagar clock driver.
+    maxItems: 1
+
+  clock-names:
+    const: mclk
+
+required:
+  - compatible
+  - '#sound-dai-cells'
+  - clocks
+  - clock-names
+
+additionalProperties: false