ASoC: Add Renesas IDT821034 codec bindings

The Renesas IDT821034 codec is a quad PCM codec with programmable
gain.

Signed-off-by: Herve Codina <[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/renesas,idt821034.yaml

···
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/renesas,idt821034.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Renesas IDT821034 codec device
+
+maintainers:
+  - Herve Codina <[e-mail]>
+
+description: |
+  The IDT821034 codec is a four channel PCM codec with onchip filters and
+  programmable gain setting.
+
+  The time-slots used by the codec must be set and so, the properties
+  'dai-tdm-slot-num', 'dai-tdm-slot-width', 'dai-tdm-slot-tx-mask' and
+  'dai-tdm-slot-rx-mask' must be present in the ALSA sound card node for
+  sub-nodes that involve the codec. The codec uses one 8bit time-slot per
+  channel.
+  'dai-tdm-tdm-slot-with' must be set to 8.
+
+  The IDT821034 codec also supports 5 gpios (SLIC signals) per channel.
+
+allOf:
+  - $ref: /schemas/spi/spi-peripheral-props.yaml#
+  - $ref: dai-common.yaml#
+
+properties:
+  compatible:
+    const: renesas,idt821034
+
+  reg:
+    description:
+      SPI device address.
+    maxItems: 1
+
+  spi-max-frequency:
+    maximum: 8192000
+
+  spi-cpha: true
+
+  '#sound-dai-cells':
+    const: 0
+
+  '#gpio-cells':
+    const: 2
+
+  gpio-controller: true
+
+required:
+  - compatible
+  - reg
+  - spi-cpha
+  - '#sound-dai-cells'
+  - gpio-controller
+  - '#gpio-cells'
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    spi {
+        #address-cells = <1>;
+        #size-cells = <0>;
+        audio-codec@0 {
+            compatible = "renesas,idt821034";
+            reg = <0>;
+            spi-max-frequency = <8192000>;
+            spi-cpha;
+            #sound-dai-cells = <0>;
+            gpio-controller;
+            #gpio-cells = <2>;
+        };
+    };