[PATCH v2 1/2] ASoC: dt-bindings: Add bindings for Cadence I2S-MC controller

[Xingyu Wu <xingyu.wu@starfivetech.com>]

Add bindings for the Multi-Channel I2S controller of Cadence.

The Multi-Channel I2S (I2S-MC) implements a function of the
8-channel I2S bus interfasce. Each channel can become receiver
or transmitter. Four I2S instances are used on the StarFive
JH8100 SoC. One instance of them is limited to 2 channels, two
instance are limited to 4 channels, and the other one can use
most 8 channels. Add a unique property about
'starfive,i2s-max-channels' to distinguish each instance.

Signed-off-by: Xingyu Wu <xingyu.wu@starfivetech.com>
---
 .../bindings/sound/cdns,i2s-mc.yaml           | 110 ++++++++++++++++++
 1 file changed, 110 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/sound/cdns,i2s-mc.yaml

diff --git a/Documentation/devicetree/bindings/sound/cdns,i2s-mc.yaml b/Documentation/devicetree/bindings/sound/cdns,i2s-mc.yaml
new file mode 100644
index 000000000000..0a1b0122a246
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/cdns,i2s-mc.yaml
@@ -0,0 +1,110 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/cdns,i2s-mc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Cadence multi-channel I2S controller
+
+description:
+  The Cadence I2S Controller implements a function of the multi-channel
+  (up to 8-channel) bus. It combines functions of a transmitter and a receiver.
+
+maintainers:
+  - Xingyu Wu <xingyu.wu@starfivetech.com>
+
+properties:
+  compatible:
+    enum:
+      - cdns,i2s-mc
+      - starfive,jh8100-i2s
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    description:
+      The interrupt line number for the I2S controller. Add this
+      parameter if the I2S controller that you are using does not
+      using DMA.
+    maxItems: 1
+
+  clocks:
+    items:
+      - description: Bit clock
+      - description: Main ICG clock
+      - description: Inner master clock
+
+  clock-names:
+    items:
+      - const: bclk
+      - const: icg
+      - const: mclk_inner
+
+  resets:
+    maxItems: 1
+
+  dmas:
+    items:
+      - description: TX DMA Channel
+      - description: RX DMA Channel
+    minItems: 1
+
+  dma-names:
+    items:
+      - const: tx
+      - const: rx
+    minItems: 1
+
+  "#sound-dai-cells":
+    const: 0
+
+allOf:
+  - $ref: dai-common.yaml#
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: starfive,jh8100-i2s
+    then:
+      properties:
+        starfive,i2s-max-channels:
+          description:
+            Number of I2S max stereo channels supported on the StarFive
+            JH8100 SoC.
+          $ref: /schemas/types.yaml#/definitions/uint32
+          enum: [2, 4, 8]
+      required:
+        - starfive,i2s-max-channels
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - clock-names
+  - resets
+
+oneOf:
+  - required:
+      - dmas
+      - dma-names
+  - required:
+      - interrupts
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    i2s@122b0000 {
+      compatible = "cdns,i2s-mc";
+      reg = <0x122b0000 0x1000>;
+      clocks = <&syscrg_ne 133>,
+               <&syscrg_ne 170>,
+               <&syscrg 50>;
+      clock-names = "bclk", "icg",
+                    "mclk_inner";
+      resets = <&syscrg_ne 43>;
+      dmas = <&dma 7>, <&dma 6>;
+      dma-names = "tx", "rx";
+      #sound-dai-cells = <0>;
+    };
-- 
2.25.1