[PATCH v2 1/2] ASoC: dt-bindings: cirrus,cs42xx8: Add SPI bus support

[chancel.liu@oss.nxp.com]

From: Chancel Liu <chancel.liu@nxp.com>

Codec CS42448/CS42888 supports multiple control interfaces. At present,
only the I2C interface is implemented. Adding support for the SPI
control interface, operating at up to 6MHz.

Signed-off-by: Chancel Liu <chancel.liu@nxp.com>
---
 .../bindings/sound/cirrus,cs42xx8.yaml        | 23 +++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/Documentation/devicetree/bindings/sound/cirrus,cs42xx8.yaml b/Documentation/devicetree/bindings/sound/cirrus,cs42xx8.yaml
index 7ae72bd901f4..a1ae548c4b7b 100644
--- a/Documentation/devicetree/bindings/sound/cirrus,cs42xx8.yaml
+++ b/Documentation/devicetree/bindings/sound/cirrus,cs42xx8.yaml
@@ -11,6 +11,7 @@ maintainers:
 
 allOf:
   - $ref: dai-common.yaml#
+  - $ref: /schemas/spi/spi-peripheral-props.yaml#
 
 properties:
   compatible:
@@ -21,6 +22,9 @@ properties:
   reg:
     maxItems: 1
 
+  spi-max-frequency:
+    maximum: 6000000
+
   clocks:
     minItems: 1
     maxItems: 2
@@ -86,3 +90,22 @@ examples:
           reset-gpios = <&gpio 1>;
       };
     };
+
+    spi {
+      #address-cells = <1>;
+      #size-cells = <0>;
+      cs-gpios = <&gpio 8 0>;
+
+      codec@0 {
+          compatible = "cirrus,cs42888";
+          reg = <0>;
+          spi-max-frequency = <6000000>;
+          clocks = <&codec_mclk 0>;
+          clock-names = "mclk";
+          VA-supply = <&reg_audio>;
+          VD-supply = <&reg_audio>;
+          VLS-supply = <&reg_audio>;
+          VLC-supply = <&reg_audio>;
+          reset-gpios = <&gpio 1>;
+      };
+    };
-- 
2.50.1