ASoC: dt-bindings: sound: cirrus: cs530x: Add SPI bus support

The CS530x device family supports multiple control interfaces.
At present, only the I2C interface is implemented. Adding support
for the SPI control interface, operating at up to 24 MHz.

Signed-off-by: Vitaly Rodionov <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Mark Brown <[e-mail]>

Documentation/devicetree/bindings/sound/cirrus,cs530x.yaml

···
 
 allOf:
   - $ref: dai-common.yaml#
+  - $ref: /schemas/spi/spi-peripheral-props.yaml#
 
 properties:
   compatible:
···
 
   reg:
     maxItems: 1
+
+  spi-max-frequency:
+    maximum: 24000000
 
   '#sound-dai-cells':
     const: 1