ASoC: dt-bindings: Add sample format conversion

Presently "convert-channels" and "convert-rate" DT bindings are available
for channel and rate fixups respectively.

Similarly add "convert-sample-format" binding to fixup DAI sample format
as well. This is added to audio-graph-card based bindings.

Signed-off-by: Sameer Pujar <spujar@nvidia.com>
Cc: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/1659936452-2254-3-git-send-email-spujar@nvidia.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/audio-graph-port.yaml

@@ -22,6 +22,8 @@ properties:
     $ref: "/schemas/sound/dai-params.yaml#/$defs/dai-sample-rate"
   convert-channels:
     $ref: "/schemas/sound/dai-params.yaml#/$defs/dai-channels"
+  convert-sample-format:
+    $ref: "/schemas/sound/dai-params.yaml#/$defs/dai-sample-format"
 
 patternProperties:
   "^endpoint(@[0-9a-f]+)?":
@@ -67,6 +69,8 @@ patternProperties:
         $ref: "/schemas/sound/dai-params.yaml#/$defs/dai-sample-rate"
       convert-channels:
         $ref: "/schemas/sound/dai-params.yaml#/$defs/dai-channels"
+      convert-sample-format:
+        $ref: "/schemas/sound/dai-params.yaml#/$defs/dai-sample-format"
 
       dai-tdm-slot-width-map:
         description: Mapping of sample widths to slot widths. For hardware

Documentation/devicetree/bindings/sound/audio-graph.yaml

@@ -30,6 +30,8 @@ properties:
     $ref: "/schemas/sound/dai-params.yaml#/$defs/dai-sample-rate"
   convert-channels:
     $ref: "/schemas/sound/dai-params.yaml#/$defs/dai-channels"
+  convert-sample-format:
+    $ref: "/schemas/sound/dai-params.yaml#/$defs/dai-sample-format"
 
   pa-gpios:
     maxItems: 1

Documentation/devicetree/bindings/sound/dai-params.yaml

@@ -19,6 +19,16 @@ $defs:
     minimum: 1
     maximum: 32
 
+  dai-sample-format:
+    description: Audio sample format used by DAI
+    $ref: /schemas/types.yaml#/definitions/string
+    enum:
+      - s8
+      - s16_le
+      - s24_le
+      - s24_3le
+      - s32_le
+
   dai-sample-rate:
     description: Audio sample rate used by DAI
     $ref: /schemas/types.yaml#/definitions/uint32