ASoC: tlv320adcx140: Add device tree property for PDM edges

Add a device tree property to configure the PDM sampling edge for each
digital microphone.

Signed-off-by: Dan Murphy <dmurphy@ti.com>
CC: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20200514123338.20392-2-dmurphy@ti.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/tlv320adcx140.yaml

@@ -63,6 +63,29 @@ properties:
       - $ref: /schemas/types.yaml#/definitions/uint32
       - enum: [0, 1, 2]
 
+  ti,pdm-edge-select:
+    description: |
+       Defines the PDMCLK sampling edge configuration for the PDM inputs.  This
+       array is defined as <PDMIN1 PDMIN2 PDMIN3 PDMIN4>.
+
+       0 - (default) Odd channel is latched on the negative edge and even
+       channel is latched on the the positive edge.
+       1 - Odd channel is latched on the positive edge and even channel is
+       latched on the the negative edge.
+
+       PDMIN1 - PDMCLK latching edge used for channel 1 and 2 data
+       PDMIN2 - PDMCLK latching edge used for channel 3 and 4 data
+       PDMIN3 - PDMCLK latching edge used for channel 5 and 6 data
+       PDMIN4 - PDMCLK latching edge used for channel 7 and 8 data
+
+    allOf:
+      - $ref: /schemas/types.yaml#/definitions/uint32-array
+      - minItems: 1
+        maxItems: 4
+        items:
+          maximum: 1
+        default: [0, 0, 0, 0]
+
 required:
   - compatible
   - reg
@@ -77,6 +100,7 @@ examples:
         compatible = "ti,tlv320adc5140";
         reg = <0x4c>;
         ti,mic-bias-source = <6>;
+        ti,pdm-edge-select = <0 1 0 1>;
         reset-gpios = <&gpio0 14 GPIO_ACTIVE_HIGH>;
       };
     };