linux-kernel - [PATCH v3 2/3] ASoC: tlv320adcx140: Add device tree property for PDM edges

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Date:   Thu, 14 May 2020 07:33:37 -0500
From:   Dan Murphy <dmurphy@...com>
To:     <lgirdwood@...il.com>, <broonie@...nel.org>, <perex@...ex.cz>,
        <tiwai@...e.com>
CC:     <alsa-devel@...a-project.org>, <linux-kernel@...r.kernel.org>,
        <devicetree@...r.kernel.org>, Dan Murphy <dmurphy@...com>,
        Rob Herring <robh@...nel.org>
Subject: [PATCH v3 2/3] ASoC: tlv320adcx140: Add device tree property for PDM edges

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

CC: Rob Herring <robh@...nel.org>
Signed-off-by: Dan Murphy <dmurphy@...com>
---

v3 - Updated description to be more descriptive and fixed example.

 .../bindings/sound/tlv320adcx140.yaml         | 24 +++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/Documentation/devicetree/bindings/sound/tlv320adcx140.yaml b/Documentation/devicetree/bindings/sound/tlv320adcx140.yaml
index ab2268c0ee67..daa6cc0e031b 100644
--- a/Documentation/devicetree/bindings/sound/tlv320adcx140.yaml
+++ b/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>;
       };
     };
-- 
2.26.2