[PATCH 2/2] SoC: dt-bindings: asahi-kasei,ak4619: Add PDN GPIO support

[Alexander Koch <mail@alexanderkoch.net>]

Add documentation for optional property that enables operation of the
'PDN' pin during initialization:

    codec@10 {
        compatible = "asahi-kasei,ak4619";
        reg = <0x10>;
        pdn-gpios = <&gpio1 0 GPIO_ACTIVE_HIGH>;  // <--
        #sound-dai-cells = <0>;
    };

Signed-off-by: Alexander Koch <mail@alexanderkoch.net>
---
 .../devicetree/bindings/sound/asahi-kasei,ak4619.yaml     | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Documentation/devicetree/bindings/sound/asahi-kasei,ak4619.yaml b/Documentation/devicetree/bindings/sound/asahi-kasei,ak4619.yaml
index d412531ef9a2..3c7754351e8a 100644
--- a/Documentation/devicetree/bindings/sound/asahi-kasei,ak4619.yaml
+++ b/Documentation/devicetree/bindings/sound/asahi-kasei,ak4619.yaml
@@ -34,6 +34,12 @@ properties:
     $ref: audio-graph-port.yaml#
     unevaluatedProperties: false
 
+  pdn-gpios:
+    maxItems: 1
+    description:
+      GPIO controlling the AK4619 PDN input pin. Used during driver
+      probing to power up the codec.
+
 required:
   - compatible
   - reg
@@ -49,6 +55,8 @@ examples:
             compatible = "asahi-kasei,ak4619";
             reg = <0x10>;
 
+            pdn-gpios = <&gpio1 0 GPIO_ACTIVE_HIGH>;
+
             clocks = <&rcar_sound>;
             clock-names = "mclk";
 
-- 
2.55.0