linux-kernel - [PATCH 1/4] dt-bindings: sound: Add simple-iio-aux

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Message-Id: <20230421124122.324820-2-herve.codina@bootlin.com>
Date:   Fri, 21 Apr 2023 14:41:19 +0200
From:   Herve Codina <herve.codina@...tlin.com>
To:     Herve Codina <herve.codina@...tlin.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>
Cc:     alsa-devel@...a-project.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: [PATCH 1/4] dt-bindings: sound: Add simple-iio-aux

Industrial I/O devices can be present in the audio path.
These devices needs to be viewed as audio components in order to be
fully integrated in the audio path.

simple-iio-aux allows to consider these Industrial I/O devices as
auxliary audio devices.

Signed-off-by: Herve Codina <herve.codina@...tlin.com>
---
 .../bindings/sound/simple-iio-aux.yaml        | 65 +++++++++++++++++++
 1 file changed, 65 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/sound/simple-iio-aux.yaml

diff --git a/Documentation/devicetree/bindings/sound/simple-iio-aux.yaml b/Documentation/devicetree/bindings/sound/simple-iio-aux.yaml
new file mode 100644
index 000000000000..fab128fce4fc
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/simple-iio-aux.yaml
@@ -0,0 +1,65 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/simple-iio-aux.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Simple IIO auxiliary
+
+maintainers:
+  - Herve Codina <herve.codina@...tlin.com>
+
+description: |
+  Auxiliary device based on Industrial I/O device channels
+
+allOf:
+  - $ref: /schemas/iio/iio-consumer.yaml
+  - $ref: dai-common.yaml#
+
+properties:
+  compatible:
+    const: simple-iio-aux
+
+  io-channels:
+    description:
+      Industrial I/O device channels used
+
+  io-channel-names:
+    description:
+      Industrial I/O channel names related to io-channels.
+      These names are used to provides sound controls, widgets and routes names.
+
+  invert:
+    $ref: /schemas/types.yaml#/definitions/uint32-array
+    description: |
+      A list of 0/1 flags defining whether or not the related channel is
+      inverted
+    items:
+      enum: [0, 1]
+      default: 0
+      description: |
+        Invert the sound control value compared to the IIO channel raw value.
+          - 1: The related sound control value is inverted meaning that the
+               minimum sound control value correspond to the maximum IIO channel
+               raw value and the maximum sound control value correspond to the
+               minimum IIO channel raw value.
+          - 0: The related sound control value is not inverted meaning that the
+               minimum (resp maximum) sound control value correspond to the
+               minimum (resp maximum) IIO channel raw value.
+
+required:
+  - compatible
+  - io-channels
+  - io-channel-names
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    aux {
+        compatible = "simple-iio-aux";
+        io-channels = <&iio 0>, <&iio 1>, <&iio 2>, <&iio 3>;
+        io-channel-names = "CH0", "CH1", "CH2", "CH3";
+        /* Invert CH1 and CH2 */
+        invert = <0 1 1>;
+    };
-- 
2.39.2