[PATCH v3 4/6] dt-bindings: sound: Add support for the Lantiq PEF2256 codec

[Herve Codina <herve.codina@bootlin.com>]

The Lantiq PEF2256 is a framer and line interface component designed to
fulfill all required interfacing between an analog E1/T1/J1 line and the
digital PCM system highway/H.100 bus.

The codec support allows to use some of the PCM system highway
time-slots as audio channels to transport audio data over the E1/T1/J1
lines.

Signed-off-by: Herve Codina <herve.codina@bootlin.com>
---
 .../bindings/sound/lantiq,pef2256-codec.yaml  | 54 +++++++++++++++++++
 1 file changed, 54 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/sound/lantiq,pef2256-codec.yaml

diff --git a/Documentation/devicetree/bindings/sound/lantiq,pef2256-codec.yaml b/Documentation/devicetree/bindings/sound/lantiq,pef2256-codec.yaml
new file mode 100644
index 000000000000..da35b70cda99
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/lantiq,pef2256-codec.yaml
@@ -0,0 +1,54 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/lantiq,pef2256-codec.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Lantiq PEF2256 codec
+
+maintainers:
+  - Herve Codina <herve.codina@bootlin.com>
+
+description: |
+  Codec support for PEF2256.
+
+  The Lantiq PEF2256, also known as Infineon PEF2256 or FALC56, is a framer and
+  line interface component designed to fulfill all required interfacing between
+  an analog E1/T1/J1 line and the digital PCM system highway/H.100 bus.
+
+  The codec support allows to use some of the PCM system highway time-slots as
+  audio channels to transport audio data over the E1/T1/J1 lines.
+
+  The time-slots used by the codec must be set and so, the properties
+  'dai-tdm-slot-num', 'dai-tdm-slot-width', 'dai-tdm-slot-tx-mask' and
+  'dai-tdm-slot-rx-mask' must be present in the ALSA sound card node for
+  sub-nodes that involve the codec. The codec uses 8bit time-slots.
+  'dai-tdm-tdm-slot-with' must be set to 8.
+  The tx and rx masks define the PEF2256 time-slots assigned to the codec.
+
+  The PEF2256 codec node should be a child of a PEF2256 node.
+  Refer to the bindings described in
+  Documentation/devicetree/bindings/mfd/lantiq,pef2256.yaml
+
+allOf:
+  - $ref: dai-common.yaml#
+
+properties:
+  compatible:
+    const: lantiq,pef2256-codec
+
+  '#sound-dai-cells':
+    const: 0
+
+required:
+  - compatible
+  - '#sound-dai-cells'
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    codec {
+        compatible = "lantiq,pef2256-codec";
+        #sound-dai-cells = <0>;
+    };
-- 
2.39.2