[alsa-devel] [PATCH v4 1/4] dt-bindings: soundwire: add slave bindings

[Srinivas Kandagatla]

This patch adds bindings for Soundwire Slave devices that includes how
SoundWire enumeration address and Link ID are used to represented in
SoundWire slave device tree nodes.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla at linaro.org>
---
 .../soundwire/soudwire-controller.yaml        | 75 +++++++++++++++++++
 1 file changed, 75 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/soundwire/soudwire-controller.yaml

diff --git a/Documentation/devicetree/bindings/soundwire/soudwire-controller.yaml b/Documentation/devicetree/bindings/soundwire/soudwire-controller.yaml
new file mode 100644
index 000000000000..91aa6c6d6266
--- /dev/null
+++ b/Documentation/devicetree/bindings/soundwire/soudwire-controller.yaml
@@ -0,0 +1,75 @@
+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/soundwire/soundwire-controller.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: SoundWire Controller Generic Binding
+
+maintainers:
+  - Srinivas Kandagatla <srinivas.kandagatla at linaro.org>
+
+description: |
+  SoundWire busses can be described with a node for the SoundWire controller
+  device and a set of child nodes for each SoundWire slave on the bus.
+
+properties:
+  $nodename:
+    pattern: "^soundwire(@.*|-[0-9a-f])*$"
+
+  "#address-cells":
+    const: 2
+
+  "#size-cells":
+    const: 0
+
+patternProperties:
+  "^.*@[0-9a-f]+$":
+    type: object
+
+    properties:
+      compatible:
+      pattern: "^sdw[0-9][0-9a-f]{4}[0-9a-f]{4}[0-9a-f]{2}$"
+      description:
+	  Is the textual representation of SoundWire Enumeration
+	  address. compatible string should contain SoundWire Version ID,
+	  Manufacturer ID, Part ID and Class ID in order and shall be in
+	  lower-case hexadecimal with leading zeroes.
+	  Valid sizes of these fields are
+	  Version ID is 1 nibble, number '0x1' represents SoundWire 1.0
+	  and '0x2' represents SoundWire 1.1 and so on.
+	  MFD is 4 nibbles
+	  PID is 4 nibbles
+	  CID is 2 nibbles
+	  More Information on detail of encoding of these fields can be
+	  found in MIPI Alliance DisCo & SoundWire 1.0 Specifications.
+
+      reg:
+        maxItems: 1
+        description:
+          Instance ID and Link ID of SoundWire Device Address.
+
+    required:
+      - compatible
+      - reg
+
+examples:
+  - |
+    soundwire at c2d0000 {
+        #address-cells = <2>;
+        #size-cells = <0>;
+        compatible = "qcom,soundwire-v1.5.0";
+        reg = <0x0c2d0000 0x2000>;
+
+        speaker at 1 {
+            compatible = "sdw10217201000";
+            reg = <1 0>;
+        };
+
+        speaker at 2 {
+            compatible = "sdw10217201000";
+            reg = <2 0>;
+        };
+    };
+
+...
-- 
2.21.0