Document the Qualcomm WCD9390/WCD9395 USB SubSystem Altmode/Analog Audio Switch
which is a separate USB SubSystem for Altmode/Analog Audio Switch accessible
over an I2C interface.

Since Audio Headphone and Microphone data path between the Codec and the USB-C Mux
subsystems are external to the IC, it requires a second port to handle USB-C altmode
& orientation switching for Audio Accessory Mode to the Codec SubSystem.

Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
---
 .../bindings/usb/qcom,wcd939x-usbss.yaml           | 99 ++++++++++++++++++++++
 1 file changed, 99 insertions(+)

diff --git a/Documentation/devicetree/bindings/usb/qcom,wcd939x-usbss.yaml b/Documentation/devicetree/bindings/usb/qcom,wcd939x-usbss.yaml
new file mode 100644
index 000000000000..da86b1d119d4
--- /dev/null
+++ b/Documentation/devicetree/bindings/usb/qcom,wcd939x-usbss.yaml
@@ -0,0 +1,99 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/usb/qcom,wcd939x-usbss.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Qualcomm WCD9380/WCD9385 USB SubSystem Altmode/Analog Audio Switch
+
+maintainers:
+  - Neil Armstrong <neil.armstrong@linaro.org>
+
+description: |
+  Qualcomm WCD9390/WCD9395 is a standalone Hi-Fi audio codec IC with a functionally
+  separate USB SubSystem for Altmode/Analog Audio Switch accessible over an I2C interface.
+  The Audio Headphone and Microphone data path between the Codec and the USB-C Mux
+  subsystems are external to the IC, thus requiring DT port-endpoint graph description
+  to handle USB-C altmode & orientation switching for Audio Accessory Mode.
+
+properties:
+  compatible:
+    oneOf:
+      - const: qcom,wcd9390-usbss
+      - items:
+          - const: qcom,wcd9395-usbss
+          - const: qcom,wcd9390-usbss
+
+  reg:
+    maxItems: 1
+
+  reset-gpios: true
+
+  vdd-supply:
+    description: USBSS VDD power supply
+
+  mode-switch:
+    description: Flag the port as possible handle of altmode switching
+    type: boolean
+
+  orientation-switch:
+    description: Flag the port as possible handler of orientation switching
+    type: boolean
+
+  ports:
+    $ref: /schemas/graph.yaml#/properties/ports
+    properties:
+      port@0:
+        $ref: /schemas/graph.yaml#/properties/port
+        description:
+          A port node to link the WCD939x USB SubSystem to a TypeC controller for the
+          purpose of handling altmode muxing and orientation switching.
+
+      port@1:
+        $ref: /schemas/graph.yaml#/properties/port
+        description:
+          A port node to link the WCD939x USB SubSystem to the Codec SubSystem for the
+          purpose of handling USB-C Audio Accessory Mode muxing and orientation switching.
+
+required:
+  - compatible
+  - reg
+  - ports
+
+additionalProperties: false
+
+examples:
+  - |
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        typec-mux@42 {
+            compatible = "qcom,wcd9390-usbss";
+            reg = <0x42>;
+
+            vdd-supply = <&vreg_bob>;
+
+            mode-switch;
+            orientation-switch;
+
+            ports {
+                #address-cells = <1>;
+                #size-cells = <0>;
+
+                port@0 {
+                    reg = <0>;
+                    wcd9390_usbss_sbu: endpoint {
+                        remote-endpoint = <&typec_sbu>;
+                    };
+                };
+                port@1 {
+                    reg = <1>;
+                    wcd9390_usbss_codec: endpoint {
+                        remote-endpoint = <&wcd9390_codec_usbss>;
+                    };
+                };
+            };
+        };
+    };
+...

-- 
2.34.1

On 08/12/2023 16:27, Neil Armstrong wrote:
> Document the Qualcomm WCD9390/WCD9395 USB SubSystem Altmode/Analog Audio Switch
> which is a separate USB SubSystem for Altmode/Analog Audio Switch accessible
> over an I2C interface.
> 
> Since Audio Headphone and Microphone data path between the Codec and the USB-C Mux
> subsystems are external to the IC, it requires a second port to handle USB-C altmode
> & orientation switching for Audio Accessory Mode to the Codec SubSystem.
> 
> Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
> ---
>  .../bindings/usb/qcom,wcd939x-usbss.yaml           | 99 ++++++++++++++++++++++
>  1 file changed, 99 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/usb/qcom,wcd939x-usbss.yaml b/Documentation/devicetree/bindings/usb/qcom,wcd939x-usbss.yaml
> new file mode 100644
> index 000000000000..da86b1d119d4
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/usb/qcom,wcd939x-usbss.yaml
> @@ -0,0 +1,99 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/usb/qcom,wcd939x-usbss.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Qualcomm WCD9380/WCD9385 USB SubSystem Altmode/Analog Audio Switch
> +
> +maintainers:
> +  - Neil Armstrong <neil.armstrong@linaro.org>
> +
> +description: |

Do not need '|' unless you need to preserve formatting.

> +  Qualcomm WCD9390/WCD9395 is a standalone Hi-Fi audio codec IC with a functionally
> +  separate USB SubSystem for Altmode/Analog Audio Switch accessible over an I2C interface.

Please wrap at 80. In other descriptions as well.

> +  The Audio Headphone and Microphone data path between the Codec and the USB-C Mux
> +  subsystems are external to the IC, thus requiring DT port-endpoint graph description
> +  to handle USB-C altmode & orientation switching for Audio Accessory Mode.
> +
> +properties:
> +  compatible:
> +    oneOf:
> +      - const: qcom,wcd9390-usbss
> +      - items:
> +          - const: qcom,wcd9395-usbss
> +          - const: qcom,wcd9390-usbss
> +
> +  reg:
> +    maxItems: 1
> +
> +  reset-gpios: true

This is the only GPIO from common GPIOs which actually needs maxItems.
Please add maxItems: 1



Best regards,
Krzysztof