[PATCH v8 2/5] dt-bindings: phy: Add documentation for Airoha AN7581 USB PHY

[Krzysztof Kozlowski]

On Wed, May 20, 2026 at 05:09:07PM +0200, Christian Marangi wrote:
> Add documentation for Airoha AN7581 USB PHY that describe the USB PHY
> for the USB controller.
> 
> Airoha AN7581 SoC support a maximum of 2 USB port. The USB 2.0 mode is
> always supported. The USB 3.0 mode is optional and depends on the Serdes
> mode currently configured on the system for the relevant USB port.
> 
> To correctly calibrate, the USB 2.0 port require correct value in
> "airoha,usb2-monitor-clk-sel" property. Both the 2 USB 2.0 port permit
> selecting one of the 4 monitor clock for calibration (internal clock not
> exposed to the system) but each port have only one of the 4 actually
> connected in HW hence the correct value needs to be specified in DT
> based on board and the physical port. Normally it's monitor clock 1 for
> USB1 and monitor clock 2 for USB2.
> 
> To correctly setup the Serdes mode attached to the USB 3.0 mode, a phys
> property is required with the phandle pointing to the correct Serdes port
> provided by the SCU node.


^^^ here - required but:

> +  phys:
> +    items:
> +      - description: phandle to Serdes PHY
> +
> +  '#phy-cells':
> +    description: The cell contains the mode, PHY_TYPE_USB2 or PHY_TYPE_USB3,
> +      as defined in dt-bindings/phy/phy.h.
> +    const: 1
> +
> +required:
> +  - compatible
> +  - reg
> +  - airoha,usb2-monitor-clk-sel

'phys' is not required? I think you need it to configure the serdes
correctly, no?

> +  - '#phy-cells'
> +
> +additionalProperties: false

Best regards,
Krzysztof