Re: [PATCH 2/9] dt-bindings: phy: bcm-ns-usb3-phy: Describe the NSP variant

[Rob Herring <robh@kernel.org>]

On Wed, Oct 21, 2026 at 10:28:11AM -0700, Florian Fainelli wrote:
> Northstar Plus uses the Northstar Bx PHY register sequence but also
> requires coordinated USB2 and USB3 core resets and a USB2 IDM interface
> clock enable.
> 
> Add an NSP compatible with a required USB2 DMP phandle. Describe the
> shared PHY relationship with EHCI, OHCI and xHCI so initialization
> finishes before any host starts operating.
> 
> Signed-off-by: Florian Fainelli <florian.fainelli@broadcom.com>
> ---
>  .../bindings/phy/bcm-ns-usb3-phy.yaml         | 23 +++++++++++++++++++
>  1 file changed, 23 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/phy/bcm-ns-usb3-phy.yaml b/Documentation/devicetree/bindings/phy/bcm-ns-usb3-phy.yaml
> index 7fd419db45d0..00d69b86cbff 100644
> --- a/Documentation/devicetree/bindings/phy/bcm-ns-usb3-phy.yaml
> +++ b/Documentation/devicetree/bindings/phy/bcm-ns-usb3-phy.yaml
> @@ -14,6 +14,9 @@ description: |
>    Known B1: BCM4707 rev 6
>    Known C0: BCM47094 rev 0
>  
> +  Northstar Plus uses the Bx programming sequence, with coordinated USB2 and
> +  USB3 resets. Its PHY is shared by the EHCI, OHCI and xHCI controllers.
> +
>  maintainers:
>    - Rafał Miłecki <rafal@milecki.pl>
>  
> @@ -22,6 +25,7 @@ properties:
>      enum:
>        - brcm,ns-ax-usb3-phy
>        - brcm,ns-bx-usb3-phy
> +      - brcm,nsp-usb3-phy
>  
>    reg:
>      description: address of MDIO bus device
> @@ -32,6 +36,13 @@ properties:
>      description:
>        Phandle to the DMP (Device Management Plugin) syscon
>  
> +  usb2-dmp-syscon:

brcm,usb2-dmp

> +    $ref: /schemas/types.yaml#/definitions/phandle
> +    description:
> +      Phandle to the USB2 DMP on Northstar Plus, for its interface clock and
> +      reset. All USB host controllers must reference this shared PHY so that
> +      initialization completes before any of them starts using it.
> +
>    "#phy-cells":
>      const: 0
>  
> @@ -41,6 +52,18 @@ required:
>    - usb3-dmp-syscon
>    - "#phy-cells"
>  
> +allOf:
> +  - if:
> +      properties:
> +        compatible:
> +          const: brcm,nsp-usb3-phy
> +    then:
> +      required:
> +        - usb2-dmp-syscon
> +    else:
> +      properties:
> +        usb2-dmp-syscon: false
> +
>  additionalProperties: false
>  
>  examples:
> -- 
> 2.53.0
>