linux-kernel - Re: [PATCH v3 04/21] dt-bindings: reset: renesas,rzv2h-usb2phy: Document VBUS

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Message-ID: <20251110-resonate-strict-c3d6c42f3e0d@spud>
Date: Mon, 10 Nov 2025 18:56:31 +0000
From: Conor Dooley <conor@...nel.org>
To: Tommaso Merciai <tommaso.merciai.xr@...renesas.com>
Cc: tomm.merciai@...il.com, linux-renesas-soc@...r.kernel.org,
	biju.das.jz@...renesas.com, Vinod Koul <vkoul@...nel.org>,
	Kishon Vijay Abraham I <kishon@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Fabrizio Castro <fabrizio.castro.jz@...esas.com>,
	Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Peter Rosin <peda@...ntia.se>,
	Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Magnus Damm <magnus.damm@...il.com>, Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-phy@...ts.infradead.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 04/21] dt-bindings: reset: renesas,rzv2h-usb2phy:
 Document VBUS_SEL mux

On Mon, Nov 10, 2025 at 01:08:04PM +0100, Tommaso Merciai wrote:
> Document the 'mux-controller' child node in the Renesas RZ/V2H(P)
> USB2PHY reset binding to support describing the USB VBUS_SEL
> multiplexer as a mux-controller.
> 
> This is required to properly configure the USB PHY VBUS source on
> RZ/V2H(P), RZ/G3E SoCs.
> 
> Signed-off-by: Tommaso Merciai <tommaso.merciai.xr@...renesas.com>
> ---
> v2->v3:
>  - Manipulate mux-controller as an internal node.

Why is it a child node, rather than just putting the cell in the parent
reset node?

>  - Improved commit body.
> 
> v1->v2:
>  - New patch
> 
>  .../bindings/reset/renesas,rzv2h-usb2phy-reset.yaml   | 11 +++++++++++
>  1 file changed, 11 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/reset/renesas,rzv2h-usb2phy-reset.yaml b/Documentation/devicetree/bindings/reset/renesas,rzv2h-usb2phy-reset.yaml
> index c1b800a10b53..03da74ff2d08 100644
> --- a/Documentation/devicetree/bindings/reset/renesas,rzv2h-usb2phy-reset.yaml
> +++ b/Documentation/devicetree/bindings/reset/renesas,rzv2h-usb2phy-reset.yaml
> @@ -37,6 +37,12 @@ properties:
>    '#reset-cells':
>      const: 0
>  
> +  mux-controller:
> +    $ref: /schemas/mux/mux-controller.yaml#
> +    description: Mux controller for USB VBUS source selection.
> +    type: object
> +    unevaluatedProperties: false
> +
>  required:
>    - compatible
>    - reg
> @@ -44,6 +50,7 @@ required:
>    - resets
>    - power-domains
>    - '#reset-cells'
> +  - mux-controller
>  
>  additionalProperties: false
>  
> @@ -58,4 +65,8 @@ examples:
>          resets = <&cpg 0xaf>;
>          power-domains = <&cpg>;
>          #reset-cells = <0>;
> +
> +        mux-controller {
> +          #mux-state-cells = <1>;
> +        };
>      };
> -- 
> 2.43.0
> 

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