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

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Message-ID: <aRJqfh7p9M3NHfCS@tom-desktop>
Date: Mon, 10 Nov 2025 23:43:37 +0100
From: Tommaso Merciai <tommaso.merciai.xr@...renesas.com>
To: Conor Dooley <conor@...nel.org>
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

Hi Conor,
Thanks for your comment!

On Mon, Nov 10, 2025 at 06:56:31PM +0000, Conor Dooley wrote:
> 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?

Getting "make dt_binding_check errors" [1] in v2
Adding #mux-state-cells = <1> into:

	usb20phyrst: reset-controller@...30000
	usb21phyrst: reset-controller@...40000

Nodes.

Please correct me if I'm wrong.

Thanks & Regards,
Tommaso


[1] https://patchwork.kernel.org/project/linux-renesas-soc/patch/961741af7d4ec945945164759fe0d78bb3cf4d9d.1762354366.git.tommaso.merciai.xr@bp.renesas.com/

> 
> >  - 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
> >