linux-kernel - Re: [PATCH v2 1/2] dt-bindings: reset: Document RZ/V2H(P) USB2PHY Control

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Message-ID: <20250306-slather-audition-a6b28ba1483e@spud>
Date: Thu, 6 Mar 2025 16:26:32 +0000
From: Conor Dooley <conor@...nel.org>
To: "Lad, Prabhakar" <prabhakar.csengg@...il.com>
Cc: Philipp Zabel <p.zabel@...gutronix.de>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Magnus Damm <magnus.damm@...il.com>, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
	Biju Das <biju.das.jz@...renesas.com>,
	Fabrizio Castro <fabrizio.castro.jz@...esas.com>,
	Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: Re: [PATCH v2 1/2] dt-bindings: reset: Document RZ/V2H(P) USB2PHY
 Control

On Wed, Mar 05, 2025 at 09:35:13PM +0000, Lad, Prabhakar wrote:
> Hi Conor,
> 
> Thank you for the review.
> 
> On Wed, Mar 5, 2025 at 4:26 PM Conor Dooley <conor@...nel.org> wrote:
> >
> > On Wed, Mar 05, 2025 at 12:39:13PM +0000, Prabhakar wrote:
> > > From: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> > >
> > > Add device tree binding document for the Renesas RZ/V2H(P) USB2PHY Control
> > > Device. It mainly controls reset and power down of the USB2.0 PHY (for
> > > both host and function).
> > >
> > > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> > > ---
> > >  .../reset/renesas,rzv2h-usb2phy-ctrl.yaml     | 56 +++++++++++++++++++
> > >  1 file changed, 56 insertions(+)
> > >  create mode 100644 Documentation/devicetree/bindings/reset/renesas,rzv2h-usb2phy-ctrl.yaml
> > >
> > > diff --git a/Documentation/devicetree/bindings/reset/renesas,rzv2h-usb2phy-ctrl.yaml b/Documentation/devicetree/bindings/reset/renesas,rzv2h-usb2phy-ctrl.yaml
> > > new file mode 100644
> > > index 000000000000..ed156a1d3eb3
> > > --- /dev/null
> > > +++ b/Documentation/devicetree/bindings/reset/renesas,rzv2h-usb2phy-ctrl.yaml
> > > @@ -0,0 +1,56 @@
> > > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > > +%YAML 1.2
> > > +---
> > > +$id: http://devicetree.org/schemas/reset/renesas,rzv2h-usb2phy-ctrl.yaml#
> > > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > > +
> > > +title: Renesas RZ/V2H(P) USB2PHY Control
> > > +
> > > +maintainers:
> > > +  - Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> > > +
> > > +description:
> > > +  The RZ/V2H(P) USB2PHY Control mainly controls reset and power down of the
> > > +  USB2.0 PHY.
> > > +
> > > +properties:
> > > +  compatible:
> > > +    const: renesas,r9a09g057-usb2phy-ctrl  # RZ/V2H(P)
> > > +
> > > +  reg:
> > > +    maxItems: 1
> > > +
> > > +  clocks:
> > > +    maxItems: 1
> > > +
> > > +  resets:
> > > +    maxItems: 1
> > > +
> > > +  power-domains:
> > > +    maxItems: 1
> > > +
> > > +  '#reset-cells':
> > > +    const: 0
> > > +
> > > +required:
> > > +  - compatible
> > > +  - reg
> > > +  - clocks
> > > +  - resets
> > > +  - power-domains
> > > +  - '#reset-cells'
> > > +
> > > +additionalProperties: false
> > > +
> > > +examples:
> > > +  - |
> > > +    #include <dt-bindings/clock/renesas,r9a09g057-cpg.h>
> > > +
> > > +    usbphy-ctrl@...30000 {
> >
> > How come your nodename isn't "reset-controller"?
> This is to keep consistency with the other similar IP blocks found on
> Renesas SoCs [0].

That sounds awfully like "it was wrong before, and I want to keep using
the wrong node name"... If you're claiming to be some other class of
device, "ctrl" should really be "controller" like all the other sorts of
controllers ;)

> 
> [0] https://elixir.bootlin.com/linux/v6.14-rc5/source/Documentation/devicetree/bindings/reset/renesas,rzg2l-usbphy-ctrl.yaml#L66
> 
> > Otherwise,
> > Acked-by: Conor Dooley <conor.dooley@...rochip.com>
> >
> > > +        compatible = "renesas,r9a09g057-usb2phy-ctrl";
> > > +        reg = <0x15830000 0x10000>;
> > > +        clocks = <&cpg CPG_MOD 0xb6>;
> > > +        resets = <&cpg 0xaf>;
> > > +        power-domains = <&cpg>;
> > > +        #reset-cells = <0>;
> > > +    };
> > > --
> > > 2.43.0
> > >
> 
> Cheers,
> Prabhakar

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