linux-kernel - RE: [PATCH 06/11] dt-bindings: usb: Document Renesas RZ/G3E USB3HOST

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Message-ID:
 <TY3PR01MB113463A076C2122107764660A863DA@TY3PR01MB11346.jpnprd01.prod.outlook.com>
Date: Fri, 22 Aug 2025 06:48:07 +0000
From: Biju Das <biju.das.jz@...renesas.com>
To: Conor Dooley <conor@...nel.org>
CC: biju.das.au <biju.das.au@...il.com>, Greg Kroah-Hartman
	<gregkh@...uxfoundation.org>, Rob Herring <robh@...nel.org>, Krzysztof
 Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, Geert
 Uytterhoeven <geert+renesas@...der.be>, magnus.damm <magnus.damm@...il.com>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-renesas-soc@...r.kernel.org" <linux-renesas-soc@...r.kernel.org>,
	Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: RE: [PATCH 06/11] dt-bindings: usb: Document Renesas RZ/G3E USB3HOST

Hi Conor,

> -----Original Message-----
> From: Conor Dooley <conor@...nel.org>
> Sent: 21 August 2025 19:16
> Subject: Re: [PATCH 06/11] dt-bindings: usb: Document Renesas RZ/G3E USB3HOST
> 
> On Thu, Aug 21, 2025 at 07:15:59AM +0000, Biju Das wrote:
> > Hi Conor,
> >
> > Thanks for the feedback.
> >
> > > -----Original Message-----
> > > From: Conor Dooley <conor@...nel.org>
> > > Sent: 20 August 2025 21:11
> > > Subject: Re: [PATCH 06/11] dt-bindings: usb: Document Renesas RZ/G3E
> > > USB3HOST
> > >
> > > On Wed, Aug 20, 2025 at 06:17:53PM +0100, Biju wrote:
> > > > From: Biju Das <biju.das.jz@...renesas.com>
> > > >
> > > > Document the Renesas RZ/G3E USB3.2 Gen2 Host Controller (a.k.a USB3HOST).
> > > > The USB3HOST is compliant with the Universal Serial Bus 3.2
> > > > Specification Revision 1.0.
> > > >  - Supports 1 downstream USB receptacles
> > > >      - Number of SSP Gen2 or SS ports: 1
> > > >      - Number of HS or FS or LS ports: 1
> > > >  - Supports Super Speed Plus Gen2x1 (10 Gbps), Super Speed (5 Gbps),
> > > >    High Speed (480 Mbps), Full Speed (12Mbps), and Low Speed (1.5 Mbps).
> > > >  - Supports all transfer-types: Control, Bulk, Interrupt, Isochronous, and
> > > >    these split-transactions.
> > > >  - Supports Power Control and Over Current Detection.
> > > >
> > > > Signed-off-by: Biju Das <biju.das.jz@...renesas.com>
> > > > Reviewed-by: Lad Prabhakar
> > > > <prabhakar.mahadev-lad.rj@...renesas.com>
> > >
> > > > +---
> > > > +$id: http://devicetree.org/schemas/usb/renesas,rzg3e-xhci.yaml#
> > >
> > > > +    const: renesas,r9a09g047-xhci
> > >
> > > How come these don't match? I don't understand your naming scheme at all, so idk which is even
> correct!
> >
> > r9a09g047 is SoC part number which also known as RZ/G3E SoC.
> >
> > I just followed the convention used in [1] and [2].
> > Please let me know I should change rzg3e-xhci.yaml->r9a09g047-xhci.yaml ?
> 
> What's the benefit of using that instead of the compatible, other than confusing me?

I guess, for an end user it will be useful to locate the document easily without any issue

Given a choice to locate a document rzg3e-xhci.yaml vs r9a09g047-xhci.yaml which one you prefer
for RZ/G3E XHCI IP?

Cheers,
Biju