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

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Message-ID: <20250821-arrange-exhume-aed87b75305c@spud>
Date: Thu, 21 Aug 2025 19:16:03 +0100
From: Conor Dooley <conor@...nel.org>
To: Biju Das <biju.das.jz@...renesas.com>
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

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?

> 
> [1]
> https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/Documentation/devicetree/bindings?h=next-20250820&id=44b91d61c505863b8ae90b7094aee5ca0dce808f
> 
> [2]
> https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/Documentation/devicetree/bindings?h=next-20250820&id=b2d25905366b4e6791f60e6bc76a636d1b88e6f8
> 
> Cheers,
> Biju

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