linux-kernel - Re: [PATCH v1 3/4] usb: dwc3: Add Google SoC USB PHY driver

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Message-ID: <CA+zupgz-RQ=vNCBTy5yaaP9xJFpeFw+xLJYuvtjct6iuh6zD2g@mail.gmail.com>
Date: Tue, 7 Oct 2025 11:57:55 -0700
From: Roy Luo <royluo@...gle.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: 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>, 
	Thinh Nguyen <Thinh.Nguyen@...opsys.com>, Philipp Zabel <p.zabel@...gutronix.de>, 
	Peter Griffin <peter.griffin@...aro.org>, André Draszik <andre.draszik@...aro.org>, 
	Tudor Ambarus <tudor.ambarus@...aro.org>, Joy Chakraborty <joychakr@...gle.com>, 
	Naveen Kumar <mnkumar@...gle.com>, linux-phy@...ts.infradead.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-usb@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
	linux-samsung-soc@...r.kernel.org
Subject: Re: [PATCH v1 3/4] usb: dwc3: Add Google SoC USB PHY driver

On Mon, Oct 6, 2025 at 10:51 PM Greg Kroah-Hartman
<gregkh@...uxfoundation.org> wrote:
>
> On Mon, Oct 06, 2025 at 11:21:24PM +0000, Roy Luo wrote:
> > Support the USB PHY found on Google Tensor SoCs.
>
> That's great, but that's not what your subject line says (it says "usb:
> dwc3")

Will change the title prefix to phy in the next patchset.

>
> > This particular USB PHY supports both high-speed and super-speed
> > operations, and is paired with the SNPS DWC3 controller that's also
> > integrated on the SoCs.
> > This initial patch specifically adds functionality for high-speed.
> >
> > Co-developed-by: Joy Chakraborty <joychakr@...gle.com>
> > Signed-off-by: Joy Chakraborty <joychakr@...gle.com>
> > Co-developed-by: Naveen Kumar <mnkumar@...gle.com>
> > Signed-off-by: Naveen Kumar <mnkumar@...gle.com>
> > Signed-off-by: Roy Luo <royluo@...gle.com>
> > ---
> >  drivers/phy/Kconfig                 |   1 +
> >  drivers/phy/Makefile                |   1 +
> >  drivers/phy/google/Kconfig          |  15 ++
> >  drivers/phy/google/Makefile         |   2 +
> >  drivers/phy/google/phy-google-usb.c | 286 ++++++++++++++++++++++++++++
>
> And as others said, you don't need a whole new directory for one single
> .c file.
>
> thanks,
>
> greg k-h

The USB phy on Google Tensor G5 is no longer based on Samsung/Exynos
IP, hence we need a new driver for it.
Acknowledge that we don't need a new directory just for one file, will move
it to the drivers/phy directory in the next patchset.

Thanks,
Roy Luo