linux-kernel - Re: [PATCH] usb: gadget: udc: renesas

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Message-ID: <CAMuHMdWvusnNfnfhFVrTR4mF7PeBwXBz9a02KeOw_wfz1_sdOg@mail.gmail.com>
Date: Tue, 29 Jul 2025 11:45:56 +0200
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Johan Hovold <johan@...nel.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, linux-usb@...r.kernel.org, 
	linux-kernel@...r.kernel.org, 
	Linux-Renesas <linux-renesas-soc@...r.kernel.org>
Subject: Re: [PATCH] usb: gadget: udc: renesas_usb3: drop unused module alias

Hi Johan,

On Tue, 29 Jul 2025 at 11:23, Johan Hovold <johan@...nel.org> wrote:
> On Mon, Jul 28, 2025 at 10:56:18AM +0200, Geert Uytterhoeven wrote:
> > On Thu, 24 Jul 2025 at 11:21, Johan Hovold <johan@...nel.org> wrote:
> > > Since commit f3323cd03e58 ("usb: gadget: udc: renesas_usb3: remove R-Car
> > > H3 ES1.* handling") the driver only supports OF probe so drop the unused
> > > platform module alias.
> > >
> > > Signed-off-by: Johan Hovold <johan@...nel.org>
> >
> > While I don't debate the actual change, I would like to comment on
> > the patch description.  The driver only ever supported OF probe.
> > The call to soc_device_match() was just used to override the match
> > data for quirk handling.
>
> The driver initially indeed only supported OF probe, but that changed
> with commit ca02a5af650c ("usb: gadget: udc: renesas_usb3: Use
> of_device_get_match_data() helper") after which the driver could at
> least theoretically also bind based on the platform device name.

Oh right, now I see what you meant.
Yes, in theory the driver could bind before on a legacy platform device,
but it would crash on a NULL-pointer dereference when running on
anything but R-Car H3 ES1.0x ;-)

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds