linux-kernel - Re: [PATCH v1 6/8] usb: dwc3: add rk3568 dwc3 support

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Date:   Fri, 25 Feb 2022 12:55:41 -0500
From:   Peter Geis <pgwipeout@...il.com>
To:     Michael Riesch <michael.riesch@...fvision.net>
Cc:     Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Heiko Stuebner <heiko@...ech.de>, linux-usb@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 6/8] usb: dwc3: add rk3568 dwc3 support

On Fri, Feb 25, 2022 at 12:08 PM Michael Riesch
<michael.riesch@...fvision.net> wrote:
>
> Hi Peter,
>
> On 2/25/22 15:54, Peter Geis wrote:
> > The rk3568 dwc3 controller is backwards compatible with the rk3399 dwc3
> > controller.
> > Add support for it to the dwc3-of-simple driver.
> >
> > Signed-off-by: Peter Geis <pgwipeout@...il.com>
> > ---
> >  drivers/usb/dwc3/dwc3-of-simple.c | 4 +++-
> >  1 file changed, 3 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/usb/dwc3/dwc3-of-simple.c b/drivers/usb/dwc3/dwc3-of-simple.c
> > index 9dc6295df6b1..1d52a261af55 100644
> > --- a/drivers/usb/dwc3/dwc3-of-simple.c
> > +++ b/drivers/usb/dwc3/dwc3-of-simple.c
> > @@ -49,7 +49,8 @@ static int dwc3_of_simple_probe(struct platform_device *pdev)
> >        * Some controllers need to toggle the usb3-otg reset before trying to
> >        * initialize the PHY, otherwise the PHY times out.
> >        */
> > -     if (of_device_is_compatible(np, "rockchip,rk3399-dwc3"))
> > +     if (of_device_is_compatible(np, "rockchip,rk3399-dwc3") |
> > +         of_device_is_compatible(np, "rockchip,rk3568-dwc3"))
> >               simple->need_reset = true;
>
> Maybe read this value out the match data...

This is a good idea, thanks!

>
> >       simple->resets = of_reset_control_array_get(np, false, true,
> > @@ -176,6 +177,7 @@ static const struct of_device_id of_dwc3_simple_match[] = {
> >       { .compatible = "hisilicon,hi3670-dwc3" },
> >       { .compatible = "intel,keembay-dwc3" },
> >       { .compatible = "rockchip,rk3399-dwc3" },
> > +     { .compatible = "rockchip,rk3568-dwc3" },
>
> ... so all future variants that are compatible to the rk3399 can share it?
>
> Best regards,
> Michael
>
> >       { .compatible = "sprd,sc9860-dwc3" },
> >       { /* Sentinel */ }
> >  };