linux-kernel - RE: [PATCH 3/4] phy: rcar-gen3-usb2: add SoC-specific parameter for dedicated pins

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Date:   Thu, 31 Aug 2017 08:15:52 +0000
From:   Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
CC:     Kishon Vijay Abraham I <kishon@...com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>
Subject: RE: [PATCH 3/4] phy: rcar-gen3-usb2: add SoC-specific parameter for
 dedicated pins

Hi Geert-san,

Thank you for the comments!

> From: Geert Uytterhoeven
> Sent: Thursday, August 31, 2017 4:51 PM
> 
> Hi Shimoda-san,
> 
> On Thu, Aug 31, 2017 at 9:31 AM, Yoshihiro Shimoda
> <yoshihiro.shimoda.uh@...esas.com> wrote:
> > This patch adds SoC-specific parameter to avoid reading/writing
> > specific registers wronly if this driver runs on a SoC which doesn't
> > have dedicated pins (e.g. R-Car D3).
> >
> > Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
> > ---
> >  drivers/phy/renesas/phy-rcar-gen3-usb2.c | 25 ++++++++++++++++++++-----
> >  1 file changed, 20 insertions(+), 5 deletions(-)
> >
> > diff --git a/drivers/phy/renesas/phy-rcar-gen3-usb2.c b/drivers/phy/renesas/phy-rcar-gen3-usb2.c
> > index 4ea9902..28ebc98 100644
> > --- a/drivers/phy/renesas/phy-rcar-gen3-usb2.c
> > +++ b/drivers/phy/renesas/phy-rcar-gen3-usb2.c
> 
> > @@ -400,9 +403,18 @@ static irqreturn_t rcar_gen3_phy_usb2_irq(int irq, void *_ch)
> >  }
> >
> >  static const struct of_device_id rcar_gen3_phy_usb2_match_table[] = {
> > -       { .compatible = "renesas,usb2-phy-r8a7795" },
> > -       { .compatible = "renesas,usb2-phy-r8a7796" },
> > -       { .compatible = "renesas,rcar-gen3-usb2-phy" },
> > +       {
> > +               .compatible = "renesas,usb2-phy-r8a7795",
> > +               .data = (void *)RCAR_GEN3_PHY_HAS_DEDICATED_PINS,
> > +       },
> > +       {
> > +               .compatible = "renesas,usb2-phy-r8a7796",
> > +               .data = (void *)RCAR_GEN3_PHY_HAS_DEDICATED_PINS,
> > +       },
> > +       {
> > +               .compatible = "renesas,rcar-gen3-usb2-phy",
> > +               .data = (void *)RCAR_GEN3_PHY_HAS_DEDICATED_PINS,
> > +       },
> >         { }
> >  };
> 
> Given the generic R-Car Gen3 entry sets RCAR_GEN3_PHY_HAS_DEDICATED_PINS, you
> cannot specify the fallback compatible value of "renesas,rcar-gen3-usb2-phy"
> in the R-Car D3 .dtsi.

I understood it.

> So I'm wondering, does the USB2 PHY still work (with limitations) on R-Car H3
> and M3-W if you drop RCAR_GEN3_PHY_HAS_DEDICATED_PINS?

Yes, the USB PHY still work with limitation (otg capability channel works as
peripheral mode only. Other channels are no limitation).

> If yes, you can drop the flag from the generic entry, and R-Car D3 can specify
> the generic fallback compatible value in its .dtsi, like H3 and M3-W.

I got it. I will fix this patch set.

Best regards,
Yoshihiro Shimoda

> 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