linux-kernel - Re: [PATCH v2 5/5] pinctrl: renesas: pinctrl-rzg2l: Add support to get/set drive-strength and output-impedance-ohms

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Message-ID: <CA+V-a8v6L6eFTVaCNO_gRxs4Yb0RCHyk1mmy7+r+hOp=ukLhBQ@mail.gmail.com>
Date:   Wed, 10 Nov 2021 13:39:57 +0000
From:   "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Biju Das <biju.das.jz@...renesas.com>
Subject: Re: [PATCH v2 5/5] pinctrl: renesas: pinctrl-rzg2l: Add support to
 get/set drive-strength and output-impedance-ohms

Hi Geert,

Thank you for the review.

On Mon, Nov 8, 2021 at 3:40 PM Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
>
> Hi Prabhakar,
>
> On Fri, Oct 29, 2021 at 2:45 PM Lad Prabhakar
> <prabhakar.mahadev-lad.rj@...renesas.com> wrote:
> > RZ/G2L supports two groups of pins Group-A and Group-B. For Group-A
> > pins drive-strength can be configured and for Group-B output-impedance
> > can be configured.
> >
> > This patch splits PIN_CFG_IOLH macro to PIN_CFG_IOLH_A/B and adds
> > support to get/set drive-strength and output-impedance-ohms for the
> > supported pins.
> >
> > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> > Reviewed-by: Biju Das <biju.das.jz@...renesas.com>
>
> Thanks for your patch!
>
> > --- a/drivers/pinctrl/renesas/pinctrl-rzg2l.c
> > +++ b/drivers/pinctrl/renesas/pinctrl-rzg2l.c
>
> > @@ -501,7 +507,7 @@ static int rzg2l_pinctrl_pinconf_get(struct pinctrl_dev *pctldev,
> >         unsigned int arg = 0;
> >         unsigned long flags;
> >         void __iomem *addr;
> > -       u32 port = 0;
> > +       u32 port = 0, reg;
>
> "unsigned int index", for symmetry with rzg2l_pinctrl_pinconf_set()?
>
Agreed.

> >         u32 cfg = 0;
> >         u8 bit = 0;
> >
> > @@ -549,6 +555,24 @@ static int rzg2l_pinctrl_pinconf_get(struct pinctrl_dev *pctldev,
> >                 break;
> >         }
> >
> > +       case PIN_CONFIG_DRIVE_STRENGTH: {
> > +               if (!(cfg & PIN_CFG_IOLH_A))
> > +                       return -EINVAL;
> > +
> > +               reg = rzg2l_read_pin_config(pctrl, port_pin, IOLH(port), bit, IOLH_MASK);
>
> port_pin still under discussion, cfr. my comments for the other
> patches in this series.
>
As discussed in patch 3/5 will drop this.

Cheers,
Prabhakar

> The rest looks good to me, so
> Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>
>
> 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