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: <CAMuHMdXwJ043PuJnNU=L9+oN05ExjU-Km9CWBoXO9zqAVizByg@mail.gmail.com>
Date:   Mon, 8 Nov 2021 16:40:24 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Cc:     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>,
        Prabhakar <prabhakar.csengg@...il.com>,
        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 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()?

>         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.

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