linux-kernel - Re: [PATCH v2 10/13] pinctrl: renesas: pinctrl-rzg2l: Add support to set pulling up/down the pins

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAMuHMdWwfRvLv9QG2L0orVEFjo88UY45nPFMTs3wEav1TVuWww@mail.gmail.com>
Date: Wed, 22 May 2024 15:14:12 +0200
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Prabhakar <prabhakar.csengg@...il.com>
Cc: Linus Walleij <linus.walleij@...aro.org>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Magnus Damm <magnus.damm@...il.com>, linux-renesas-soc@...r.kernel.org, 
	linux-gpio@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org, Biju Das <biju.das.jz@...renesas.com>, 
	Fabrizio Castro <fabrizio.castro.jz@...esas.com>, 
	Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: Re: [PATCH v2 10/13] pinctrl: renesas: pinctrl-rzg2l: Add support to
 set pulling up/down the pins

Hi Prabhakar,

On Tue, Apr 23, 2024 at 7:59 PM Prabhakar <prabhakar.csengg@...il.com> wrote:
> From: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
>
> Add support to configure bias-disable, bias-pull-up and bias-pull-down
> properties of the pin.
>
> Two new function pointers get_bias_param() and get_bias_val() are
> introduced as the values in PUPD register differ when compared to
> RZ/G2L family and RZ/V2H(P) SoC,
>
> Value | RZ/G2L        | RZ/V2H
> ---------------------------------
> 00b:  | Bias Disabled | Pull up/down disabled
> 01b:  | Pull-up       | Pull up/down disabled
> 10b:  | Pull-down     | Pull-down
> 11b:  | Prohibited    | Pull-up
>
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> ---
> RFC->v2
> - New patch

Thanks for your patch!

> --- a/drivers/pinctrl/renesas/pinctrl-rzg2l.c
> +++ b/drivers/pinctrl/renesas/pinctrl-rzg2l.c
> @@ -1139,6 +1175,25 @@ static int rzg2l_pinctrl_pinconf_get(struct pinctrl_dev *pctldev,
>                 arg = rzg2l_read_pin_config(pctrl, SR(off), bit, SR_MASK);
>                 break;
>
> +       case PIN_CONFIG_BIAS_DISABLE:
> +       case PIN_CONFIG_BIAS_PULL_UP:
> +       case PIN_CONFIG_BIAS_PULL_DOWN: {
> +               if (!(cfg & PIN_CFG_PUPD))
> +                       return -EINVAL;
> +
> +               ret = pctrl->data->get_bias_param(rzg2l_read_pin_config(pctrl,
> +                                                                       PUPD(off),
> +                                                                       bit, PUPD_MASK));

This is rather long, so please split it in two parts, like is done in
other cases in this function:

    arg = rzg2l_read_pin_config(pctrl, PUPD(off), bit, PUPD_MASK);
    ret = pctrl->data->get_bias_param(arg);

> +               if (ret < 0)
> +                       return ret;
> +
> +               if (ret != param)
> +                       return -EINVAL;
> +               /* for PIN_CONFIG_BIAS_PULL_UP/DOWN when enabled we just return 1 */
> +               arg = 1;
> +               break;
> +       }
> +

The rest LGTM.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68korg

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