linux-kernel - Re: [PATCH v3 06/22] pinctrl: core: Make pins const in struct group

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Message-ID: <CAMuHMdWt0qq-Umd8udb7fxpNVZ=X9O9eZGMVGFSGRO_d9UkgNw@mail.gmail.com>
Date:   Wed, 29 Nov 2023 12:21:45 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Jonathan Neuschäfer <j.neuschaefer@....net>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>,
        Biju Das <biju.das.jz@...renesas.com>,
        Claudiu Beznea <claudiu.beznea.uj@...renesas.com>,
        Jianlong Huang <jianlong.huang@...rfivetech.com>,
        linux-arm-kernel@...ts.infradead.org, linux-gpio@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mediatek@...ts.infradead.org,
        openbmc@...ts.ozlabs.org, linux-mips@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        Broadcom internal kernel review list 
        <bcm-kernel-feedback-list@...adcom.com>,
        Dong Aisheng <aisheng.dong@....com>,
        Fabio Estevam <festevam@...il.com>,
        Shawn Guo <shawnguo@...nel.org>, Jacky Bai <ping.bai@....com>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        NXP Linux Team <linux-imx@....com>,
        Sean Wang <sean.wang@...nel.org>,
        Paul Cercueil <paul@...pouillou.net>,
        Lakshmi Sowjanya D <lakshmi.sowjanya.d@...el.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Emil Renner Berthing <kernel@...il.dk>,
        Hal Feng <hal.feng@...rfivetech.com>
Subject: Re: [PATCH v3 06/22] pinctrl: core: Make pins const in struct group_desc

Hi Andy,

On Tue, Nov 28, 2023 at 9:04 PM Andy Shevchenko
<andriy.shevchenko@...ux.intel.com> wrote:
> It's unclear why it's not a const from day 1. Make the pins member
> const in struct group_desc. Update necessary APIs.
>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

Thanks for your patch!

> --- a/drivers/pinctrl/core.c
> +++ b/drivers/pinctrl/core.c
> @@ -642,7 +642,7 @@ static int pinctrl_generic_group_name_to_selector(struct pinctrl_dev *pctldev,
>   * Note that the caller must take care of locking.
>   */
>  int pinctrl_generic_add_group(struct pinctrl_dev *pctldev, const char *name,
> -                             int *pins, int num_pins, void *data)
> +                             const int *pins, int num_pins, void *data)
>  {
>         struct group_desc *group;
>         int selector, error;
> diff --git a/drivers/pinctrl/core.h b/drivers/pinctrl/core.h
> index 530370443c19..01ea1ce99fe8 100644
> --- a/drivers/pinctrl/core.h
> +++ b/drivers/pinctrl/core.h
> @@ -203,7 +203,7 @@ struct pinctrl_maps {
>   */
>  struct group_desc {
>         const char *name;
> -       int *pins;
> +       const int *pins;
>         int num_pins;
>         void *data;
>  };
> @@ -222,7 +222,7 @@ struct group_desc *pinctrl_generic_get_group(struct pinctrl_dev *pctldev,
>                                              unsigned int group_selector);
>
>  int pinctrl_generic_add_group(struct pinctrl_dev *pctldev, const char *name,
> -                             int *gpins, int ngpins, void *data);
> +                             const int *pins, int num_pins, void *data);
>
>  int pinctrl_generic_remove_group(struct pinctrl_dev *pctldev,
>                                  unsigned int group_selector);

Probably this is also the right moment to change all of these to arrays
of unsigned ints?  Else you will have mixed int/unsigned int after
"[PATCH v3 13/22] pinctrl: core: Embed struct pingroup into struct
group_desc", and purely unsigned int after "[PATCH v3 22/22] pinctrl:
core: Remove unused members from struct group_desc".

The Renesas pinctrl drivers already pass arrays of unsigned ints.
Some other drivers still use arrays of ints, though.

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