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

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Message-ID: <ZWdJUBNMYj9qvCf2@smile.fi.intel.com>
Date:   Wed, 29 Nov 2023 16:23:12 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
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

On Wed, Nov 29, 2023 at 03:41:55PM +0200, Andy Shevchenko wrote:
> On Wed, Nov 29, 2023 at 12:21:45PM +0100, Geert Uytterhoeven wrote:
> > 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.

...

> > >  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".
> 
> Hmm... Can it be done later?
> 
> I can, of course try to change the parameter here to be unsigned, but it most
> likely fail the build for those drivers means need more patches, more delay to
> this series.
> 
> Linus?

On the first glance updating API here does not fail the build.
Lemme incorporate this into v4.

Meanwhile the drivers I left untouched, it might be separate changes
to convert from int to const unsigned int.

-- 
With Best Regards,
Andy Shevchenko