linux-kernel - Re: [PATCH v4 02/13] gpiolib: have a single place of calling set

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Date:   Thu, 23 Jan 2020 11:16:25 +0100
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Kent Gibson <warthog618@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>
Subject: Re: [PATCH v4 02/13] gpiolib: have a single place of calling set_config()

pon., 20 sty 2020 o 09:44 Geert Uytterhoeven <geert@...ux-m68k.org> napisał(a):
>
> Hi Bartosz,
>
> On Tue, Dec 24, 2019 at 1:08 PM Bartosz Golaszewski <brgl@...ev.pl> wrote:
> > From: Bartosz Golaszewski <bgolaszewski@...libre.com>
> >
> > Instead of calling the gpiochip's set_config() callback directly and
> > checking its existence every time - just add a new routine that performs
> > this check internally. Call it in gpio_set_config() and
> > gpiod_set_transitory(). Also call it in gpiod_set_debounce() and drop
> > the check for chip->set() as it's irrelevant to this config option.
> >
> > Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
> > Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>
>

[snip!]

>
> These two lines are not equivalent: the new code no longer uses the
> packed value of mode and arg!
> Hence this leads to subsequent cleanups in commits e5e42ad224a040f9
> ("gpiolib: remove set but not used variable 'config'") and d18fddff061d2796
> ("gpiolib: Remove duplicated function gpio_do_set_config()").
>
> However, what was the purpose of the PIN_CONF_PACKED() translation?
> Why is it no longer needed?
>

Thanks for catching this. I was OoO for a couple days. I'll try to get
through the mail today and address this as well.

Bartosz