linux-kernel - Re: [PATCH v2 2/7] backlight: gpio: simplify the platform data handling

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Message-ID: <CAMRc=Mfuvh6byfPhPdB51dy_YbAS5scJQT3n3pL_5VZLCjB3Hw@mail.gmail.com>
Date:   Tue, 23 Jul 2019 08:28:00 +0200
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>,
        Lee Jones <lee.jones@...aro.org>,
        Daniel Thompson <daniel.thompson@...aro.org>,
        Jingoo Han <jingoohan1@...il.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        linux-sh@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        dri-devel@...ts.freedesktop.org, linux-fbdev@...r.kernel.org,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: Re: [PATCH v2 2/7] backlight: gpio: simplify the platform data handling

pon., 22 lip 2019 o 18:06 Andy Shevchenko
<andriy.shevchenko@...ux.intel.com> napisał(a):
>
> On Mon, Jul 22, 2019 at 05:02:57PM +0200, Bartosz Golaszewski wrote:
> > From: Bartosz Golaszewski <bgolaszewski@...libre.com>
> >
> > Now that the last user of platform data (sh ecovec24) defines a proper
> > GPIO lookup and sets the 'default-on' device property, we can drop the
> > platform_data-specific GPIO handling and unify a big chunk of code.
> >
> > The only field used from the platform data is now the fbdev pointer.
>
> > -static int gpio_backlight_probe_dt(struct platform_device *pdev,
> > -                                struct gpio_backlight *gbl)
> > -{
> > -     struct device *dev = &pdev->dev;
> > -     enum gpiod_flags flags;
> > -     int ret;
> > -
> > -     gbl->def_value = device_property_read_bool(dev, "default-on");
> > -     flags = gbl->def_value ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW;
> > -
> > -     gbl->gpiod = devm_gpiod_get(dev, NULL, flags);
> > -     if (IS_ERR(gbl->gpiod)) {
> > -             ret = PTR_ERR(gbl->gpiod);
> > -
> > -             if (ret != -EPROBE_DEFER) {
> > -                     dev_err(dev,
> > -                             "Error: The gpios parameter is missing or invalid.\n");
> > -             }
> > -             return ret;
> > -     }
> > -
> > -     return 0;
> > -}
>
> Why not leave this function (perhaps with different name)?
>
> --
> With Best Regards,
> Andy Shevchenko
>
>

Why would we do that if the entire probe() function is now less than
50 lines long? Also: it gets inlined by the compiler anyway. It
doesn't make sense IMO.

Bart