linux-kernel - Re: [PATCH] fb_omap: add gpiolib dependency

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Date:   Fri, 1 Jun 2018 17:10:26 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Tomi Valkeinen <tomi.valkeinen@...com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Linux OMAP Mailing List <linux-omap@...r.kernel.org>,
        linux-fbdev@...r.kernel.org,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] fb_omap: add gpiolib dependency

On Thu, May 31, 2018 at 8:04 AM, Andy Shevchenko
<andy.shevchenko@...il.com> wrote:
> On Thu, May 31, 2018 at 12:49 AM, Arnd Bergmann <arnd@...db.de> wrote:
>
>> drivers/video/fbdev/omap2/omapfb/dss/hdmi5.c: In function 'hdmi_probe_of':
>> drivers/video/fbdev/omap2/omapfb/dss/hdmi5.c:584:2: error: implicit declaration of function 'of_node_put'; did you mean 'node_set'? [-Werror=implicit-function-declaration]
>> drivers/video/fbdev/omap2/omapfb/dss/hdmi4.c: In function 'hdmi_probe_of':
>> drivers/video/fbdev/omap2/omapfb/dss/hdmi4.c:554:2: error: implicit declaration of function 'of_node_put'; did you mean 'node_set'? [-Werror=implicit-function-declaration]
>
>> Rather than fixing up each one individually, this just marks all of it
>> as depending on GPIOLIB.
>
> Hmm... But the OF stuff is not part of GPIOLIB.

The underlying issue is the same though: linux/gpio.h includes a
different set of header files
depending on CONFIG_GPIOLIB being set or not. Without it, we are missing all the
indirect includes from asm-generic/gpio.h that include linux/of.h and
linux/gpio/consumer.h.

        Arnd