From mboxrd@z Thu Jan  1 00:00:00 1970
From: Boris BREZILLON <boris.brezillon@free-electrons.com>
Subject: Re: [PATCH] ARM: at91: at91sam9x5: sets NPCS0 (PA14) back to GPIO
Date: Fri, 25 Jul 2014 10:45:53 +0200
Message-ID: <20140725104553.403921b1@bbrezillon>
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Cc: Bo Shen <voice.shen@atmel.com>, nicolas.ferre@atmel.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org
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On Fri, 25 Jul 2014 10:27:13 +0200
Ji=C5=99=C3=AD Prchal <jiri.prchal@aksignal.cz> wrote:

[...]
>=20
>=20
> > Could you also paste the content of /sys/kernel/debug/gpio ?
> The /sys/kernel/debug/ is empty.

You have to enable CONFIG_DEBUG_FS in your config and then mount the
debug file system:

#mount -t debugfs dbg /sys/kernel/debug




--=20
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com