RE: Using GPIO

From: "Stephen Neuendorffer" <stephen.neuendorffer@xilinx•com>
To: "John Bonesio" <john.bonesio@xilinx•com>,
	"Guillaume Dargaud" <dargaud@lpsc•in2p3.fr>,
	<linuxppc-dev@ozlabs•org>
Subject: RE: Using GPIO
Date: Thu, 15 May 2008 11:56:35 -0700	[thread overview]
Message-ID: <20080515185637.587AF43004B@mail186-sin.bigfish.com> (raw)
In-Reply-To: <20080515183910.6B40A75007E@mail106-va3.bigfish.com>

I don't think the GPIO driver has device tree bindings yet in the driver
for ARCH=3Dpowerpc.

Steve

> -----Original Message-----
> From: linuxppc-dev-bounces+stephen.neuendorffer=3Dxilinx.com@ozlabs•org
[mailto:linuxppc-dev-
> bounces+stephen.neuendorffer=3Dxilinx.com@ozlabs•org] On Behalf Of John
Bonesio
> Sent: Thursday, May 15, 2008 11:39 AM
> To: Guillaume Dargaud; linuxppc-dev@ozlabs•org
> Subject: RE: Using GPIO
>=20
>=20
> Hi Guillaume,
>=20
> If you're using arch/powerpc, my understanding is that
> CONFIG_XILINX_GPIO needs to be enabled as well as having the right
info
> in the dts file.
>=20
> Right now I'll have to defer to others to tell you what's needed in
the
> dts file.
>=20
> If you're using arch/ppc, I believe you just need CONFIG_XILINX_GPIO
> enabled.
>=20
> When the system boots up, you see a message on the console when the
GPIO
> driver initializes.
>=20
> This is not exactly a tutorial. Hopefully this still helps,
>=20
> - John
>=20
> -----Original Message-----
> From: linuxppc-dev-bounces+john.bonesio=3Dxilinx.com@ozlabs•org
> [mailto:linuxppc-dev-bounces+john.bonesio=3Dxilinx.com@ozlabs•org] On
> Behalf Of Guillaume Dargaud
> Sent: Thursday, May 15, 2008 9:35 AM
> To: linuxppc-dev@ozlabs•org
> Subject: Using GPIO
>=20
> Hello all,
> I'm trying to use the Xilinx GPIO from a user program.
> Since I haven't managed to compile their example (simon.c is given
> without a
> makefile), I wanted to try using /dev/gpio...
>=20
> So I added
> /dev/gpio0  c  666  0  0  10  185 -  -  -
> to device_table.txt when I generated my root filesystem with
buildroot,
> but
> apparently this leads nowhere as it's not visible in /proc/devices.
>=20
> Is there some example or tutorial on how to use CONFIG_XILINX_GPIO ?
> Either
> as a device or as API calls...
> --
> Guillaume Dargaud
> http://www.gdargaud.net/
>=20
>=20
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>=20
>=20
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