From: Anton Vorontsov <avorontsov@ru•mvista.com>
To: Stefan Strobl <nst@gersys•de>
Cc: ppc-dev <linuxppc-dev@ozlabs•org>
Subject: Re: MPC52xx simple GPIO support
Date: Tue, 2 Jun 2009 21:15:27 +0400 [thread overview]
Message-ID: <20090602171527.GA8745@oksana.dev.rtsoft.ru> (raw)
In-Reply-To: <4A255B21.8040002@gersys.de>
Hi Stefan,
On Tue, Jun 02, 2009 at 07:02:25PM +0200, Stefan Strobl wrote:
> Hi
> I still don't quite understand how to use the Flattened Device Tree /
> Open Firmware. I see there's a driver (mpc52xx_gpt.c) that supports to
> use the Pins on the GPT as simple GPIOs. I activated it by adding these
> lines to my dts file:
>
> gpt2: timer@620 {
> compatible = "fsl,mpc5200b-gpt-gpio","fsl,mpc5200-gpt-gpio";
> reg = <0x620 0x10>;
> interrupts = <1 11 0>;
> gpio-controller;
> #gpio-cells = <2>;
> };
>
> I can see the appropriate entries in sysfs
> (/sys/devices/f0000000.soc5200/f0000620.timer), but how can I actually
> use these GPIO's now?
For in-kernel usage example you can take a look at:
arch/powerpc/boot/dts/mpc836x_rdk.dts (upm node, notice gpios = <>)
drivers/mtd/nand/fsl_upm.c (of_get_gpio() then gpio_request()).
For userland usage you need to enable CONFIG_GPIO_SYSFS, and then
look into /sys/class/gpio/{gpiochip,export,gpioNNN}.
--
Anton Vorontsov
email: cbouatmailru@gmail•com
irc://irc.freenode.net/bd2
next prev parent reply other threads:[~2009-06-02 17:15 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-06-02 17:02 MPC52xx simple GPIO support Stefan Strobl
2009-06-02 17:15 ` Anton Vorontsov [this message]
2009-06-03 12:42 ` Stefan Strobl
2009-06-03 13:22 ` PWM class? (was: Re: MPC52xx simple GPIO support) Anton Vorontsov
2009-06-03 15:38 ` Jon Smirl
2009-06-03 15:54 ` Trilok Soni
2009-06-11 22:00 ` Grant Likely
2009-06-12 0:37 ` Anton Vorontsov
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