From: Bill Gatliff <bgat@billgatliff.com>
To: Ayman El-Khashab <ayman@elkhashab.com>
Cc: linuxppc-dev@ozlabs.org
Subject: Re: How to set GPIO state in the dts or in platform
Date: Tue, 05 Jan 2010 22:38:50 -0600 [thread overview]
Message-ID: <4B4413DA.7010704@billgatliff.com> (raw)
In-Reply-To: <4B440EDC.3060805@elkhashab.com>
Ayman El-Khashab wrote:
> I've got a custom board akin to the walnut. I've successfully got
> u-boot,
> the kernel, and a working filesystem. The only thing I lack is a
> clear idea
> of how to set a GPIO.
Isn't that the "flags" parameter, e.g.:
gpios = <phandle gpioid flags>
?
If you are passing a 0 for the flags, try a 1. I know of at least one
driver that interprets that to mean a polarity inversion. Maybe you'll
get lucky. :)
b.g.
--
Bill Gatliff
Embedded systems training and consulting
http://billgatliff.com
bgat@billgatliff.com
next prev parent reply other threads:[~2010-01-06 4:38 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-06 4:17 How to set GPIO state in the dts or in platform Ayman El-Khashab
2010-01-06 4:38 ` Bill Gatliff [this message]
2010-01-06 5:08 ` Ayman El-Khashab
2010-01-06 15:16 ` Bill Gatliff
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