From: Anton Vorontsov <avorontsov@ru.mvista.com>
To: Bill Gatliff <bgat@billgatliff.com>
Cc: Linux/PPC Development <linuxppc-dev@ozlabs.org>
Subject: Re: Trouble specifying dts gpio-leds with GPIO expander chip
Date: Tue, 22 Dec 2009 00:55:44 +0300 [thread overview]
Message-ID: <20091221215544.GA30974@oksana.dev.rtsoft.ru> (raw)
In-Reply-To: <4B2FCF40.3050204@billgatliff.com>
On Mon, Dec 21, 2009 at 01:40:48PM -0600, Bill Gatliff wrote:
[...]
> I'm stumped. Could it be that the startup code is trying to register
> the heartbeat device before it has registered the MAX7314, so it doesn't
> know yet that the GPIO line exists?
>
> Anyone have any suggestions?
drivers/gpio/pca953x.c doesn't register itself with the
OF GPIO infrastructure (plus the driver has an absolutely
bogus linux,gpio-base stuff, heh).
As an example of how to do the OF GPIO properly, see
arch/powerpc/platforms/83xx/mcu_mpc8349emitx.c:mcu_gpiochip_add().
Though, soon there will be an easier way to register I2C/SPI chips
with the OF GPIO infrastructure.
Thanks,
--
Anton Vorontsov
email: cbouatmailru@gmail.com
irc://irc.freenode.net/bd2
next prev parent reply other threads:[~2009-12-21 21:55 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-12-21 19:40 Trouble specifying dts gpio-leds with GPIO expander chip Bill Gatliff
2009-12-21 21:55 ` Anton Vorontsov [this message]
2009-12-31 17:00 ` Bill Gatliff
2009-12-21 22:32 ` Grant Likely
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