From: Anton Vorontsov <avorontsov@ru.mvista.com>
To: "Steven A. Falco" <sfalco@harris.com>
Cc: "linuxppc-dev@ozlabs.org" <linuxppc-dev@ozlabs.org>
Subject: Re: [RFC] Dummy GPIO driver for use with SPI
Date: Fri, 12 Dec 2008 18:01:44 +0300 [thread overview]
Message-ID: <20081212150144.GA28147@oksana.dev.rtsoft.ru> (raw)
In-Reply-To: <4942738A.80609@harris.com>
On Fri, Dec 12, 2008 at 09:22:02AM -0500, Steven A. Falco wrote:
> This patch adds a dummy GPIO driver, which is useful for SPI devices
> that do not have a physical chip select.
Hm. Then you don't need a chip-select, and SPI driver must understand
this case. When SPI controller has no "gpios" property, it should just
ignore any chip-select toggling operations.
As an implementation example you can use this patch:
http://patchwork.ozlabs.org/patch/12499/
grep for "SPI w/o chip-select line."
--
Anton Vorontsov
email: cbouatmailru@gmail.com
irc://irc.freenode.net/bd2
next prev parent reply other threads:[~2008-12-12 15:01 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-12-12 14:22 [RFC] Dummy GPIO driver for use with SPI Steven A. Falco
2008-12-12 15:01 ` Anton Vorontsov [this message]
2008-12-12 16:59 ` Steven A. Falco
2008-12-12 17:14 ` Anton Vorontsov
2008-12-12 17:33 ` Steven A. Falco
2008-12-12 21:39 ` Trent Piepho
2008-12-12 22:46 ` David Gibson
2008-12-16 16:34 ` Anton Vorontsov
2008-12-15 0:12 ` David Gibson
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