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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20081212150144.GA28147@oksana.dev.rtsoft.ru \
--to=avorontsov@ru.mvista.com \
--cc=linuxppc-dev@ozlabs.org \
--cc=sfalco@harris.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.