From: Ben Gamari <bgamari.foss-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
To: beagleboard <beagleboard-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org>,
linux-omap <linux-omap-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
David Brownell
<dbrownell-Rn4VEauK+AKRv+LV9MX5uipxlwaOVQ5f@public.gmane.org>,
Eric Miao <eric.miao-eYqpPyKDWXRBDgjK7y7TUQ@public.gmane.org>,
Michael Henn
Subject: [RFC PATCH] GPIO chip select support for McSPI
Date: Tue, 21 Dec 2010 12:56:34 -0500 [thread overview]
Message-ID: <1292954195-20204-1-git-send-email-bgamari.foss__28446.0686882541$1292954246$gmane$org@gmail.com> (raw)
In-Reply-To: <1b68c6791001272033q60dd31dbif4de285cd9bac83d-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
As you may recall, about a year ago I wrote wondering whether it was possible
to use GPIO lines as chip selects in the McSPI driver. A few of you pointed out
that this functionality had been added to other drivers and it should be quite
simple to do the same for McSPI. Two semesters then passed without a followup
from me.
Thankfully, classes are over and I've had some downtime due to sickness,
finally freeing up some time to look at this (just in time as we'll soon need
this functionality). This morning I looked through the relevant code and put
together this patch to add support for GPIO CSs. As was suggested, I modelled
this after the approach taken in the s3c24xx-spi driver. Let me know whether
this looks sane. It has yet to see hardware, but in principle things look
alright (famous last words).
Cheers,
- Ben
P.S. In case people are curious to see an example of usage I have a patch
adding support for multiplexed chip selects to support a data acquisition board
for the BeagleBoard that I've been working on[1]. I can send these out if
people are interested.
[1] http://goldnerlab.physics.umass.edu/wiki/BeagleBoardDaq
------------------------------------------------------------------------------
Forrester recently released a report on the Return on Investment (ROI) of
Google Apps. They found a 300% ROI, 38%-56% cost savings, and break-even
within 7 months. Over 3 million businesses have gone Google with Google Apps:
an online email calendar, and document program that's accessible from your
browser. Read the Forrester report: http://p.sf.net/sfu/googleapps-sfnew
next prev parent reply other threads:[~2010-12-21 17:56 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-20 19:47 (no subject) Ben Gamari
2010-01-21 0:04 ` Ben Dooks
2010-01-21 0:04 ` (no subject) Ben Dooks
2010-01-21 0:04 ` Ben Dooks
2010-01-22 15:53 ` Re: Ben Gamari
2010-01-28 4:10 ` McSPI questions pertaining to GPIO chip select support Ben Gamari
[not found] ` <1264651770-sup-5197@ben-laptop>
2010-01-28 4:15 ` Bill Gatliff
2010-01-28 4:25 ` Ben Gamari
2010-01-28 4:27 ` Bill Gatliff
2010-01-28 4:33 ` jassi brar
[not found] ` <1b68c6791001272033q60dd31dbif4de285cd9bac83d-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2010-01-29 0:32 ` Ben Gamari
2010-01-29 1:09 ` jassi brar
[not found] ` <1b68c6791001281709l7d11da30lee486632e85b99cb-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2010-01-29 1:58 ` Ben Gamari
2010-12-21 17:56 ` Ben Gamari [this message]
2010-12-21 17:56 ` [PATCH] mcspi: Add support for GPIO chip select lines Ben Gamari
[not found] ` <1292954195-20204-2-git-send-email-bgamari.foss@gmail.com>
2010-12-23 19:59 ` Tony Lindgren
2010-12-23 21:38 ` Grant Likely
2010-12-23 23:09 ` Ben Gamari
2010-12-24 0:37 ` Grant Likely
2010-12-24 2:27 ` Ben Gamari
2010-12-24 3:28 ` Grant Likely
2010-12-24 6:05 ` Ben Gamari
2011-02-12 8:33 ` Grant Likely
2011-02-13 22:07 ` Ben Gamari
2011-08-30 10:14 ` McSPI questions pertaining to GPIO chip select support Raju Sana
2011-08-30 13:50 ` Ben Gamari
2011-08-30 13:50 ` [PATCH] mcspi: Add support for GPIO chip select lines Ben Gamari
2011-08-30 13:52 ` [PATCH] beagledaq: Hack in cs_gpios Ben Gamari
[not found] ` <1314712343-27367-1-git-send-email-bgamari.foss-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2011-09-05 12:42 ` Raju Sana
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='1292954195-20204-1-git-send-email-bgamari.foss__28446.0686882541$1292954246$gmane$org@gmail.com' \
--to=bgamari.foss-re5jqeeqqe8avxtiumwx3w@public.gmane.org \
--cc=beagleboard-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org \
--cc=dbrownell-Rn4VEauK+AKRv+LV9MX5uipxlwaOVQ5f@public.gmane.org \
--cc=eric.miao-eYqpPyKDWXRBDgjK7y7TUQ@public.gmane.org \
--cc=linux-omap-u79uwXL29TY76Z2rM5mHXA@public.gmane.org \
/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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).