From: Grant Likely <grant.likely@secretlab.ca>
To: Ben Gamari <bgamari.foss@gmail.com>
Cc: linux-omap@vger.kernel.org
Subject: Re: [PATCH] mcspi: Add support for GPIO chip select lines
Date: Mon, 14 Mar 2011 20:10:49 -0600 [thread overview]
Message-ID: <20110315021049.GA12819@angua.secretlab.ca> (raw)
In-Reply-To: <87ipvlm91r.fsf@gmail.com>
On Mon, Mar 14, 2011 at 10:06:40PM -0400, Ben Gamari wrote:
> On Mon, 14 Mar 2011 13:27:18 -0600, Grant Likely <grant.likely@secretlab.ca> wrote:
> > What if the board wanted to use both the native SPI ss line as well as
> > one or more GPIOs? You probably want to reserve cs0 for the native
> > gpio line.
> >
> Hmm, I had thought about this and assumed it would be easiest to punt on
> this, requiring the user to use the native line as a GPIO. This of
> course assumes that all of the CS lines also have pinmux configurations
> as GPIO pins. Is this not a good assumption?
As a general principle I would say no since it would mean adding a 2nd
GPIO device will potentially break the first if the infrastructure
isn't in place to handle the first line as a gpio.
g.
next prev parent reply other threads:[~2011-03-15 2:10 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <c0ffcf4415b8edbf55d653a620b92fbbbcd8fed7>
[not found] ` <1297635034-24504-1-git-send-email-bgamari.foss@gmail.com>
[not found] ` <20110302215026.GA22854@angua.secretlab.ca>
[not found] ` <87sjv517yd.fsf@gmail.com>
[not found] ` <f7a269db-3bcf-4bac-8c38-b363e5c7bd0b@email.android.com>
2011-03-13 19:04 ` GPIO chip select support in McSPI Ben Gamari
2011-03-13 19:05 ` [PATCH] mcspi: Add support for GPIO chip select lines Ben Gamari
2011-03-14 19:27 ` Grant Likely
2011-03-15 2:06 ` Ben Gamari
2011-03-15 2:10 ` Grant Likely [this message]
2011-03-14 19:25 ` GPIO chip select support in McSPI Grant Likely
2011-03-15 2:22 ` Ben Gamari
2011-03-15 3:29 ` Grant Likely
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
-- strict thread matches above, loose matches on Subject: below --
2010-01-28 4:33 McSPI questions pertaining to GPIO chip select support jassi brar
2010-12-21 17:56 ` [PATCH] mcspi: Add support for GPIO chip select lines Ben Gamari
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
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