linux-kernel - Re: [PATCH 2/2] spi: devicetree: add support for loopback mode

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Message-Id: <20121216211415.0DE793E0BDD@localhost>
Date:	Sun, 16 Dec 2012 21:14:14 +0000
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Felipe Balbi <balbi@...com>
Cc:	Felipe Balbi <balbi@...com>,
	spi-devel-general@...ts.sourceforge.net, rob@...dley.net,
	rob.herring@...xeda.com, devicetree-discuss@...ts.ozlabs.org,
	Linux OMAP Mailing List <linux-omap@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Tony Lindgren <tony@...mide.com>
Subject: Re: [PATCH 2/2] spi: devicetree: add support for loopback mode

On Sat, 15 Dec 2012 16:55:46 +0200, Felipe Balbi <balbi@...com> wrote:
> On Sat, Dec 15, 2012 at 12:32:24AM +0000, Grant Likely wrote:
> > On Wed, 12 Dec 2012 10:46:00 +0200, Felipe Balbi <balbi@...com> wrote:
> > > there are a few spi master drivers which make
> > > use of that flag but there is no way to pass it
> > > through devicetree.
> > > 
> > > This patch just creates a way to pass SPI_LOOP
> > > via devicetree.
> > 
> > I don't understand how this would be useful since loopback mode is
> > really just a test feature. Is there any reason to do loopback for
> > something other than test?
> > 
> > I think it would be better to add a sysfs or debugfs property to
> > manipulate the SPI_LOOP flag from userspace. What do you think?
> 
> might be nicer in the long run, indeed. Want me to look into it, or do
> you wanna do it yourself ?

Yes, please look into it. After all, you're the one who needs the feature/  :-)

g.

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