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Date: Fri, 4 Apr 2014 13:46:37 +0100
From: Mark Brown <broonie@...nel.org>
To: Harini Katakam <harinikatakamlinux@...il.com>
Cc: Grant Likely <grant.likely@...aro.org>,
Rob Herring <robh+dt@...nel.org>,
Pawel Moll <pawel.moll@....com>,
Mark Rutland <mark.rutland@....com>,
"ijc+devicetree@...lion.org.uk" <ijc+devicetree@...lion.org.uk>,
Kumar Gala <galak@...eaurora.org>, linux-spi@...r.kernel.org,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>
Subject: Re: [PATCH v2 2/2] devicetree: Add devicetree bindings documentation
for Cadence SPI
On Fri, Apr 04, 2014 at 05:44:23PM +0530, Harini Katakam wrote:
> On Fri, Apr 4, 2014 at 3:39 PM, Mark Brown <broonie@...nel.org> wrote:
> > On Fri, Apr 04, 2014 at 08:30:38AM +0530, Harini Katakam wrote:
> >> This IP can drive 4 slaves.
> >> The CS line to be driven is selected in spi device structure and
> >> that is driven by the software.
> > So why specify this in the binding at all? If the device always has the
> > same number of chip selects it's redundant.
> I'm sorry, I should have explained that better.
> The IP can support upto 4 chip selects.
> The num-cs value here is the number of chip selects actually used on the board.
Why does that need to be configured? Surely the presence of slaves is
enough information.
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