Re: [PATCH v2 2/2] devicetree: Add devicetree bindings documentation for Cadence SPI

From: Mark Brown
Date: Fri Apr 04 2014 - 08:47:26 EST

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@xxxxxxxxxx> 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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