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Date: Fri, 4 Apr 2014 15:42:44 +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 07:38:14PM +0530, Harini Katakam wrote:
> OK. I understand.
> Can you comment on the case where a decoder is used?
> There is support for adding a decoder where extended slaves can be selected
> through the IP's control register.
> (This is not currently implemented in the driver but will be in the future.)
> How should the driver know whether it is 4 or 16 select lines for example?
> This has to be written to master->num_chipselect.
That's the sort of case where it's useful yes - depending on how the
implementation is done it may be sensible to just have a property
specifying if a decoder is there (if it just changes the encoding in the
register for example).
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