linux-kernel - Re: [PATCH RFC v2 2/5] spmi: Linux driver framework for SPMI

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Date:	Mon, 9 Sep 2013 11:56:04 -0500
From:	Josh Cartwright <joshc@...eaurora.org>
To:	Mark Brown <broonie@...nel.org>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <rob.herring@...xeda.com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-arm-msm@...r.kernel.org,
	Sagar Dharia <sdharia@...eaurora.org>,
	Gilad Avidov <gavidov@...eaurora.org>,
	Michael Bohan <mbohan@...eaurora.org>
Subject: Re: [PATCH RFC v2 2/5] spmi: Linux driver framework for SPMI

Hey Mark-

Thanks for the comments.

On Mon, Sep 09, 2013 at 04:52:24PM +0100, Mark Brown wrote:
> On Fri, Aug 23, 2013 at 11:06:25AM -0500, Josh Cartwright wrote:
> > On Thu, Aug 22, 2013 at 04:10:54PM -0700, Greg Kroah-Hartman wrote:
> > > On Fri, Aug 09, 2013 at 01:37:09PM -0700, Josh Cartwright wrote:
> 
> > > > +	"Example: Read 4 bytes starting at register address 0x1234 for SID 2\n"
> > > > +	"\n"
> > > > +	"echo 0x21234 > address\n"
> > > > +	"echo 4 > count\n"
> > > > +	"cat data\n"
> > > > +	"\n"
> > > > +	"Example: Write 3 bytes starting at register address 0x1008 for SID 1\n"
> > > > +	"\n"
> > > > +	"echo 0x11008 > address\n"
> > > > +	"echo 0x01 0x02 0x03 > data\n"
> > > > +	"\n"
> > > > +	"Note that the count file is not used for writes.  Since 3 bytes are\n"
> > > > +	"written to the 'data' file, then 3 bytes will be written across the\n"
> > > > +	"SPMI bus.\n\n";
> 
> > > The help file within the kernel is a nice touch :)
> 
> > > Or is this only for "debugging"?  If so, please document it as such.
> 
> > It's there because it provides a useful interface for debugging of the
> > controller code, and for simple peek/poke of the slave registers without
> > having a full driver in place.  Will document this.
> 
> This looks awfully like a version of the debugfs interfaces that regmap
> provides, and indeed the entire bus sounds like something that could
> idiomatically be supported via regmap.  Have you considered doing that?
> This would give access to standard tracepoints as well, plus the cache
> infrastructure.

It does indeed look like regmap might work out nicely for SPMI.  I
hadn't seriously considered it just due to a lack of familiarity. I'll
give it a shot and see if I run into any problems.

Thanks,
  Josh

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