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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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