linux-kernel - Re: [PATCH RFC v2 3/5] spmi: add generic SPMI controller binding documentation

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Message-ID: <CAJAp7Oi-bPytsLtsppdanOi_p0Y5vfBriGB-B5by7w5Z7SGU-Q@mail.gmail.com>
Date:	Sat, 5 Oct 2013 23:11:36 -0700
From:	Bjorn Andersson <bjorn@...o.se>
To:	Stephen Warren <swarren@...dotorg.org>
Cc:	Josh Cartwright <joshc@...eaurora.org>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <rob.herring@...xeda.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ian.campbell@...rix.com>,
	Kumar Gala <galak@...eaurora.org>,
	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>,
	devicetree@...r.kernel.org
Subject: Re: [PATCH RFC v2 3/5] spmi: add generic SPMI controller binding documentation

On Tue, Aug 27, 2013 at 2:55 PM, Stephen Warren <swarren@...dotorg.org> wrote:
> On 08/27/2013 11:01 AM, Josh Cartwright wrote:
> ...
> cell 0 - address type (0: master, 1: unique ID, 2: group ID, ...)

I think it would make sense to have the master id as a property of the
bus, as you could consider this to indicate different buses and then
usid, gsid and base being part of the reg.

> cell 1 - address value

I did hack up Josh patchset to read a reg touple of <usid, base>
instead of just usid. I stored the second value in the spmi_device
struct for easy access, but maybe it should be done like on
codeaurora; in a resource?
I believe this looks nice, but as I haven't read the mipi spec I
wonder, will there be a case where you don't have an offset/base?
Should it just be made optional?

Can we make the address <usid, [base]> and have the code populate a
resource based on a reg-names property? That way it would be possible
to extend it to support gsid in case we want to (would require
reg-names though).

With the hack to Josh's patchset I quickly ported qpnp-revision and
qpnp-vibrator, and it seems to work quite nicely.

Regards,
Bjorn
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