From mboxrd@z Thu Jan  1 00:00:00 1970
From: Mark Brown <broonie@kernel.org>
Subject: Re: [RFC 3/8] mfd:syscon: Introduce claim/read/write/release APIs
Date: Wed, 8 May 2013 16:01:41 +0100
Message-ID: <20130508150141.GA5057@opensource.wolfsonmicro.com>
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To: Arnd Bergmann <arnd@arndb.de>
Cc: Srinivas KANDAGATLA <srinivas.kandagatla@st.com>, dong.aisheng@linaro.org, sameo@linux.intel.com, Rob Landley <rob@landley.net>, Grant Likely <grant.likely@secretlab.ca>, Rob Herring <rob.herring@calxeda.com>, Russell King <linux@arm.linux.org.uk>, Linus Walleij <linus.walleij@linaro.org>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Jiri Slaby <jslaby@suse.cz>, Stuart Menefy <stuart.menefy@st.com>, Shawn Guo <shawn.guo@linaro.org>, Olof Johansson <olof@lixom.net>, Jason Cooper <jason@lakedaemon.net>, Stephen Warren <swarren@nvidia.com>, Maxime Ripard <maxime.ripard@free-electrons.com>, Nicolas Pitre <nico@linaro.org>, Will Deacon <will.deacon@arm.com>, Dave Martin <dave.martin@linaro.org>, Marc Zyngier <marc.zyngier@arm.com>, Viresh Kumar <viresh.kumar@linaro.org>, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree-discuss@lists.ozlabs.org
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On Wed, May 08, 2013 at 04:50:22PM +0200, Arnd Bergmann wrote:

> > In many cases a single syconf register contains bits related to multiple
> > devices, and therefore it need to be shared across multiple drivers at
> > bit level. The same IP block can have different syscon mappings on
> > different SOCs.

> My feeling is that syscon is the wrong place for this functionality,
> since regmap already handles (some of?) these issues. If you need
> additional synchronization, it's probably best to extend regmap
> as needed so other code besides syscon can take advantage of that
> as well.

This sounds like regmap_update_bits() ought to be all that's needed.

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