linux-kernel - Re: [RFC v1] regulator: core: introduce regulator chain locking scheme

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Message-ID: <20130415155040.GD15837@opensource.wolfsonmicro.com>
Date:	Mon, 15 Apr 2013 16:50:40 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Grygorii Strashko <grygorii.strashko@...com>
Cc:	Liam Girdwood <liam.r.girdwood@...ux.intel.com>,
	linux-kernel@...r.kernel.org,
	Mike Turquette <mturquette@...aro.org>,
	Nishanth Menon <nm@...com>, Tero Kristo <t-kristo@...com>,
	linux-omap <linux-omap@...r.kernel.org>,
	linux-arm <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [RFC v1] regulator: core: introduce regulator chain locking
 scheme

On Mon, Apr 15, 2013 at 04:03:35PM +0300, Grygorii Strashko wrote:

> To achieve this goal:
> - abstract regulator locking out into helper functions;
> - use the root Regulator (which has no supply defined, like regA) in chain to
>   protect the whole chain;
> - implement regulator chain locking scheme as proposed by Thomas Gleixner for CCF
>   re-entrance in https://lkml.org/lkml/2013/3/27/171 and in the similar way as
>   it is done for CCF by Mike Turquette in https://lkml.org/lkml/2013/3/28/512

Split this into separate refactoring and other change commits - one
change per commit.

> In addition, such locking scheme allows to have access to the supplier
> regulator API from inside child's (consumer) regulator API.

I've still not seen any use case articulated for doing this...

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