linux-kernel - Re: [PATCH v7 1/3] Documentation: common clk API

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Date:	Wed, 21 Mar 2012 19:56:56 +0000
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Saravana Kannan <skannan@...eaurora.org>
Cc:	Tony Lindgren <tony@...mide.com>, Paul Walmsley <paul@...an.com>,
	Nicolas Pitre <nicolas.pitre@...aro.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Arnd Bergmann <arnd@...db.de>,
	linux-arm-kernel@...ts.infradead.org,
	Amit Kucheria <amit.kucheria@...aro.org>,
	linaro-dev@...ts.linaro.org,
	Linus Walleij <linus.walleij@...aro.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	Jeremy Kerr <jeremy.kerr@...onical.com>,
	Mike Turquette <mturquette@...com>,
	Mike Turquette <mturquette@...aro.org>,
	Magnus Damm <magnus.damm@...il.com>,
	Deepak Saxena <dsaxena@...aro.org>, patches@...aro.org,
	Rob Herring <rob.herring@...xeda.com>,
	Russell King <linux@....linux.org.uk>,
	Thomas Gleixner <tglx@...utronix.de>,
	Richard Zhao <richard.zhao@...aro.org>,
	Shawn Guo <shawn.guo@...escale.com>,
	Linus Walleij <linus.walleij@...ricsson.com>,
	Stephen Boyd <sboyd@...eaurora.org>,
	linux-omap@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7 1/3] Documentation: common clk API

On Wed, Mar 21, 2012 at 12:41:41PM -0700, Saravana Kannan wrote:
> On 03/21/2012 12:33 PM, Tony Lindgren wrote:
> >* Mark Brown<broonie@...nsource.wolfsonmicro.com>  [120321 12:11]:

> >>These aren't new APIs, the clock API has been around since forever.

> I disagree. When I say clock API, I mean the actual functions and
> their semantics. Not the existence of a header file.

> The meaning of clk_enable/disable has been changed and they won't
> work without calling clk_prepare/unprepare. So, these are definitely
> new APIs. If it weren't new APIs, then none of the general drivers
> would need to change.

clk_prepare() and clk_unprepare() are already there for any clk.h user
and are stubbed in no matter what, they're really not a meaningful
barrier here.

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