linux-kernel - Re: [PATCH v6 2/3] clk: introduce the common clock framework

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Message-ID: <4F5FC090.90005@gmail.com>
Date:	Tue, 13 Mar 2012 16:48:00 -0500
From:	Rob Herring <robherring2@...il.com>
To:	Mike Turquette <mturquette@...aro.org>
CC:	Russell King <linux@....linux.org.uk>,
	Andrew Lunn <andrew@...n.ch>, linaro-dev@...ts.linaro.org,
	Saravana Kannan <skannan@...eaurora.org>,
	Jeremy Kerr <jeremy.kerr@...onical.com>,
	Magnus Damm <magnus.damm@...il.com>,
	linux-arm-kernel@...ts.infradead.org,
	Arnd Bergman <arnd.bergmann@...aro.org>, patches@...aro.org,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Rob Herring <rob.herring@...xeda.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Paul Walmsley <paul@...an.com>,
	Linus Walleij <linus.walleij@...ricsson.com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Stephen Boyd <sboyd@...eaurora.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 2/3] clk: introduce the common clock framework

Mike,

On 03/10/2012 01:54 AM, Mike Turquette wrote:
> The common clock framework defines a common struct clk useful across
> most platforms as well as an implementation of the clk api that drivers
> can use safely for managing clocks.
> 
> The net result is consolidation of many different struct clk definitions
> and platform-specific clock framework implementations.
> 
> This patch introduces the common struct clk, struct clk_ops and an
> implementation of the well-known clock api in include/clk/clk.h.
> Platforms may define their own hardware-specific clock structure and
> their own clock operation callbacks, so long as it wraps an instance of
> struct clk_hw.
> 
> See Documentation/clk.txt for more details.
> 
> This patch is based on the work of Jeremy Kerr, which in turn was based
> on the work of Ben Herrenschmidt.
> 
> Signed-off-by: Mike Turquette <mturquette@...aro.org>
> Signed-off-by: Mike Turquette <mturquette@...com>
> Cc: Russell King <linux@....linux.org.uk>
> Cc: Jeremy Kerr <jeremy.kerr@...onical.com>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Arnd Bergman <arnd.bergmann@...aro.org>
> Cc: Paul Walmsley <paul@...an.com>
> Cc: Shawn Guo <shawn.guo@...escale.com>
> Cc: Sascha Hauer <s.hauer@...gutronix.de>
> Cc: Richard Zhao <richard.zhao@...aro.org>
> Cc: Saravana Kannan <skannan@...eaurora.org>
> Cc: Magnus Damm <magnus.damm@...il.com>
> Cc: Rob Herring <rob.herring@...xeda.com>
> Cc: Mark Brown <broonie@...nsource.wolfsonmicro.com>
> Cc: Linus Walleij <linus.walleij@...ricsson.com>
> Cc: Stephen Boyd <sboyd@...eaurora.org>
> Cc: Amit Kucheria <amit.kucheria@...aro.org>
> Cc: Deepak Saxena <dsaxena@...aro.org>
> Cc: Grant Likely <grant.likely@...retlab.ca>
> Cc: Andrew Lunn <andrew@...n.ch>

snip

> +
> +	/*
> +	 * walk the list of orphan clocks and reparent any that are children of
> +	 * this clock
> +	 */
> +	hlist_for_each_entry(orphan, tmp, &clk_orphan_list, child_node)

In __clk_init, this needs to be hlist_for_each_entry_safe as entries can
be removed.

Rob
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