linux-kernel - Re: [PATCH v5 3/4] clk: introduce the common clock framework

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Message-ID: <20120308232549.GU3852@pengutronix.de>
Date:	Fri, 9 Mar 2012 00:25:49 +0100
From:	Sascha Hauer <s.hauer@...gutronix.de>
To:	"Turquette, Mike" <mturquette@...com>,
	Andrew Lunn <andrew@...n.ch>, Paul Walmsley <paul@...an.com>,
	linaro-dev@...ts.linaro.org,
	Linus Walleij <linus.walleij@...ricsson.com>,
	patches@...aro.org, Stephen Boyd <sboyd@...eaurora.org>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Magnus Damm <magnus.damm@...il.com>,
	linux-kernel@...r.kernel.org,
	Rob Herring <rob.herring@...xeda.com>,
	Richard Zhao <richard.zhao@...aro.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	Deepak Saxena <dsaxena@...aro.org>,
	Saravana Kannan <skannan@...eaurora.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Shawn Guo <shawn.guo@...escale.com>,
	Amit Kucheria <amit.kucheria@...aro.org>,
	Russell King <linux@....linux.org.uk>,
	Jeremy Kerr <jeremy.kerr@...onical.com>,
	Arnd Bergman <arnd.bergmann@...aro.org>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v5 3/4] clk: introduce the common clock framework

On Thu, Mar 08, 2012 at 07:27:39AM +0100, Andrew Lunn wrote:
> > Assuming that some day OMAP code can be refactored to allow for lazy
> > (or at least initcall-based) registration of clocks then perhaps your
> > suggestion can take root.  Which leads me to this question: are there
> > any other platforms out there that require the level of expose to
> > struct clk present in this patchset?  OMAP does, for now, but if that
> > changes then I need to know if others require this as well.
> 
> Hi Mike
> 
> For kirkwood, i use static clk's for all but my root clock. I cannot
> statically know the rate of the root clock, so i have to determine it
> at boot time using heuristics, PCI ID, etc.
> 
> I used statics thinking it would be less code. No idea if it actually
> is, and there is nothing stopping me moving to creating the clocks
> after creating the root clock.

I'd say use the nonstatic ones. I think using the static initializers
will cause us much pain in the future. I've been through several rebases
on the i.MX clock rework and everytime I wish my sed foo would be
better. Now imagine what happens when it turns out that the internal
struct clk layout or the structs for the muxes/dividers/gates have to
be changed. This task is next to impossible when we have thousands of
clocks scattered around the tree.

Sascha


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