linux-kernel - Re: [PATCH 2/2] clk: Move init fields from clk to clk

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Message-ID: <20120322032323.GA2213@S2101-09.ap.freescale.net>
Date:	Thu, 22 Mar 2012 11:23:26 +0800
From:	Shawn Guo <shawn.guo@...aro.org>
To:	Sascha Hauer <s.hauer@...gutronix.de>
Cc:	Saravana Kannan <skannan@...eaurora.org>,
	Andrew Lunn <andrew@...n.ch>,
	Grant Likely <grant.likely@...retlab.ca>,
	Jamie Iles <jamie@...ieiles.com>,
	Jeremy Kerr <jeremy.kerr@...onical.com>,
	Mike Turquette <mturquette@...aro.org>,
	Magnus Damm <magnus.damm@...il.com>,
	Deepak Saxena <dsaxena@...aro.org>,
	linux-arm-kernel@...ts.infradead.org,
	Arnd Bergman <arnd.bergmann@...aro.org>,
	linux-arm-msm@...r.kernel.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>,
	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,
	Amit Kucheria <amit.kucheria@...aro.org>
Subject: Re: [PATCH 2/2] clk: Move init fields from clk to clk_hw

On Tue, Mar 20, 2012 at 11:40:21PM +0100, Sascha Hauer wrote:
> On Tue, Mar 20, 2012 at 01:14:51PM -0700, Saravana Kannan wrote:
...
> > Ah, I see. That's a lot of functions calls. I think it would be much
> > more efficient if you just have an array and loop over it. With my
> > patch, you can just call a single register function for all these
> > clocks.
> 
> I was curious and gave it a try. I registered a fixed clock and 100
> gates as child clocks. I tried both DEFINE_CLK_GATE and
> clk_register_gate. It turned out there was no difference in speed.
> 
While there is no difference in speed efficiency, I think we will
gain space efficiency if we can have Saravana's patch to copy the
clk_hw fields and make the static array __initdata as you mentioned.

-- 
Regards,
Shawn
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