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

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Date:	Tue, 20 Mar 2012 17:47:42 -0600 (MDT)
From:	Paul Walmsley <paul@...an.com>
To:	Sascha Hauer <s.hauer@...gutronix.de>
cc:	Shawn Guo <shawn.guo@...aro.org>,
	Saravana Kannan <skannan@...eaurora.org>,
	Mike Turquette <mturquette@...aro.org>,
	Arnd Bergman <arnd.bergmann@...aro.org>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-arm-msm@...r.kernel.org, Andrew Lunn <andrew@...n.ch>,
	Rob Herring <rob.herring@...xeda.com>,
	Russell King <linux@....linux.org.uk>,
	Jeremy Kerr <jeremy.kerr@...onical.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Shawn Guo <shawn.guo@...escale.com>,
	Jamie Iles <jamie@...ieiles.com>,
	Richard Zhao <richard.zhao@...aro.org>,
	Magnus Damm <magnus.damm@...il.com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Linus Walleij <linus.walleij@...ricsson.com>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Amit Kucheria <amit.kucheria@...aro.org>,
	Deepak Saxena <dsaxena@...aro.org>,
	Grant Likely <grant.likely@...retlab.ca>
Subject: Re: [PATCH 2/2] clk: Move init fields from clk to clk_hw

Hello Sascha

On Tue, 20 Mar 2012, Sascha Hauer wrote:

> [ C99 structure initializer elided ]
> 
> This will make a 4000 line file out of a 500 line file. Now when for
> some reason struct clk_divider changes we end with big patches. If the
> clk core gets a new fancy CLK_ flag which we want to have then again
> we end up with big patches. Then there's also the possibility that
> someone finds out that .lock and .hw.flags are common to all dividers
> and comes up with a #define DEFINE_CLK_DIVIDER again to share common
> fields.

At least we can understand easily what is being changed.  Readability, 
particularly by others not familiar with the clock data, is more important 
to me.

So like Saravana, I too prefer C99 structure initializers.  At least there 
should be a choice.

Quick quiz: in this line below:

imx_clk_divider("foo_clk", "bar_clk", CCM_BASE + 0x20, 0x5, 0x3);

which field is the bitfield shift and which is the bitfield width? :-)


- Paul

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