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

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Date:	Mon, 19 Mar 2012 13:38:04 +0800
From:	Shawn Guo <shawn.guo@...aro.org>
To:	Saravana Kannan <skannan@...eaurora.org>
Cc:	"Turquette, Mike" <mturquette@...com>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Jeremy Kerr <jeremy.kerr@...onical.com>,
	Andrew Lunn <andrew@...n.ch>, Paul Walmsley <paul@...an.com>,
	linaro-dev@...ts.linaro.org,
	Linus Walleij <linus.walleij@...ricsson.com>,
	linux-arm-kernel@...ts.infradead.org, patches@...aro.org,
	Magnus Damm <magnus.damm@...il.com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Stephen Boyd <sboyd@...eaurora.org>,
	linux-kernel@...r.kernel.org,
	Rob Herring <rob.herring@...xeda.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Deepak Saxena <dsaxena@...aro.org>,
	Amit Kucheria <amit.kucheria@...aro.org>,
	Russell King <linux@....linux.org.uk>,
	Thomas Gleixner <tglx@...utronix.de>,
	Richard Zhao <richard.zhao@...aro.org>,
	Shawn Guo <shawn.guo@...escale.com>,
	Arnd Bergman <arnd.bergmann@...aro.org>
Subject: Re: [PATCH v5 3/4] clk: introduce the common clock framework

On Fri, Mar 16, 2012 at 08:23:57PM -0700, Saravana Kannan wrote:
...
> Hi Mike,
> 
> I already took a quick look at the v7 series, but I thought this
> thread has more relevant context for my response. So, responding
> here.
> 
> I'm with Sascha on creating a clk_internal/clk_initializer and
> removing clk_hw. You had asked about the benefits of his suggestion
> in one of the earlier threads. I'm sure I have told some of these
> reasons I don't like clk_hw, but repeating my points here for others
> to chime in.
> 
> I used to be a huge proponent for using macros for clocks in our
> internal tree. All the clocks were constructed using macros (you
> will see it in the history of tree we publish in CAF). They quickly
> became unreadable when you have several hundreds of clocks. The
> biggest problem is that you can't quickly look at a clock's macro
> and figure out what the register offset or bit mask or shift value
> is. Our eyes/brains aren't meant for quickly parsing the commas and
> finding the n-th field or even remembering what the n-th field of
> each macro corresponds to. If it's actually broken out as fields in
> a struct, it's much easier to read. So, long story short, I think
> the well-intentioned helper macros will make code quite unreadable.
> 
While I second the idea of clk_initializer, using macros is not really
the thing to complain.  You can save using those macro helpers by
calling APIs clk_register_*().  But that does not solve the problem,
because those APIs also have a long argument list to fill.

-- 
Regards,
Shawn
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