linux-kernel - Re: [PATCH] clk: Use a separate struct for holding init data.

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Date:	Thu, 26 Apr 2012 02:15:31 -0700 (PDT)
From:	"Saravana Kannan" <skannan@...eaurora.org>
To:	"Sascha Hauer" <s.hauer@...gutronix.de>
Cc:	"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>,
	"Paul Walmsley" <paul@...an.com>,
	"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] clk: Use a separate struct for holding init data.


On Thu, April 26, 2012 1:39 am, Sascha Hauer wrote:
> On Wed, Apr 25, 2012 at 10:58:56PM -0700, Saravana Kannan wrote:
>> Create a struct clk_init_data to hold all data that needs to be passed
>> from
>> the platfrom specific driver to the common clock framework during clock
>> registration. Add a pointer to this struct inside clk_hw.
>>
>> This has several advantages:
>> * Completely hides struct clk from many clock platform drivers and
>> static
>>   clock initialization code that don't care for static initialization of
>>   the struct clks.
>> * For platforms that want to do complete static initialization, it
>> removed
>>   the need to directly mess with the struct clk's fields while still
>>   allowing to statically allocate struct clk. This keeps the code more
>>   future proof even if they include clk-private.h.
>> * Simplifies the generic clk_register() function and allows adding
>> optional
>>   fields in the future without modifying the function signature.
>> * Simplifies the static initialization of clocks on all platforms by
>>   removing the need for forward delcarations or convoluted macros.
>
> Can we please stop messing with the function prototypes? So you prefer
> passing a struct to clk_register which is fine and yes, it may have
> advantages. But do we really need to change the prototype? Why can't we
> just add a new function?

I thought you were using functions that are specific to the clock type and
not the clk_register function. That's pretty much the only reason I left
in the other functions. I was trying to reduce the first level of churn
for people where had already started using the common clock framework.

> I am generally open to do these changes, but we have come to the point
> where people actually want to *use* the clock framework instead of
> rebasing their stuff onto the latest patches.

This is pretty early on in the life of the common clock framework. So, I
don't think this clean up is unjustified. Again, I left the other
functions as is because people might be using it.

-Saravana

-- 
Sent by an employee of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.


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