linux-kernel - Re: [PATCH v2 6/7] clk: Add initial WM831x clock driver

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Date:	Tue, 4 Oct 2011 21:50:02 +0100
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Grant Likely <grant.likely@...retlab.ca>
Cc:	Mike Turquette <mturquette@...com>, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, jeremy.kerr@...onical.com,
	tglx@...utronix.de, linus.walleij@...ricsson.com,
	amit.kucheria@...aro.org, dsaxena@...aro.org, patches@...aro.org,
	linaro-dev@...ts.linaro.org, paul@...an.com, sboyd@...inc.com,
	shawn.guo@...escale.com, skannan@...cinc.com,
	magnus.damm@...il.com, arnd.bergmann@...aro.org,
	linux@....linux.org.uk, eric.miao@...aro.org,
	richard.zhao@...aro.org
Subject: Re: [PATCH v2 6/7] clk: Add initial WM831x clock driver

On Tue, Oct 04, 2011 at 12:18:18PM -0600, Grant Likely wrote:
> On Mon, Sep 26, 2011 at 10:38:58AM +0100, Mark Brown wrote:

> > No, that's not helpful.  The issue isn't the device probe code itself,
> > the issue is things like module unload not doing what they're supposed
> > to do and leaving the device lying around or something - there's rather
> > more going on than just the plain API call.

> Then lets fix the core code.  I see this pattern show up again and
> again of extra boilerplate going around
> platform_driver_{register,unregister}().  That says to me that there
> either needs to be a new helper, or the core code needs to be made
> more verbose.

I'd go with the latter, it's pretty much the approach the subsystems I
help maintain have been taking.  In fast paths it's a bit different but
in slow paths it tends to be helpful to know why things just fell over.

> In fact, I've been considering adding a macro for
> {platform,i2c,spi,...}_drivers that does all the module boilerplate
> for the common case of only registering a driver at init time.
> Something like:

> #define module_platform_driver(__driver) \
> int __driver##_init(void) \
> { \
> 	return platform_driver_register(&(__driver)); \
> } \
> module_init(__driver##_init); \
> void ##__driver##_exit(void) \
> { \
> 	platform_driver_unregister(&(__driver)); \
> } \
> module_exit(##__driver##_exit);

> It's not a lot of code, but I dislike how much boilerplate every
> single driver has to use if it doesn't do anything special.

Yeah, this sort of stuff would be helpful - there's quite a bit of
boilerplate you end up having to write to get drivers going.
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