linux-kernel - Re: [PATCH 02/10] mach-u300: rewrite gpio driver, move to drivers/gpio

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Date:	Fri, 20 May 2011 00:52:48 -0600
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	Barry Song <21cnbao@...il.com>,
	Linus Walleij <linus.walleij@...ricsson.com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Lee Jones <lee.jones@...aro.org>,
	Jonas Aaberg <jonas.aberg@...ricsson.com>
Subject: Re: [PATCH 02/10] mach-u300: rewrite gpio driver, move to
 drivers/gpio

On Thu, May 19, 2011 at 02:25:47PM +0200, Linus Walleij wrote:
> On Thu, May 19, 2011 at 1:38 PM, Barry Song <21cnbao@...il.com> wrote:
> 
> >> -arch_initcall(u300_gpio_init);
> >> -module_exit(u300_gpio_exit);
> >>
> > looks like the driver can't be a real module, is the module_exit
> > suitable? it looks strange module_exit plays together with
> > arch_initcall.
> 
> It's a rather common design pattern in the kernel for early
> platform drivers. Either the dependencies are resolved by the
> different initlevels or they are resolved in probe order with
> loadable modules. Module load will call all initlevels in order.
> 
> It is not elegant but it is common.

but it does need to be fixed.  Unfortunately it is not simple.  What
is needed is a generic deferral or ability for drivers to declare
dependences on other devices beyond their immediate parent.

I've thought about this a bit on and off over the last year, but I
haven't actually sat down to try and hack anything out yet.

g.

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