linux-kernel - Re: [PATCH 10/10] drivers: misc: use module_platform_driver

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Message-Id: <201303152018.09094.arnd@arndb.de>
Date:	Fri, 15 Mar 2013 20:18:08 +0000
From:	Arnd Bergmann <arnd@...db.de>
To:	H Hartley Sweeten <hartleys@...ionengravers.com>
Cc:	Fabio Porcedda <fabio.porcedda@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
	"linux-ide@...r.kernel.org" <linux-ide@...r.kernel.org>,
	"lm-sensors@...sensors.org" <lm-sensors@...sensors.org>,
	"linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
	"linux-fbdev@...r.kernel.org" <linux-fbdev@...r.kernel.org>,
	"Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
	"Hans-Christian Egtvedt" <hans-christian.egtvedt@...el.com>,
	Grant Likely <grant.likely@...retlab.ca>
Subject: Re: [PATCH 10/10] drivers: misc: use module_platform_driver_probe()

On Friday 15 March 2013, H Hartley Sweeten wrote:
> Arnd,
> 
> Ill look at converting the ep93xx pwm driver to the PWM subsystem. The only issue is
> the current driver exposes a sysfs interface that I think is not available in that subsystem.

You can probably keep providing that interface if you have active users.

> >* Regarding the use of module_platform_driver_probe, I'm a little worried about
> >  the interactions with deferred probing. I don't think there are any regressions,
> >  but we should probably make people aware that one cannot return -EPROBE_DEFER
> >  from a platform_driver_probe function.
> 
> The ep93xx pwm driver does not need to use platform_driver_probe(). It can be changed
> to use module_platform_driver() by just moving the .probe to the platform_driver. This
> driver was added before module_platform_driver() was available and I used the
> platform_driver_probe() thinking it would save a couple lines of code.
> 
> I'll change this in a bit. Right now I'm trying to work out why kernel 3.8 is not booting
> on the ep93xx. I had 3.6.6 on my development board and 3.7 works fine but 3.8 hangs
> without uncompressing the kernel.

Ok, thanks!

	Arnd
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