linux-kernel - Re: [PATCH 2/2 v2] Driver core: reduce duplicated code

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Date:	Mon, 28 Jun 2010 07:16:06 +0200
From:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
To:	Eric Miao <eric.y.miao@...il.com>,
	Sascha Hauer <s.hauer@...gutronix.de>
Cc:	Greg KH <greg@...ah.com>, Randy Dunlap <rdunlap@...otime.net>,
	Dmitry Torokhov <dtor@...l.ru>,
	Anisse Astier <anisse@...ier.eu>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Magnus Damm <damm@...nsource.se>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Paul Mundt <lethal@...ux-sh.org>, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH 2/2 v2] Driver core: reduce duplicated code

Hi Eric,

On Mon, Jun 28, 2010 at 12:55:45PM +0800, Eric Miao wrote:
> I suggest you to have a look into arch/arm/mach-mmp/devices.c and
> arch/arm/mach-mmp/pxa{168,910}.c as well as
> arch/arm/mach-mmp/include/mach/pxa{168,910}.h, maybe we can find
> some common practice.
I think I like this approach in general, I already thought about not
passing all parameters as function/macro arguments, too.  But maybe this
becomes too excessive for imx as I would need too many of these device
desc for the different imx variants?!

Anyhow a few things I thought when looking in the files you suggested:

 - Why not use an array for all uart devdescs, maybe the code for
   pxa168_add_uart could become a bit smaller then?:

	extern struct pxa_device_desc pxa168_device_uart[2];
	...
	static inline int pxa168_add_uart(int id)
	{
		struct pxa_device_desc *d = pxa168_device_uart + id;

		if (id < 0 || id > 2)
			return -EINVAL;

		return pxa_register_device(d, NULL, 0);
	}

   (Ditto for the other types obviously.)

 - shouldn't all these pxa_device_descs and pxa168_add_$device functions
   be __initdata and __init?

 - pxa_register_device is better than my add_resndata function in (at
   least) one aspect as it sets coherent_dma_mask, too.  This is
   something I missed when trying to add mxc-mmc (IIRC) devices.

Thanks
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
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