linux-kernel - Re: [RFC PATCH] platform: Faciliatate the creation of pseduo-platform busses

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Message-ID: <20100804103714.48ddbe0e@lxorguk.ukuu.org.uk>
Date:	Wed, 4 Aug 2010 10:37:14 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Patrick Pannuto <ppannuto@...eaurora.org>
Cc:	linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
	linux-omap.vger.kernel.org@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...e.de>, damm@...nsource.se,
	lethal@...ux-sh.org, rjw@...k.pl, dtor@...l.ru,
	eric.y.miao@...il.com, netdev@...r.kernel.org
Subject: Re: [RFC PATCH] platform: Faciliatate the creation of
 pseduo-platform busses

> 	(possibly in a header)
> 	#ifdef CONFIG_MY_BUS
> 	#define MY_BUS_TYPE	&my_bus_type
> 	#else
> 	#define MY_BUS_TYPE	NULL
> 	#endif
> 
> /drivers/my_driver.c
> 	static struct platform_driver my_driver = {
> 		.driver	= {
> 			.name	= "my-driver",
> 			.owner	= THIS_MODULE,
> 			.bus	= MY_BUS_TYPE,
> 		},
> 	};
> 
> Which will allow the same driver to easily to used on either
> the platform bus or the newly defined bus type.

At compile time. I suspect there is an argument for having an
"ANY_BUS_TYPE" value for the devices so that you can runtime wildcard
stuff which works whatever sub-bus it is hung off.

> I believe this to be a fairly elegant and simple solution to the
> problem, but humbly RFC

It's exactly what I need to tidy up the SCU IPC devices on the new Intel
MID platforms certainly. It's also a very small patch to achieve it

Alan
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