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Date: Mon, 20 Jul 2009 14:05:34 +0300
From: Andriy Gapon <avg@icyb.net.ua>
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To: Andre Albsmeier <Andre.Albsmeier@siemens.com>
References: <20090717190450.GA4697@curry.mchp.siemens.de>	<4A60D6D1.3050703@elischer.org>	<20090718081011.GA6920@curry.mchp.siemens.de>
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Cc: freebsd-hackers@freebsd.org, Rui Paulo <rpaulo@freebsd.org>,
	Julian Elischer <julian@elischer.org>
Subject: Re: Reading acpi memory from a driver attached to hostb
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on 18/07/2009 17:06 Julian Elischer said the following:
> Andre Albsmeier wrote:
>> But in order to attach to acpi0, I need to say
>>
>> DRIVER_MODULE( eccmon, acpi, eccmon_driver, eccmon_devclass,  NULL,
>> NULL );
>>
>> instead of
>>
>> DRIVER_MODULE( eccmon, hostb, eccmon_driver, eccmon_devclass,  NULL,
>> NULL );
> 
> try both  with different devclass and other args.

Just to expand on Julian's words.
You can create eccmon and e.g. eccmon_acpi such that they are different drivers
(on different buses) in newbus sense, but logically they can share data or
otherwise cooperate.

/sys/dev/cpufreq/ichss.c prior to rev. 177041 used to be like that.

-- 
Andriy Gapon