linux-kernel - Re: [PATCH 1/3] MFD: introduce lpc

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Message-ID: <20100216182947.61f0e6ff@hyperion.delvare>
Date:	Tue, 16 Feb 2010 18:29:47 +0100
From:	Jean Delvare <khali@...ux-fr.org>
To:	"Pan, Jacob jun" <jacob.jun.pan@...el.com>
Cc:	Samuel Ortiz <sameo@...ux.intel.com>,
	Denis Turischev <denis@...pulab.co.il>,
	LKML <linux-kernel@...r.kernel.org>,
	David Brownell <dbrownell@...rs.sourceforge.net>,
	"linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>
Subject: Re: [PATCH 1/3] MFD: introduce lpc_sch for Intel SCH LPC bridge

On Tue, 16 Feb 2010 09:19:58 -0800, Pan, Jacob jun wrote:
> >That shouldn't be a problem. The PCI device is still present, so
> >sensors-detect will see it. Then it will load the required driver, and
> >that driver will instantiate i2c adapters. The script then probes all
> >i2c adapters regardless of who created them, so the exact driver
> >implementation doesn't matter.
> >
> [[JPAN]] thanks for explaining it, all made sense to me. looking at
> sensors-detect, it will still load isch driver for the same pci id.
> but how would it know it depends on the new lpc driver to set up resources?
> i can't see shared symbols.
> 
> 	}, {
> 		vendid	=> 0x8086,
> 		devid	=> 0x8119,
> 		procid	=> "Intel SCH",
> 		driver	=> "i2c-isch",
> 	},

On systems with udev, I would expect the mfd driver to load
automatically through module aliases, so this should be OK. Actually,
even i2c-isch should load automatically if we setup proper aliases for
the platform devices it instantiates. For other systems, indeed, the
mfd driver won't load in the absence of a shared symbol. Might be worth
adding request_module() call in platform drivers? If this isn't
acceptable for whatever reason, I can certainly hack sensors-detect to
treat this uncommon case properly, but solving this problem at the
application level seems wrong.

-- 
Jean Delvare
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