linux-kernel - Re: [PATCH] i2c-i801: Add device tree support

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Message-ID: <20120820071306.GA2409@avionic-0098.mockup.avionic-design.de>
Date:	Mon, 20 Aug 2012 09:13:06 +0200
From:	Thierry Reding <thierry.reding@...onic-design.de>
To:	Wolfram Sang <w.sang@...gutronix.de>
Cc:	Jean Delvare <khali@...ux-fr.org>, Ben Dooks <ben-linux@...ff.org>,
	Daniel Kurtz <djkurtz@...omium.org>, linux-i2c@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] i2c-i801: Add device tree support

On Sat, Aug 18, 2012 at 09:01:52PM +0200, Wolfram Sang wrote:
> 
> > > I thought to recall that busses which can be probed at runtime should
> > > not have nodes but should be probed. Maybe that was wrong. Can you point
> > > me to a dts-file with an example?
> > 
> > That approach doesn't work for I2C controllers, though because you
> > couldn't attach an slaves to them. The same goes for SPI controllers or
> > any other dumb busses that can't be probed.
> 
> I understand the problem. I was wondering how it has been solved. Thanks
> for the pointer, I got the idea now.
> 
> > arch/x86/platform/ce4100/falconfalls.dts is an example for an X86
> > platform where PCI devices have associated device tree nodes.
> 
> Do you intend to send a dts file mainline which needs the patch you sent?

Yes. I have an x86 platform which has an lm63 temperature sensor
connected to the i801. There are a couple of loose ends that I need to
take care of before I can send the DTS. I can send it for reference, but
it won't be of much use because other things are still missing from the
kernel and I don't know in what timeframe they can be applied.

Thierry

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