linux-kernel - Re: [PATCH 2/3] spi / ACPI: add ACPI enumeration support

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Message-ID: <20121105132350.59c6e4d9@endymion.delvare>
Date:	Mon, 5 Nov 2012 13:23:50 +0100
From:	Jean Delvare <khali@...ux-fr.org>
To:	Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc:	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	linux-kernel@...r.kernel.org, lenb@...nel.org,
	rafael.j.wysocki@...el.com, grant.likely@...retlab.ca,
	linus.walleij@...aro.org, ben-linux@...ff.org,
	w.sang@...gutronix.de, mathias.nyman@...ux.intel.com,
	linux-acpi@...r.kernel.org
Subject: Re: [PATCH 2/3] spi / ACPI: add ACPI enumeration support

On Mon, 5 Nov 2012 14:02:19 +0200, Mika Westerberg wrote:
> On Mon, Nov 05, 2012 at 11:56:39AM +0100, Mark Brown wrote:
> > I've got practical systems where there are multiple buses physically
> > connected, though in practice almost always only one is actually used at
> > runtime when it's I2C and SPI there are some systems (usually with other
> > buses) where you might want to use more than one bus.  Not sure those
> > buses will fit in here though.
> 
> Yeah, I just went through DSDT table of one of our machines and found a
> device that actually has two I2CSerialBus connectors (and those are to the
> same controller). What I'm not sure is that is it used to select between
> two different addresses or doest the device really have two physical I2C
> connections.

Neither would make sense from a hardware perspective.

-- 
Jean Delvare
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