linux-kernel - RE: [RFC PATCH 5/6] ACPI: Introduce ACPI I2C controller enumeration driver

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Message-ID: <744357E9AAD1214791ACBA4B0B90926322C16F@SHSMSX101.ccr.corp.intel.com>
Date:	Sat, 29 Sep 2012 13:37:53 +0000
From:	"Zhang, Rui" <rui.zhang@...el.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
CC:	LKML <linux-kernel@...r.kernel.org>,
	linux-pm <linux-pm@...ts.linux-foundation.org>,
	linux-i2c <linux-i2c@...r.kernel.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"Len, Brown" <lenb@...nel.org>, "Rafael J. Wysocki" <rjw@...k.pl>,
	Grant Likely <grant.likely@...retlab.ca>,
	Dirk Brandewie <dirk.brandewie@...il.com>
Subject: RE: [RFC PATCH 5/6] ACPI: Introduce ACPI I2C controller enumeration
 driver



> -----Original Message-----
> From: Alan Cox [mailto:alan@...rguk.ukuu.org.uk]
> Sent: Friday, September 28, 2012 8:54 PM
> To: Zhang, Rui
> Cc: LKML; linux-pm; linux-i2c; linux-acpi@...r.kernel.org; Len, Brown;
> Rafael J. Wysocki; Grant Likely; Dirk Brandewie
> Subject: Re: [RFC PATCH 5/6] ACPI: Introduce ACPI I2C controller
> enumeration driver
> Importance: High
> 
> On Fri, 28 Sep 2012 15:40:32 +0800
> Zhang Rui <rui.zhang@...el.com> wrote:
> 
> > >From 6077a62f2865201ab6727ca7d628ee5e43aa57e1 Mon Sep 17 00:00:00
> > >2001
> > From: Zhang Rui <rui.zhang@...el.com>
> > Date: Fri, 24 Aug 2012 15:18:25 +0800
> > Subject: [RFC PATCH 5/6] ACPI: Introduce ACPI I2C controller
> > enumeration  driver
> >
> > This driver is able to
> > 1) enumerate I2C controller via ACPI namespace
> >    and register it as a platform device.
> > 2) enumerate I2C slave devices via ACPI namespace.
> 
> Will this also trigger and work with the ACPI4 based devices that seem
> to have I²C tables that Linux currently doesn't understand (eq some
> GMA600/Oaktrail platforms) ?

I'm not aware of this. I think the answer is probably "No"
because these PNPids are pretty new.
But we can check FADT.revision to make the driver work
on ACPI5 platforms only.

Thanks,
rui