linux-kernel - Re: [Patch V2 9/9] I2C/ACPI: Add CONFIG_I2C

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Date:	Sat, 17 May 2014 19:48:34 +0200
From:	Wolfram Sang <wsa@...-dreams.de>
To:	Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc:	Lan Tianyu <tianyu.lan@...el.com>, rjw@...ysocki.net,
	awilliam@...hat.com, lenb@...nel.org, linux-i2c@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org
Subject: Re: [Patch V2 9/9] I2C/ACPI: Add CONFIG_I2C_ACPI config

On Tue, Apr 29, 2014 at 11:16:09AM +0300, Mika Westerberg wrote:
> On Mon, Apr 28, 2014 at 10:27:48PM +0800, Lan Tianyu wrote:
> > This patch is to add CONFIG_I2C_ACPI. Current there is a race between
> > removing I2C ACPI operation region and ACPI AML code accessing.
> > So make i2c core built-in if CONFIG_I2C_ACPI is set.
> > 
> > Signed-off-by: Lan Tianyu <tianyu.lan@...el.com>
> > ---
> >  drivers/i2c/Kconfig  | 17 ++++++++++++++++-
> >  drivers/i2c/Makefile |  2 +-
> >  include/linux/i2c.h  |  2 +-
> >  3 files changed, 18 insertions(+), 3 deletions(-)
> > 
> > diff --git a/drivers/i2c/Kconfig b/drivers/i2c/Kconfig
> > index 7b7ea32..c670d49 100644
> > --- a/drivers/i2c/Kconfig
> > +++ b/drivers/i2c/Kconfig
> > @@ -2,7 +2,9 @@
> >  # I2C subsystem configuration
> >  #
> >  
> > -menuconfig I2C
> > +menu "I2C support"
> > +
> > +config I2C
> >  	tristate "I2C support"
> >  	select RT_MUTEXES
> >  	---help---
> > @@ -21,6 +23,17 @@ menuconfig I2C
> >  	  This I2C support can also be built as a module.  If so, the module
> >  	  will be called i2c-core.
> >  
> > +config I2C_ACPI
> > +	bool "I2C ACPI support"
> > +	select I2C
> > +	depends on ACPI
> > +	default y
> > +	help
> > +	  Say Y here if you want to enable I2C ACPI function. ACPI table
> > +	  provides I2C slave devices' information to enumerate these devices.
> > +	  This option also allows ACPI AML code to access I2C slave devices
> > +	  via I2C ACPI operation region to fulfill ACPI method.
> 
> I would prefer something like:
> 
> Say Y here if you want to enable ACPI I2C support. This includes support
> for automatic enumeration of I2C slave devices and support for ACPI I2C
> Operation Regions. Operation Regions allow firmware (BIOS) code to
> access I2C slave devices, such as smart batteries through an I2C host
> controller driver.
> 
> But it is really up to you so,
> 
> Reviewed-by: Mika Westerberg <mika.westerberg@...ux.intel.com>

How does this fit into the context of
55e71edb81b2b45273e7b284cce13ff24bde846f ("i2c: move ACPI helpers into
the core")?


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