linux-kernel - RE: [RFC PATCH 1/6] Introduce acpi_match_device

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Date:	Sat, 29 Sep 2012 13:31:52 +0000
From:	"Zhang, Rui" <rui.zhang@...el.com>
To:	Mika Westerberg <mika.westerberg@...ux.intel.com>
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 1/6] Introduce acpi_match_device_id().



> -----Original Message-----
> From: Mika Westerberg [mailto:mika.westerberg@...ux.intel.com]
> Sent: Friday, September 28, 2012 10:14 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 1/6] Introduce acpi_match_device_id().
> Importance: High
> 
> On Fri, Sep 28, 2012 at 03:38:30PM +0800, Zhang Rui wrote:
> > >From 72df5d1f51fb27a4ba7f70a3b07df759d32b8288 Mon Sep 17 00:00:00
> > >2001
> > From: Zhang Rui <rui.zhang@...el.com>
> > Date: Thu, 27 Sep 2012 15:11:55 +0800
> > Subject: [RFC PATCH 1/6] Introduce acpi_match_device_id().
> >
> > This API is used to check if a device id string is compatible with an
> > ACPI device, either PNP id exported via _HID or compatible ids
> > exported via _CID control method.
> >
> > Signed-off-by: Zhang Rui <rui.zhang@...el.com>
> > ---
> >  drivers/acpi/scan.c     |   22 ++++++++++++++++++++++
> >  include/acpi/acpi_bus.h |    6 ++++++
> >  2 files changed, 28 insertions(+), 0 deletions(-)
> >
> > diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c index
> > d1ecca2..936a7c9 100644
> > --- a/drivers/acpi/scan.c
> > +++ b/drivers/acpi/scan.c
> > @@ -312,6 +312,28 @@ int acpi_match_device_ids(struct acpi_device
> > *device,  }  EXPORT_SYMBOL(acpi_match_device_ids);
> >
> > +int acpi_match_device_id(const struct device *dev, const char *id)
> 
> Would be good idea to implement this in terms of of_match_device() so
> that it returns pointer to the matched id. This way drivers can get the
> ->driver_data pretty easily if needed.
>
Good idea.
Will do that in v2.
 
> > +{
> > +	acpi_handle handle = DEVICE_ACPI_HANDLE(dev);
> 
> If the device is not bound to an ACPI handle this will return NULL. And
> I don't see you doing that in this series meaning that..
> 


You're right, I should set pdev->archdata.acpi_handle to the I2C controller in i2c_root.c.

Thanks,
rui
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