linux-kernel - Re: [PATCH V6 09/11] ACPI: introduce flag .is_master

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Message-ID: <20140522080822.GB1651@lahna.fi.intel.com>
Date:	Thu, 22 May 2014 11:08:22 +0300
From:	Mika Westerberg <mika.westerberg@...ux.intel.com>
To:	Zhang Rui <rui.zhang@...el.com>
Cc:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
	bhelgaas@...gle.com, matthew.garrett@...ula.com,
	rafael.j.wysocki@...el.com, dmitry.torokhov@...il.com
Subject: Re: [PATCH V6 09/11] ACPI: introduce flag .is_master_device

On Wed, May 21, 2014 at 11:09:42PM +0800, Zhang Rui wrote:
> On 三, 2014-05-21 at 13:10 +0200, Rafael J. Wysocki wrote:
> > On Wednesday, May 21, 2014 11:52:07 AM Mika Westerberg wrote:
> > > On Thu, May 15, 2014 at 02:44:14PM +0800, Zhang Rui wrote:
> > > > For some ACPI device objects, they represent master devices,
> > > > and their children devices are enumerated by bus controller drivers
> > > > for the buses they are on.
> > > > 
> > > > In this case, we do not want to enumerate their children devices to
> > > > platform bus explicitly in acpi scan code.
> > > > 
> > > > Thus a new flag .is_master_device is introduced in this patch.
> > > > 
> > > > For devices with this flag set, we will not do default enumeration
> > > > for their children.
> > > 
> > > Is there any particular reason we would like to enumerate everything
> > > below the first device by default?
> > 
> > Yes, there is.  Device objects without _ADR under the PCI host bridge.
> > 
> I'm confused. Mika, what do you mean by saying "first device"?

I mean the first level devices right below the host bridge, such as
\_SB.PCI0.* but not \_SB.PCI0.*.FOO.
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