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

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Message-ID: <20140522085135.GC1651@lahna.fi.intel.com>
Date:	Thu, 22 May 2014 11:51:35 +0300
From:	Mika Westerberg <mika.westerberg@...ux.intel.com>
To:	Zhang Rui <rui.zhang@...el.com>
Cc:	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 10:43:07PM +0800, Zhang Rui wrote:
> On 三, 2014-05-21 at 11:52 +0300, 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?
> 
> we do not enumerate everything below the first device by default, we
> just enumerate all the devices with _HID.

OK.

> But if a device has _HID and it is enumerated by its parents to a
> separate bus, we need this flag set for its parent.

How about checking if the device has *SerialBus() connector and in such
case skip the device (given that it is not listed in a special list,
like acpi_platform_device_ids)?
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