From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mika Westerberg Subject: Re: [PATCH V6 09/11] ACPI: introduce flag .is_master_device Date: Thu, 22 May 2014 11:51:35 +0300 Message-ID: <20140522085135.GC1651@lahna.fi.intel.com> References: <1400136256-2218-1-git-send-email-rui.zhang@intel.com> <1400136256-2218-10-git-send-email-rui.zhang@intel.com> <20140521085207.GR1651@lahna.fi.intel.com> <1400683387.13930.26.camel@rzhang1-toshiba> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Content-Disposition: inline In-Reply-To: <1400683387.13930.26.camel@rzhang1-toshiba> Sender: linux-kernel-owner@vger.kernel.org To: Zhang Rui Cc: linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org, bhelgaas@google.com, matthew.garrett@nebula.com, rafael.j.wysocki@intel.com, dmitry.torokhov@gmail.com List-Id: linux-acpi@vger.kernel.org On Wed, May 21, 2014 at 10:43:07PM +0800, Zhang Rui wrote: > On =E4=B8=89, 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 drive= rs > > > for the buses they are on. > > >=20 > > > In this case, we do not want to enumerate their children devices = to > > > platform bus explicitly in acpi scan code. > > >=20 > > > Thus a new flag .is_master_device is introduced in this patch. > > >=20 > > > For devices with this flag set, we will not do default enumeratio= n > > > for their children. > >=20 > > Is there any particular reason we would like to enumerate everythin= g > > below the first device by default? >=20 > 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)?