From mboxrd@z Thu Jan 1 00:00:00 1970 From: Scott Wood Subject: Re: [PATCH v6 22/22] of/platform: Defer probes of registered devices Date: Wed, 21 Oct 2015 00:54:05 -0500 Message-ID: <1445406845.701.55.camel@freescale.com> References: <1442844182-27787-1-git-send-email-tomeu.vizoso@collabora.com> <1442844182-27787-23-git-send-email-tomeu.vizoso@collabora.com> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Return-path: Received: from mail-bn1on0131.outbound.protection.outlook.com ([157.56.110.131]:36352 "EHLO na01-bn1-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751912AbbJUFy0 (ORCPT ); Wed, 21 Oct 2015 01:54:26 -0400 In-Reply-To: <1442844182-27787-23-git-send-email-tomeu.vizoso@collabora.com> Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: Tomeu Vizoso Cc: linux-kernel@vger.kernel.org, Rob Herring , Stephen Warren , Javier Martinez Canillas , Greg Kroah-Hartman , Mark Brown , Thierry Reding , Alan Stern , "Rafael J. Wysocki" , linux-arm-kernel@lists.infradead.org, Dmitry Torokhov , devicetree@vger.kernel.org, Linus Walleij , linux-acpi@vger.kernel.org, Arnd Bergmann , linuxppc-dev@lists.ozlabs.org, Hu Mingkai-B21284 On Mon, 2015-09-21 at 16:03 +0200, Tomeu Vizoso wrote: > Instead of trying to match and probe platform and AMBA devices right > after each is registered, delay their probes until device_initcall_sync. > > This means that devices will start probing once all built-in drivers > have registered, and after all platform and AMBA devices from the DT > have been registered already. > > This allows us to prevent deferred probes by probing dependencies on > demand. > > Signed-off-by: Tomeu Vizoso > --- > > Changes in v4: > - Also defer probes of AMBA devices registered from the DT as they can > also request resources. > > drivers/of/platform.c | 11 ++++++++--- > 1 file changed, 8 insertions(+), 3 deletions(-) This breaks arch/powerpc/sysdev/fsl_pci.c. The PCI bus is an OF platform device, and it must be probed before pcibios_init() which is a subsys_initcall(), or else the PCI bus never gets scanned. -Scott