From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934676AbbI2LFL (ORCPT ); Tue, 29 Sep 2015 07:05:11 -0400 Received: from foss.arm.com ([217.140.101.70]:54610 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934243AbbI2LFD (ORCPT ); Tue, 29 Sep 2015 07:05:03 -0400 Date: Tue, 29 Sep 2015 12:05:27 +0100 From: Lorenzo Pieralisi To: Marc Zyngier Cc: "Rafael J. Wysocki" , Len Brown , "hanjun.guo@linaro.org" , Tomasz Nowicki , Thomas Gleixner , Jason Cooper , Sudeep Holla , Will Deacon , Catalin Marinas , Daniel Lezcano , "linaro-acpi@lists.linaro.org" , "linux-acpi@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" Subject: Re: [PATCH v3 1/7] acpi: Add early device probing infrastructure Message-ID: <20150929110527.GB17577@red-moon> References: <1443451758-22717-1-git-send-email-marc.zyngier@arm.com> <1443451758-22717-2-git-send-email-marc.zyngier@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1443451758-22717-2-git-send-email-marc.zyngier@arm.com> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Sep 28, 2015 at 03:49:12PM +0100, Marc Zyngier wrote: > IRQ controllers and timers are the two types of device the kernel > requires before being able to use the device driver model. > > ACPI so far lacks a proper probing infrastructure similar to the one > we have with DT, where we're able to declare IRQ chips and > clocksources inside the driver code, and let the core code pick it up > and call us back on a match. This leads to all kind of really ugly > hacks all over the arm64 code and even in the ACPI layer. > > In order to allow some basic probing based on the ACPI tables, > introduce "struct acpi_probe_entry" which contains just enough > data and callbacks to match a table, an optional subtable, and > call a probe function. A driver can, at build time, register itself > and expect being called if the right entry exists in the ACPI > table. > > A acpi_probe_device_table() is provided, taking an identifier for > a set of acpi_prove_entries, and iterating over the registered > entries. > > Signed-off-by: Marc Zyngier > --- > drivers/acpi/scan.c | 39 +++++++++++++++++++++++ > include/asm-generic/vmlinux.lds.h | 10 ++++++ > include/linux/acpi.h | 66 +++++++++++++++++++++++++++++++++++++++ Reviewed-by: Lorenzo Pieralisi