From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756215AbbCMRDx (ORCPT ); Fri, 13 Mar 2015 13:03:53 -0400 Received: from mail-pa0-f44.google.com ([209.85.220.44]:33183 "EHLO mail-pa0-f44.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753897AbbCMRDT (ORCPT ); Fri, 13 Mar 2015 13:03:19 -0400 From: Kevin Hilman To: Daniel Lezcano Cc: lorenzo.pieralisi@arm.com, rjw@rjwysocki.net, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, Catalin.Marinas@arm.com, robherring2@gmail.com, arnd@arndb.de, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, lina.iyer@linaro.org Subject: Re: [PATCH 0/6] ARM: cpuidle: Unify the ARM64/ARM DT approach References: <1425385777-14766-1-git-send-email-daniel.lezcano@linaro.org> Date: Fri, 13 Mar 2015 10:03:16 -0700 In-Reply-To: <1425385777-14766-1-git-send-email-daniel.lezcano@linaro.org> (Daniel Lezcano's message of "Tue, 3 Mar 2015 13:29:31 +0100") Message-ID: <7hfv98vnhn.fsf@deeprootsystems.com> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Daniel Lezcano writes: > There is a big number of cpuidle drivers for the ARM architecture. > > These drivers have been cleaned up and grouped into the drivers/cpuidle > directory to keep track of the changes more easily and ensure the code > is following the same scheme across the drivers. > > That had the benefit of simplifying the code and factor out a lot of common > parts. Beside that, as the drivers belong to the 'drivers' directory, we had > to split the arch specific bits and the generic code in order to keep > everything self contained. The platform driver paradigm was used for this > purpose. > > Unfortunately, this approach is now no longer accepted and a different solution > must be provided to reach the same goal: one example is the Qualcomm cpuidle > driver upstreaming attempt [1]. > > In the meantime, ARM64 developed a generic cpuidle driver based on DT definition. > > The DT definition provides an 'enable-method' to specify one of the cpu > operations (PSCI, ...). > > This patchset unify this driver with ARM32, using the same DT definition. > > Thanks with this patchset we can use the 'enable-method' to specify a cpu > operations, hence get rid of the platform driver approach and go further in the > cpuidle driver flexibility via the DT. I really like that these two are unified now. Acked-by: Kevin Hilman