From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756081Ab2GCKYG (ORCPT ); Tue, 3 Jul 2012 06:24:06 -0400 Received: from ogre.sisk.pl ([193.178.161.156]:50752 "EHLO ogre.sisk.pl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752042Ab2GCKYD (ORCPT ); Tue, 3 Jul 2012 06:24:03 -0400 From: "Rafael J. Wysocki" To: Linux PM list Subject: [PATCH 0/2] PM / Domains: Allow drivers to attach PM domain callbacks to devices at any time Date: Tue, 3 Jul 2012 12:27:45 +0200 User-Agent: KMail/1.13.6 (Linux/3.5.0-rc5+; KDE/4.6.0; x86_64; ; ) Cc: LKML , Magnus Damm , Arnd Bergmann MIME-Version: 1.0 Content-Type: Text/Plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <201207031227.45383.rjw@sisk.pl> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, This is a follow-up of the discussion I had with Arnd and Magnus during the LCJ last month. Namely, one of the limitations of the current generic PM domains code is that pm_genpd_add_callbacks() has to be executed after the device in question has been added to a PM domain. This means that, if a driver wants to run this routine from its .probe() callback, it cannot be registered before adding the device to the PM domain, which potentially may be a problem when device trees get involved into the system initialization. For this reason, it is desirable to allow pm_genpd_add_callbacks() to be called for devices that haven't been added to any generic PM domains yet and the following patches attempt to make that happen. [1/2] Add reference counter for objects used to store PM domains data related to devices. [2/2] Make it possible to call pm_genpd_add_callbacks() before the device is added to a PM domain. Thanks, Rafael