From patchwork Fri Aug 23 23:15:42 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eduardo Valentin X-Patchwork-Id: 2849130 X-Patchwork-Delegate: rui.zhang@intel.com Return-Path: X-Original-To: patchwork-linux-pm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 879B99F9EC for ; Fri, 23 Aug 2013 23:18:51 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id A40492037B for ; Fri, 23 Aug 2013 23:18:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B432E2037F for ; Fri, 23 Aug 2013 23:18:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755188Ab3HWXRd (ORCPT ); Fri, 23 Aug 2013 19:17:33 -0400 Received: from devils.ext.ti.com ([198.47.26.153]:35437 "EHLO devils.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755114Ab3HWXRa (ORCPT ); Fri, 23 Aug 2013 19:17:30 -0400 Received: from dlelxv90.itg.ti.com ([172.17.2.17]) by devils.ext.ti.com (8.13.7/8.13.7) with ESMTP id r7NNGSQB005831; Fri, 23 Aug 2013 18:16:28 -0500 Received: from DFLE73.ent.ti.com (dfle73.ent.ti.com [128.247.5.110]) by dlelxv90.itg.ti.com (8.14.3/8.13.8) with ESMTP id r7NNGSf4006631; Fri, 23 Aug 2013 18:16:28 -0500 Received: from dflp32.itg.ti.com (10.64.6.15) by DFLE73.ent.ti.com (128.247.5.110) with Microsoft SMTP Server id 14.2.342.3; Fri, 23 Aug 2013 18:16:28 -0500 Received: from legion.dal.design.ti.com (legion.dal.design.ti.com [128.247.22.53]) by dflp32.itg.ti.com (8.14.3/8.13.8) with ESMTP id r7NNGSt3000868; Fri, 23 Aug 2013 18:16:28 -0500 Received: from localhost (h68-1.vpn.ti.com [172.24.68.1]) by legion.dal.design.ti.com (8.11.7p1+Sun/8.11.7) with ESMTP id r7NNGJt22663; Fri, 23 Aug 2013 18:16:20 -0500 (CDT) From: Eduardo Valentin To: , , , , , , , , CC: , , , , , Eduardo Valentin , "Rafael J. Wysocki" , Viresh Kumar , , Subject: [RFC PATCH 01/14] cpufreq: cpufreq-cpu0: add dt node parsing for 'cooling-zones' Date: Fri, 23 Aug 2013 19:15:42 -0400 Message-ID: <1377299755-5134-2-git-send-email-eduardo.valentin@ti.com> X-Mailer: git-send-email 1.8.2.1.342.gfa7285d In-Reply-To: <1377299755-5134-1-git-send-email-eduardo.valentin@ti.com> References: <1377299755-5134-1-git-send-email-eduardo.valentin@ti.com> MIME-Version: 1.0 Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org X-Spam-Status: No, score=-9.7 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This patch changes the cpufreq-cpu0 driver to consider if a cpu needs cooling (with cpufreq). In case the cooling is needed, it can be flagged at the cpu0 device tree node, with the list of zones property 'cooling-zones'. In case this list of zones is present, the driver will load a cpufreq cooling device in the system. The cpufreq-cpu0 driver is not interested in determining how the system should be using the cooling device. The driver is responsible only of loading the cooling device. Describing how the cooling device will be used can be accomplished by setting up a thermal zone that references and is composed by the cpufreq cooling device. Cc: "Rafael J. Wysocki" Cc: Viresh Kumar Cc: Grant Likely Cc: Rob Herring Cc: cpufreq@vger.kernel.org Cc: linux-pm@vger.kernel.org Cc: linux-kernel@vger.kernel.org Cc: devicetree-discuss@lists.ozlabs.org Signed-off-by: Eduardo Valentin --- Documentation/devicetree/bindings/cpufreq/cpufreq-cpu0.txt | 4 ++++ drivers/cpufreq/cpufreq-cpu0.c | 12 ++++++++++++ 2 files changed, 16 insertions(+) diff --git a/Documentation/devicetree/bindings/cpufreq/cpufreq-cpu0.txt b/Documentation/devicetree/bindings/cpufreq/cpufreq-cpu0.txt index 051f764..add50f7 100644 --- a/Documentation/devicetree/bindings/cpufreq/cpufreq-cpu0.txt +++ b/Documentation/devicetree/bindings/cpufreq/cpufreq-cpu0.txt @@ -15,6 +15,9 @@ Optional properties: - clock-latency: Specify the possible maximum transition latency for clock, in unit of nanoseconds. - voltage-tolerance: Specify the CPU voltage tolerance in percentage. +- cooling-zones: A list of thermal zones phandles. The generic cpu + cooling (freq clipping) is loaded by the generic cpufreq-cpu0 driver + in case the device tree node has this list. Examples: @@ -33,6 +36,7 @@ cpus { 198000 850000 >; clock-latency = <61036>; /* two CLK32 periods */ + cooling-zones = <&cpu_thermal>; }; cpu@1 { diff --git a/drivers/cpufreq/cpufreq-cpu0.c b/drivers/cpufreq/cpufreq-cpu0.c index ad1fde2..ede6487 100644 --- a/drivers/cpufreq/cpufreq-cpu0.c +++ b/drivers/cpufreq/cpufreq-cpu0.c @@ -20,6 +20,9 @@ #include #include #include +#include +#include +#include static unsigned int transition_latency; static unsigned int voltage_tolerance; /* in percentage */ @@ -28,6 +31,7 @@ static struct device *cpu_dev; static struct clk *cpu_clk; static struct regulator *cpu_reg; static struct cpufreq_frequency_table *freq_table; +static struct thermal_cooling_device *cdev; static int cpu0_verify_speed(struct cpufreq_policy *policy) { @@ -268,6 +272,13 @@ static int cpu0_cpufreq_probe(struct platform_device *pdev) goto out_free_table; } + /* + * For now, just loading the cooling device; + * thermal DT code takes care of matching them. + */ + if (of_find_property(np, "cooling-zones", NULL)) + cdev = cpufreq_cooling_register(cpu_present_mask); + of_node_put(np); of_node_put(parent); return 0; @@ -283,6 +294,7 @@ out_put_parent: static int cpu0_cpufreq_remove(struct platform_device *pdev) { + cpufreq_cooling_unregister(cdev); cpufreq_unregister_driver(&cpu0_cpufreq_driver); opp_free_cpufreq_table(cpu_dev, &freq_table);