Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755266Ab3HWXRe (ORCPT ); Fri, 23 Aug 2013 19:17:34 -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 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 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3716 Lines: 103 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); -- 1.8.2.1.342.gfa7285d -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/