From 72d34c07e8908dc49220d58690c3162378cb5e4d Mon Sep 17 00:00:00 2001 From: Eduardo Valentin Date: Thu, 13 Feb 2014 16:18:25 -0800 Subject: cpufreq: cpufreq-cpu0: add dt node parsing for cooling device properties This patch changes the cpufreq-cpu0 driver to consider if a cpu needs cooling (with cpufreq). In case the cooling is needed, the cpu0 device tree node needs to be properly configured with cooling device properties. In case these properties are 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. Change-Id: Ie5f85e314cb45f977d9484220e4778cccaad8b4c Cc: "Rafael J. Wysocki" 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 Acked-by: Viresh Kumar Signed-off-by: Eduardo Valentin Signed-off-by: Paul Walmsley # for the NVIDIA downstream kernel Signed-off-by: Christina Guertin Reviewed-on: http://git-master/r/356897 Reviewed-by: Diwakar Tundlam --- Documentation/devicetree/bindings/cpufreq/cpufreq-cpu0.txt | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'Documentation') diff --git a/Documentation/devicetree/bindings/cpufreq/cpufreq-cpu0.txt b/Documentation/devicetree/bindings/cpufreq/cpufreq-cpu0.txt index 051f764bedb8..f055515d2b62 100644 --- a/Documentation/devicetree/bindings/cpufreq/cpufreq-cpu0.txt +++ b/Documentation/devicetree/bindings/cpufreq/cpufreq-cpu0.txt @@ -15,6 +15,10 @@ 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-cells: +- cooling-min-level: +- cooling-max-level: + Please refer to Documentation/devicetree/bindings/thermal/thermal.txt. Examples: @@ -33,6 +37,9 @@ cpus { 198000 850000 >; clock-latency = <61036>; /* two CLK32 periods */ + #cooling-cells = <2>; + cooling-min-level = <0>; + cooling-max-level = <2>; }; cpu@1 { -- cgit v1.2.3