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authorEduardo Valentin <eduardo.valentin@ti.com>2013-07-15 17:09:14 +0400
committerEduardo Valentin <eduardo.valentin@ti.com>2013-12-04 17:34:24 +0400
commit77cff5926a14e80d4545be5841d5938b87b654a4 (patch)
treece23d4d9d89e99b6a6d3b69e101f062d70d6a22f /Documentation/devicetree/bindings/cpufreq
parent39d99cff76bf2992fd6dd4b1fc62da139e62e90c (diff)
downloadlinux-77cff5926a14e80d4545be5841d5938b87b654a4.tar.xz
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. Cc: "Rafael J. Wysocki" <rjw@sisk.pl> Cc: Grant Likely <grant.likely@linaro.org> Cc: Rob Herring <rob.herring@calxeda.com> 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 <viresh.kumar@linaro.org> Signed-off-by: Eduardo Valentin <eduardo.valentin@ti.com>
Diffstat (limited to 'Documentation/devicetree/bindings/cpufreq')
-rw-r--r--Documentation/devicetree/bindings/cpufreq/cpufreq-cpu0.txt7
1 files changed, 7 insertions, 0 deletions
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 {