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authorShawn Guo <shawn.guo@linaro.org>2012-09-05 01:09:12 +0200
committerRafael J. Wysocki <rjw@sisk.pl>2012-09-09 22:06:33 +0200
commitb496dfbc94ab86f970ef0167eaabe51f930aa5fb (patch)
tree3ce7bdb6847fbcff3f46935ebc5b5c17da23d31d /Documentation/devicetree/bindings/power
parentec971ea5f2426a0bf9d5cca9a103743918c12978 (diff)
PM / OPP: Initialize OPP table from device tree
With a lot of devices booting from device tree nowadays, it requires that OPP table can be initialized from device tree. The patch adds a helper function of_init_opp_table together with a binding doc for that purpose. Signed-off-by: Shawn Guo <shawn.guo@linaro.org> Acked-by: Rob Herring <rob.herring@calxeda.com> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Diffstat (limited to 'Documentation/devicetree/bindings/power')
-rw-r--r--Documentation/devicetree/bindings/power/opp.txt25
1 files changed, 25 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/power/opp.txt b/Documentation/devicetree/bindings/power/opp.txt
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+++ b/Documentation/devicetree/bindings/power/opp.txt
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+* Generic OPP Interface
+
+SoCs have a standard set of tuples consisting of frequency and
+voltage pairs that the device will support per voltage domain. These
+are called Operating Performance Points or OPPs.
+
+Properties:
+- operating-points: An array of 2-tuples items, and each item consists
+ of frequency and voltage like <freq-kHz vol-uV>.
+ freq: clock frequency in kHz
+ vol: voltage in microvolt
+
+Examples:
+
+cpu@0 {
+ compatible = "arm,cortex-a9";
+ reg = <0>;
+ next-level-cache = <&L2>;
+ operating-points = <
+ /* kHz uV */
+ 792000 1100000
+ 396000 950000
+ 198000 850000
+ >;
+};

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