On Qualcomm Technologies, Inc. platforms, an OPP node needs to describe an additional level/corner value that is then communicated to a remote microprocessor by the CPU, which then takes some actions (like adjusting voltage values across various rails) based on the value passed. Describe these bindings in the qcom-opp bindings document. Signed-off-by: Rajendra Nayak <rnayak@xxxxxxxxxxxxxx> Acked-by: Viresh Kumar <viresh.kumar@xxxxxxxxxx> Reviewed-by: Stephen Boyd <swboyd@xxxxxxxxxxxx> Reviewed-by: Rob Herring <robh@xxxxxxxxxx> --- .../devicetree/bindings/opp/qcom-opp.txt | 28 +++++++++++++++++++ 1 file changed, 28 insertions(+) create mode 100644 Documentation/devicetree/bindings/opp/qcom-opp.txt diff --git a/Documentation/devicetree/bindings/opp/qcom-opp.txt b/Documentation/devicetree/bindings/opp/qcom-opp.txt new file mode 100644 index 000000000000..b3850a5ed59a --- /dev/null +++ b/Documentation/devicetree/bindings/opp/qcom-opp.txt @@ -0,0 +1,28 @@ +Qualcomm OPP bindings to descibe OPP nodes with corner/level values + +OPP tables for devices on Qualcomm platforms require an additional +platform specific corner/level value to be specified. +This value is passed on to the RPM (Resource Power Manager) by +the CPU, which then takes the necessary actions to set a voltage +rail to an appropriate voltage based on the value passed. + +The bindings are based on top of the operating-points-v2 bindings +described in Documentation/devicetree/bindings/opp/opp.txt, +with the exception that all of the properties are now optional, +including the opp-hz property. + +Additional properties are described below. + +* OPP Table Node + +Required properties: +- compatible: Allow OPPs to express their compatibility. It should be: + "operating-points-v2-qcom-level" + +* OPP Node + +Required properties: +- qcom,level: On Qualcomm platforms an OPP node can describe a positive value +representing a corner/level that's communicated with a remote microprocessor +(usually called the RPM) which then translates it into a certain voltage on +a voltage rail. -- QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation
