On some SoCs (especially from Qualcomm and MediaTek) 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 opp-level bindings document. Signed-off-by: Rajendra Nayak <rnayak@xxxxxxxxxxxxxx> --- .../devicetree/bindings/opp/opp-level.txt | 29 +++++++++++++++++++ 1 file changed, 29 insertions(+) create mode 100644 Documentation/devicetree/bindings/opp/opp-level.txt diff --git a/Documentation/devicetree/bindings/opp/opp-level.txt b/Documentation/devicetree/bindings/opp/opp-level.txt new file mode 100644 index 000000000000..f9134ed08164 --- /dev/null +++ b/Documentation/devicetree/bindings/opp/opp-level.txt @@ -0,0 +1,29 @@ +OPP level bindings to descibe OPP nodes with corner/level values + +OPP tables for devices on some SoCs, especially from Qualcomm and +MediaTek require an additional platform specific corner/level +value to be specified. +This value is passed on to a 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-level" + +* OPP Node + +Required properties: +- opp-level: On some SoC platforms an OPP node can describe a positive value +representing a corner/level that's communicated with a remote microprocessor +(usually called the power manager) 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
