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[v7,01/10] dt-bindings: opp: Introduce qcom-opp bindings

Message ID 20181212092131.13046-2-rnayak@codeaurora.org (mailing list archive)
State Superseded, archived
Headers show
Series Add power domain driver for corners on msm8996/sdm845 | expand

Commit Message

Rajendra Nayak Dec. 12, 2018, 9:21 a.m. UTC 
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@codeaurora.org>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Reviewed-by: Rob Herring <robh@kernel.org>
---
 .../devicetree/bindings/opp/qcom-opp.txt      | 25 +++++++++++++++++++
 1 file changed, 25 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/opp/qcom-opp.txt
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Patch

diff --git a/Documentation/devicetree/bindings/opp/qcom-opp.txt b/Documentation/devicetree/bindings/opp/qcom-opp.txt
new file mode 100644
index 000000000000..db4d970c7ec7
--- /dev/null
+++ b/Documentation/devicetree/bindings/opp/qcom-opp.txt
@@ -0,0 +1,25 @@ 
+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
+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.