linux-kernel - [PATCH 3/7] dt-bindings: opp: Introduce qcom-opp bindings

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Date:   Fri, 16 Mar 2018 09:38:20 +0530
From:   Rajendra Nayak <rnayak@...eaurora.org>
To:     viresh.kumar@...aro.org, sboyd@...nel.org, andy.gross@...aro.org,
        ulf.hansson@...aro.org
Cc:     devicetree@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Rajendra Nayak <rnayak@...eaurora.org>
Subject: [PATCH 3/7] dt-bindings: opp: Introduce qcom-opp bindings

On Qualcomm 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@...eaurora.org>
---
 Documentation/devicetree/bindings/opp/qcom-opp.txt | 25 ++++++++++++++++++++++
 1 file changed, 25 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..56fe87751881
--- /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 a 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"
+
+* OPP Node
+
+Required properties:
+- qcom,level: On Qualcomm platforms an OPP node can describe a positive value
+representing a corner/level thats comminicated 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