linux-kernel - [PATCH v10 1/9] dt-bindings: opp: Introduce opp-level bindings

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Message-Id: <20190110035852.5666-2-rnayak@codeaurora.org>
Date:   Thu, 10 Jan 2019 09:28:44 +0530
From:   Rajendra Nayak <rnayak@...eaurora.org>
To:     andy.gross@...aro.org, robh@...nel.org, viresh.kumar@...aro.org,
        sboyd@...nel.org, ulf.hansson@...aro.org, collinsd@...eaurora.org,
        mka@...omium.org
Cc:     devicetree@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, henryc.chen@...iatek.com,
        Rajendra Nayak <rnayak@...eaurora.org>
Subject: [PATCH v10 1/9] dt-bindings: opp: Introduce opp-level bindings

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 variousi
rails) based on the value passed.

Add opp-level as an additional property in the OPP node and describe it
in the OPP bindings document.

Signed-off-by: Rajendra Nayak <rnayak@...eaurora.org>
---
 Documentation/devicetree/bindings/opp/opp.txt | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Documentation/devicetree/bindings/opp/opp.txt b/Documentation/devicetree/bindings/opp/opp.txt
index c396c4c0af92..e83fb7cbfd58 100644
--- a/Documentation/devicetree/bindings/opp/opp.txt
+++ b/Documentation/devicetree/bindings/opp/opp.txt
@@ -129,6 +129,11 @@ Optional properties:
 - opp-microamp-<name>: Named opp-microamp property. Similar to
   opp-microvolt-<name> property, but for microamp instead.
 
+- 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.
+
 - clock-latency-ns: Specifies the maximum possible transition latency (in
   nanoseconds) for switching to this OPP from any other OPP.
 
-- 
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