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Subject[PATCH v4 1/3] dt-bindings: opp: Introduce opp-peak-KBps and opp-avg-KBps bindings
From
Interconnects often quantify their performance points in terms of
bandwidth. So, add opp-peak-KBps (required) and opp-avg-KBps (optional) to
allow specifying Bandwidth OPP tables in DT.

opp-peak-KBps is a required property that replace opp-hz for Bandwidth OPP
tables.

opp-avg-KBps is an optional property that can be used in Bandwidth OPP
tables.

Signed-off-by: Saravana Kannan <saravanak@google.com>
---
Documentation/devicetree/bindings/opp/opp.txt | 15 ++++++++++++---
.../devicetree/bindings/property-units.txt | 4 ++++
2 files changed, 16 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/opp/opp.txt b/Documentation/devicetree/bindings/opp/opp.txt
index 76b6c79604a5..b1eb49d6eab0 100644
--- a/Documentation/devicetree/bindings/opp/opp.txt
+++ b/Documentation/devicetree/bindings/opp/opp.txt
@@ -83,9 +83,14 @@ properties.

Required properties:
- opp-hz: Frequency in Hz, expressed as a 64-bit big-endian integer. This is a
- required property for all device nodes but devices like power domains. The
- power domain nodes must have another (implementation dependent) property which
- uniquely identifies the OPP nodes.
+ required property for all device nodes but for devices like power domains or
+ bandwidth opp tables. The power domain nodes must have another (implementation
+ dependent) property which uniquely identifies the OPP nodes. The interconnect
+ opps are required to have the opp-peak-KBps property.
+
+- opp-peak-KBps: Peak bandwidth in kilobytes per second, expressed as a 32-bit
+ big-endian integer. This is a required property for all devices that don't
+ have opp-hz. For example, bandwidth OPP tables for interconnect paths.

Optional properties:
- opp-microvolt: voltage in micro Volts.
@@ -132,6 +137,10 @@ Optional properties:
- opp-level: A value representing the performance level of the device,
expressed as a 32-bit integer.

+- opp-avg-KBps: Average bandwidth in kilobytes per second, expressed as a
+ 32-bit big-endian integer. This property is only meaningful in OPP tables
+ where opp-peak-KBps is present.
+
- clock-latency-ns: Specifies the maximum possible transition latency (in
nanoseconds) for switching to this OPP from any other OPP.

diff --git a/Documentation/devicetree/bindings/property-units.txt b/Documentation/devicetree/bindings/property-units.txt
index e9b8360b3288..ef4c4a199efa 100644
--- a/Documentation/devicetree/bindings/property-units.txt
+++ b/Documentation/devicetree/bindings/property-units.txt
@@ -41,3 +41,7 @@ Temperature
Pressure
----------------------------------------
-kpascal : kilopascal
+
+Throughput
+----------------------------------------
+-KBps : kilobytes per second
--
2.22.0.709.g102302147b-goog
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