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dt-bindings: opp: Introduce opp-peak-kBps and opp-avg-kBps bindings

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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 replaces 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>
Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
Reviewed-by: Sibi Sankar <sibis@codeaurora.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
This commit is contained in:
Saravana Kannan 2020-05-12 15:53:18 +03:00 committed by Viresh Kumar
parent ae83d0b416
commit 45a41875fa
2 changed files with 18 additions and 3 deletions
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17
Documentation/devicetree/bindings/opp/opp.txt
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@ -83,9 +83,14 @@ properties.
Required properties: Required properties:
- opp-hz: Frequency in Hz, expressed as a 64-bit big-endian integer. This is a - 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 required property for all device nodes, unless another "required" property to
power domain nodes must have another (implementation dependent) property which uniquely identify the OPP nodes exists. Devices like power domains must have
uniquely identifies the OPP nodes. another (implementation dependent) property.
- opp-peak-kBps: Peak bandwidth in kilobytes per second, expressed as an array
of 32-bit big-endian integers. Each element of the array represents the
peak bandwidth value of each interconnect path. The number of elements should
match the number of interconnect paths.
Optional properties: Optional properties:
- opp-microvolt: voltage in micro Volts. - opp-microvolt: voltage in micro Volts.
@ -132,6 +137,12 @@ Optional properties:
- opp-level: A value representing the performance level of the device, - opp-level: A value representing the performance level of the device,
expressed as a 32-bit integer. expressed as a 32-bit integer.
- opp-avg-kBps: Average bandwidth in kilobytes per second, expressed as an array
of 32-bit big-endian integers. Each element of the array represents the
average bandwidth value of each interconnect path. The number of elements
should match the number of interconnect paths. This property is only
meaningful in OPP tables where opp-peak-kBps is present.
- clock-latency-ns: Specifies the maximum possible transition latency (in - clock-latency-ns: Specifies the maximum possible transition latency (in
nanoseconds) for switching to this OPP from any other OPP. nanoseconds) for switching to this OPP from any other OPP.

4
Documentation/devicetree/bindings/property-units.txt
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@ -41,3 +41,7 @@ Temperature
Pressure Pressure
---------------------------------------- ----------------------------------------
-kpascal : kilopascal -kpascal : kilopascal
Throughput
----------------------------------------
-kBps : kilobytes per second