Commit 45a41875 authored by Saravana Kannan's avatar Saravana Kannan Committed by Viresh Kumar
Browse files

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



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: default avatarSaravana Kannan <saravanak@google.com>
Signed-off-by: default avatarGeorgi Djakov <georgi.djakov@linaro.org>
Reviewed-by: default avatarSibi Sankar <sibis@codeaurora.org>
Reviewed-by: default avatarRob Herring <robh@kernel.org>
Signed-off-by: default avatarViresh Kumar <viresh.kumar@linaro.org>
parent ae83d0b4

Documentation/devicetree/bindings/opp/opp.txt

+14 −3
Original line number Diff line number Diff line
@@ -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, unless another "required" property to

  uniquely identify the OPP nodes exists. Devices like power domains must have

  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:

- opp-microvolt: voltage in micro Volts.
@@ -132,6 +137,12 @@ 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 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

  nanoseconds) for switching to this OPP from any other OPP.

Documentation/devicetree/bindings/property-units.txt

+4 −0
Original line number Diff line number Diff line
@@ -41,3 +41,7 @@ Temperature 
Pressure

----------------------------------------

-kpascal	: kilopascal



Throughput

----------------------------------------

-kBps		: kilobytes per second