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@xxxxxxxxxx> Reviewed-by: Rob Herring <robh@xxxxxxxxxx> --- 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 68592271461f..dbad8eb6c746 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 except 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..c80a110c1e26 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 -- 2.24.0.393.g34dc348eaf-goog
