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| author | Saravana Kannan <saravanak@google.com> | 2020-05-12 14:53:18 +0200 |
|---|---|---|
| committer | Viresh Kumar <viresh.kumar@linaro.org> | 2020-05-13 08:16:11 +0200 |
| commit | 45a41875fa20836f2839d4dda1f37d119a275542 (patch) | |
| tree | fb3fa6eb6346f7da3b67e5393cd87bb557008121 /Documentation | |
| parent | Linux 5.7-rc2 (diff) | |
| download | linux-45a41875fa20836f2839d4dda1f37d119a275542.tar.xz linux-45a41875fa20836f2839d4dda1f37d119a275542.zip | |
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: 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>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/devicetree/bindings/opp/opp.txt | 17 | ||||
| -rw-r--r-- | Documentation/devicetree/bindings/property-units.txt | 4 |
2 files changed, 18 insertions, 3 deletions
diff --git a/Documentation/devicetree/bindings/opp/opp.txt b/Documentation/devicetree/bindings/opp/opp.txt index 68592271461f..9d16d417e9be 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, 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. 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 |