From mboxrd@z Thu Jan 1 00:00:00 1970 From: Saravana Kannan Subject: [PATCH v5 1/3] dt-bindings: opp: Introduce opp-peak-kBps and opp-avg-kBps bindings Date: Wed, 7 Aug 2019 15:31:09 -0700 Message-ID: <20190807223111.230846-2-saravanak@google.com> References: <20190807223111.230846-1-saravanak@google.com> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Return-path: In-Reply-To: <20190807223111.230846-1-saravanak@google.com> Sender: linux-kernel-owner@vger.kernel.org To: Rob Herring , Mark Rutland , Viresh Kumar , Nishanth Menon , Stephen Boyd , "Rafael J. Wysocki" Cc: Saravana Kannan , Georgi Djakov , vincent.guittot@linaro.org, seansw@qti.qualcomm.com, daidavid1@codeaurora.org, adharmap@codeaurora.org, Rajendra Nayak , sibis@codeaurora.org, bjorn.andersson@linaro.org, evgreen@chromium.org, kernel-team@android.com, linux-pm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org List-Id: devicetree@vger.kernel.org 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 --- 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 -- 2.23.0.rc1.153.gdeed80330f-goog