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[95.251.1.48]) by smtp.googlemail.com with ESMTPSA id j11sm2669756wrq.69.2020.08.05.06.12.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 05 Aug 2020 06:12:16 -0700 (PDT) From: Ansuel Smith To: Viresh Kumar Cc: Ansuel Smith , "Rafael J. Wysocki" , Rob Herring , linux-pm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [RFC PATCH 2/2] dt-bindings: cpufreq: Document Krait CPU Cache scaling Date: Wed, 5 Aug 2020 15:11:59 +0200 Message-Id: <20200805131200.3234-3-ansuelsmth@gmail.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20200805131200.3234-1-ansuelsmth@gmail.com> References: <20200805131200.3234-1-ansuelsmth@gmail.com> MIME-Version: 1.0 Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org Document dedicated Krait CPU Cache Scaling driver. Signed-off-by: Ansuel Smith --- .../bindings/cpufreq/krait-cache-scale.yaml | 89 +++++++++++++++++++ 1 file changed, 89 insertions(+) create mode 100644 Documentation/devicetree/bindings/cpufreq/krait-cache-scale.yaml diff --git a/Documentation/devicetree/bindings/cpufreq/krait-cache-scale.yaml b/Documentation/devicetree/bindings/cpufreq/krait-cache-scale.yaml new file mode 100644 index 000000000000..190276ba035a --- /dev/null +++ b/Documentation/devicetree/bindings/cpufreq/krait-cache-scale.yaml @@ -0,0 +1,89 @@ +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/cpufreq/krait-cache-scale.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Krait Cpu Cache Frequency Scaling dedicated driver + +maintainers: + - Ansuel Smith + +description: | + This Scale the Krait CPU Cache Frequency and optionally voltage + when the Cpu Frequency is changed (using the cpufreq notifier). + + Cache is scaled with the max frequency across all core and the cache + frequency will scale based on the configured threshold in the dts. + + The cache is hardcoded to 3 frequency bin, idle, nominal and high. + +properties: + compatible: + const: qcom,krait-cache + + clocks: + description: Phandle to the L2 CPU clock + + clock-names: + const: "l2" + + voltage-tolerance: + description: Same voltage tollerance of the Krait CPU + + l2-rates: + description: | + Frequency the L2 cache will be scaled at. + Value is in Hz. + items: + - description: idle + - description: nominal + - description: high + + l2-cpufreq: + description: | + Threshold used by the driver to scale the L2 cache. + If the max CPU Frequency is more than the set frequency, + the driver will transition to the next frequency bin. + Value is in kHz + items: + - description: idle + - description: nominal + - description: high + + l2-volt: + description: | + Threshold used by the driver to scale the L2 cache. + If the max CPU Frequency is more than the set frequency, + the driver will transition to the next frequency bin. + Value is in microvolt. + items: + - description: idle + - description: nominal + - description: high + + l2-supply: + description: Phandle to the L2 regulator supply. + +required: + - compatible + - clocks + - clock-names + - voltage-tolerance + - l2-rates + - l2-cpufreq + - l2-supply + - l2-volt + +examples: + - | + qcom-krait-cache { + compatible = "qcom,krait-cache"; + clocks = <&kraitcc 4>; + clock-names = "l2"; + voltage-tolerance = <5>; + l2-rates = <384000000 1000000000 1200000000>; + l2-cpufreq = <384000 600000 1200000>; + l2-volt = <1100000 1100000 1150000>; + l2-supply = <&smb208_s1a>; + };