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-rw-r--r-- | Documentation/devicetree/bindings/clock/qcom,rpmcc.txt | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/clock/qcom,rpmcc.txt b/Documentation/devicetree/bindings/clock/qcom,rpmcc.txt new file mode 100644 index 000000000..4491d1c10 --- /dev/null +++ b/Documentation/devicetree/bindings/clock/qcom,rpmcc.txt @@ -0,0 +1,49 @@ +Qualcomm RPM Clock Controller Binding +------------------------------------------------ +The RPM is a dedicated hardware engine for managing the shared +SoC resources in order to keep the lowest power profile. It +communicates with other hardware subsystems via shared memory +and accepts clock requests, aggregates the requests and turns +the clocks on/off or scales them on demand. + +Required properties : +- compatible : shall contain only one of the following. The generic + compatible "qcom,rpmcc" should be also included. + + "qcom,rpmcc-msm8660", "qcom,rpmcc" + "qcom,rpmcc-apq8060", "qcom,rpmcc" + "qcom,rpmcc-msm8916", "qcom,rpmcc" + "qcom,rpmcc-msm8974", "qcom,rpmcc" + "qcom,rpmcc-apq8064", "qcom,rpmcc" + "qcom,rpmcc-msm8996", "qcom,rpmcc" + +- #clock-cells : shall contain 1 + +The clock enumerators are defined in <dt-bindings/clock/qcom,rpmcc.h> +and come in pairs: FOO_CLK followed by FOO_A_CLK. The latter clock +is an "active" clock, which means that the consumer only care that the +clock is available when the apps CPU subsystem is active, i.e. not +suspended or in deep idle. If it is important that the clock keeps running +during system suspend, you need to specify the non-active clock, the one +not containing *_A_* in the enumerator name. + +Example: + smd { + compatible = "qcom,smd"; + + rpm { + interrupts = <0 168 1>; + qcom,ipc = <&apcs 8 0>; + qcom,smd-edge = <15>; + + rpm_requests { + compatible = "qcom,rpm-msm8916"; + qcom,smd-channels = "rpm_requests"; + + rpmcc: clock-controller { + compatible = "qcom,rpmcc-msm8916", "qcom,rpmcc"; + #clock-cells = <1>; + }; + }; + }; + }; |