97 lines
3.3 KiB
Plaintext
97 lines
3.3 KiB
Plaintext
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Qualcomm Technologies, Inc. SDE RSC
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Snapdragon Display Engine implements display rsc to driver
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display core to different modes for power saving
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Required properties
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- compatible: Must be "qcom,sde-rsc"
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- reg: Offset and length of the register set for
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the device.
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- reg-names: Names to refer to register sets related
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to this device
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Optional properties:
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- clocks: List of phandles for clock device nodes
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needed by the device.
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- clock-names: List of clock names needed by the device.
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- vdd-supply: phandle for vdd regulator device node.
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- qcom,sde-rsc-version: U32 property represents the rsc version. It helps to
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select correct sequence for sde rsc based on version.
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- qcom,sde-dram-channels: U32 property represents the number of channels in the
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Bus memory controller.
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- qcom,sde-num-nrt-paths: U32 property represents the number of non-realtime
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paths in each Bus Scaling Usecase. This value depends on
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number of AXI ports that are dedicated to non-realtime VBIF
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for particular chipset.
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These paths must be defined after rt-paths in
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"qcom,msm-bus,vectors-KBps" vector request.
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Bus Scaling Subnodes:
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- qcom,sde-data-bus: Property to provide Bus scaling for data bus access for
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sde blocks.
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- qcom,sde-llcc-bus: Property to provide Bus scaling for data bus access for
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mnoc to llcc.
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- qcom,sde-ebi-bus: Property to provide Bus scaling for data bus access for
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llcc to ebi.
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Bus Scaling Data:
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- qcom,msm-bus,name: String property describing client name.
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- qcom,msm-bus,active-only: Boolean context flag for requests in active or
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dual (active & sleep) contex
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- qcom,msm-bus,num-cases: This is the number of Bus Scaling use cases
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defined in the vectors property.
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- qcom,msm-bus,num-paths: This represents the number of paths in each
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Bus Scaling Usecase.
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- qcom,msm-bus,vectors-KBps: * A series of 4 cell properties, with a format
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of (src, dst, ab, ib) which is defined at
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Documentation/devicetree/bindings/arm/msm/msm_bus.txt
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* Current values of src & dst are defined at
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include/linux/msm-bus-board.h
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Example:
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sde_rscc {
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cell-index = <0>;
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compatible = "qcom,sde-rsc";
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reg = <0xaf20000 0x1c44>,
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<0xaf30000 0x3fd4>;
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reg-names = "drv", "wrapper";
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clocks = <&clock_mmss clk_mdss_ahb_clk>,
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<&clock_mmss clk_mdss_axi_clk>;
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clock-names = "iface_clk", "bus_clk";
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vdd-supply = <&gdsc_mdss>;
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qcom,sde-rsc-version = <1>;
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qcom,sde-dram-channels = <2>;
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qcom,sde-num-nrt-paths = <1>;
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qcom,sde-data-bus {
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qcom,msm-bus,name = "sde_rsc";
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qcom,msm-bus,active-only;
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qcom,msm-bus,num-cases = <3>;
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qcom,msm-bus,num-paths = <2>;
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qcom,msm-bus,vectors-KBps =
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<22 512 0 0>, <23 512 0 0>,
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<22 512 0 6400000>, <23 512 0 6400000>,
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<22 512 0 6400000>, <23 512 0 6400000>;
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};
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qcom,sde-llcc-bus {
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qcom,msm-bus,name = "sde_rsc_llcc";
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qcom,msm-bus,active-only;
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qcom,msm-bus,num-cases = <3>;
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qcom,msm-bus,num-paths = <1>;
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qcom,msm-bus,vectors-KBps =
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<20001 20513 0 0>,
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<20001 20513 0 6400000>,
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<20001 20513 0 6400000>;
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};
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qcom,sde-ebi-bus {
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qcom,msm-bus,name = "sde_rsc_ebi";
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qcom,msm-bus,active-only;
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qcom,msm-bus,num-cases = <3>;
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qcom,msm-bus,num-paths = <1>;
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qcom,msm-bus,vectors-KBps =
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<20000 20512 0 0>,
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<20000 20512 0 6400000>,
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<20000 20512 0 6400000>;
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};
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};
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