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