Kernel-4.18.0-80.el8_power_domain

• Rockchip Power Domains

Rockchip processors include support for multiple power domains which can be
powered up/down by software based on different application scenes to save power.

Required properties for power domain controller:

• compatible: Should be one of the following.
  “rockchip,px30-power-controller” - for PX30 SoCs.
  “rockchip,rk3036-power-controller” - for RK3036 SoCs.
  “rockchip,rk3128-power-controller” - for RK3128 SoCs.
  “rockchip,rk3228-power-controller” - for RK3228 SoCs.
  “rockchip,rk3288-power-controller” - for RK3288 SoCs.
  “rockchip,rk3328-power-controller” - for RK3328 SoCs.
  “rockchip,rk3366-power-controller” - for RK3366 SoCs.
  “rockchip,rk3368-power-controller” - for RK3368 SoCs.
  “rockchip,rk3399-power-controller” - for RK3399 SoCs.
• #power-domain-cells: Number of cells in a power-domain specifier.
  Should be 1 for multiple PM domains.
• #address-cells: Should be 1.
• #size-cells: Should be 0.

Required properties for power domain sub nodes:

• reg: index of the power domain, should use macros in:
  “include/dt-bindings/power/px30-power.h” - for PX30 type power domain.
  “include/dt-bindings/power/rk3036-power.h” - for RK3036 type power domain.
  “include/dt-bindings/power/rk3128-power.h” - for RK3128 type power domain.
  “include/dt-bindings/power/rk3228-power.h” - for RK3228 type power domain.
  “include/dt-bindings/power/rk3288-power.h” - for RK3288 type power domain.
  “include/dt-bindings/power/rk3328-power.h” - for RK3328 type power domain.
  “include/dt-bindings/power/rk3366-power.h” - for RK3366 type power domain.
  “include/dt-bindings/power/rk3368-power.h” - for RK3368 type power domain.
  “include/dt-bindings/power/rk3399-power.h” - for RK3399 type power domain.
• clocks (optional): phandles to clocks which need to be enabled while power domain
  switches state.
• pm_qos (optional): phandles to qos blocks which need to be saved and restored
  while power domain switches state.

Qos Example:

qos_gpu: qos_gpu@ffaf0000 {
    compatible ="syscon";
    reg = <0x0 0xffaf0000 0x0 0x20>;
};

Example:

power: power-controller {
    compatible = "rockchip,rk3288-power-controller";
    #power-domain-cells = <1>;
    #address-cells = <1>;
    #size-cells = <0>;

    pd_gpu {
        reg = <RK3288_PD_GPU>;
        clocks = <&cru ACLK_GPU>;
        pm_qos = <&qos_gpu>;
    };
};

 power: power-controller {
            compatible = "rockchip,rk3368-power-controller";
            #power-domain-cells = <1>;
            #address-cells = <1>;
            #size-cells = <0>;

            pd_gpu_1 {
                    reg = <RK3368_PD_GPU_1>;
                    clocks = <&cru ACLK_GPU_CFG>;
            };
    };

Example 2:
power: power-controller {
compatible = “rockchip,rk3399-power-controller”;
#power-domain-cells = <1>;
#address-cells = <1>;
#size-cells = <0>;

        pd_vio {
            #address-cells = <1>;
            #size-cells = <0>;
            reg = <RK3399_PD_VIO>;

            pd_vo {
                #address-cells = <1>;
                #size-cells = <0>;
                reg = <RK3399_PD_VO>;

                pd_vopb {
                    reg = <RK3399_PD_VOPB>;
                };

                pd_vopl {
                    reg = <RK3399_PD_VOPL>;
                };
            };
        };
    };

Node of a device using power domains must have a power-domains property,
containing a phandle to the power device node and an index specifying which
power domain to use.
The index should use macros in:
“include/dt-bindings/power/px30-power.h” - for px30 type power domain.
“include/dt-bindings/power/rk3036-power.h” - for rk3036 type power domain.
“include/dt-bindings/power/rk3128-power.h” - for rk3128 type power domain.
“include/dt-bindings/power/rk3128-power.h” - for rk3228 type power domain.
“include/dt-bindings/power/rk3288-power.h” - for rk3288 type power domain.
“include/dt-bindings/power/rk3328-power.h” - for rk3328 type power domain.
“include/dt-bindings/power/rk3366-power.h” - for rk3366 type power domain.
“include/dt-bindings/power/rk3368-power.h” - for rk3368 type power domain.
“include/dt-bindings/power/rk3399-power.h” - for rk3399 type power domain.

Example of the node using power domain:

node {
    /* ... */
    power-domains = <&power RK3288_PD_GPU>;
    /* ... */
};

node {
            /* ... */
            power-domains = <&power RK3368_PD_GPU_1>;
            /* ... */
    };

node {
    /* ... */
    power-domains = <&power RK3399_PD_VOPB>;
    /* ... */
};