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* 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,rk3288-power-controller" - for RK3288 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/rk3288-power.h" - for RK3288 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/rk3288-power.h" - for rk3288 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>;
/* ... */
};
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