1* Rockchip Power Domains 2 3Rockchip processors include support for multiple power domains which can be 4powered up/down by software based on different application scenes to save power. 5 6Required properties for power domain controller: 7- compatible: Should be one of the following. 8 "rockchip,rk3288-power-controller" - for RK3288 SoCs. 9- #power-domain-cells: Number of cells in a power-domain specifier. 10 Should be 1 for multiple PM domains. 11- #address-cells: Should be 1. 12- #size-cells: Should be 0. 13 14Required properties for power domain sub nodes: 15- reg: index of the power domain, should use macros in: 16 "include/dt-bindings/power/rk3288-power.h" - for RK3288 type power domain. 17- clocks (optional): phandles to clocks which need to be enabled while power domain 18 switches state. 19 20Example: 21 22 power: power-controller { 23 compatible = "rockchip,rk3288-power-controller"; 24 #power-domain-cells = <1>; 25 #address-cells = <1>; 26 #size-cells = <0>; 27 28 pd_gpu { 29 reg = <RK3288_PD_GPU>; 30 clocks = <&cru ACLK_GPU>; 31 }; 32 }; 33 34Node of a device using power domains must have a power-domains property, 35containing a phandle to the power device node and an index specifying which 36power domain to use. 37The index should use macros in: 38 "include/dt-bindings/power/rk3288-power.h" - for rk3288 type power domain. 39 40Example of the node using power domain: 41 42 node { 43 /* ... */ 44 power-domains = <&power RK3288_PD_GPU>; 45 /* ... */ 46 }; 47