Documentation/devicetree/bindings/soc/rockchip/power_domain.txt

   1 * Rockchip Power Domains
   2
   3 Rockchip processors include support for multiple power domains which can be
   4 powered up/down by software based on different application scenes to save power.
   5
   6 Required properties for power domain controller:
   7 - compatible: Should be one of the following.
   8         "rockchip,rk3288-power-controller" - for RK3288 SoCs.
   9         "rockchip,rk3328-power-controller" - for RK3328 SoCs.
  10         "rockchip,rk3368-power-controller" - for RK3368 SoCs.
  11         "rockchip,rk3399-power-controller" - for RK3399 SoCs.
  12 - #power-domain-cells: Number of cells in a power-domain specifier.
  13         Should be 1 for multiple PM domains.
  14 - #address-cells: Should be 1.
  15 - #size-cells: Should be 0.
  16
  17 Required properties for power domain sub nodes:
  18 - reg: index of the power domain, should use macros in:
  19         "include/dt-bindings/power/rk3288-power.h" - for RK3288 type power domain.
  20         "include/dt-bindings/power/rk3328-power.h" - for RK3328 type power domain.
  21         "include/dt-bindings/power/rk3368-power.h" - for RK3368 type power domain.
  22         "include/dt-bindings/power/rk3399-power.h" - for RK3399 type power domain.
  23 - clocks (optional): phandles to clocks which need to be enabled while power domain
  24         switches state.
  25 - pm_qos (optional): phandles to qos blocks which need to be saved and restored
  26         while power domain switches state.
  27
  28 Qos Example:
  29
  30         qos_gpu: qos_gpu@ffaf0000 {
  31                 compatible ="syscon";
  32                 reg = <0x0 0xffaf0000 0x0 0x20>;
  33         };
  34
  35 Example:
  36
  37         power: power-controller {
  38                 compatible = "rockchip,rk3288-power-controller";
  39                 #power-domain-cells = <1>;
  40                 #address-cells = <1>;
  41                 #size-cells = <0>;
  42
  43                 pd_gpu {
  44                         reg = <RK3288_PD_GPU>;
  45                         clocks = <&cru ACLK_GPU>;
  46                         pm_qos = <&qos_gpu>;
  47                 };
  48         };
  49
  50          power: power-controller {
  51                 compatible = "rockchip,rk3368-power-controller";
  52                 #power-domain-cells = <1>;
  53                 #address-cells = <1>;
  54                 #size-cells = <0>;
  55
  56                 pd_gpu_1 {
  57                         reg = <RK3368_PD_GPU_1>;
  58                         clocks = <&cru ACLK_GPU_CFG>;
  59                 };
  60         };
  61
  62 Example 2:
  63                 power: power-controller {
  64                         compatible = "rockchip,rk3399-power-controller";
  65                         #power-domain-cells = <1>;
  66                         #address-cells = <1>;
  67                         #size-cells = <0>;
  68
  69                         pd_vio {
  70                                 #address-cells = <1>;
  71                                 #size-cells = <0>;
  72                                 reg = <RK3399_PD_VIO>;
  73
  74                                 pd_vo {
  75                                         #address-cells = <1>;
  76                                         #size-cells = <0>;
  77                                         reg = <RK3399_PD_VO>;
  78
  79                                         pd_vopb {
  80                                                 reg = <RK3399_PD_VOPB>;
  81                                         };
  82
  83                                         pd_vopl {
  84                                                 reg = <RK3399_PD_VOPL>;
  85                                         };
  86                                 };
  87                         };
  88                 };
  89
  90 Node of a device using power domains must have a power-domains property,
  91 containing a phandle to the power device node and an index specifying which
  92 power domain to use.
  93 The index should use macros in:
  94         "include/dt-bindings/power/rk3288-power.h" - for rk3288 type power domain.
  95         "include/dt-bindings/power/rk3328-power.h" - for rk3328 type power domain.
  96         "include/dt-bindings/power/rk3368-power.h" - for rk3368 type power domain.
  97         "include/dt-bindings/power/rk3399-power.h" - for rk3399 type power domain.
  98
  99 Example of the node using power domain:
 100
 101         node {
 102                 /* ... */
 103                 power-domains = <&power RK3288_PD_GPU>;
 104                 /* ... */
 105         };
 106
 107         node {
 108                 /* ... */
 109                 power-domains = <&power RK3368_PD_GPU_1>;
 110                 /* ... */
 111         };
 112
 113         node {
 114                 /* ... */
 115                 power-domains = <&power RK3399_PD_VOPB>;
 116                 /* ... */
 117         };