133 lines
4.3 KiB
Plaintext
133 lines
4.3 KiB
Plaintext
* Rockchip Power Domains
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Rockchip processors include support for multiple power domains which can be
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powered up/down by software based on different application scenes to save power.
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Required properties for power domain controller:
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- compatible: Should be one of the following.
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"rockchip,px30-power-controller" - for PX30 SoCs.
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"rockchip,rk3036-power-controller" - for RK3036 SoCs.
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"rockchip,rk3128-power-controller" - for RK3128 SoCs.
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"rockchip,rk3228-power-controller" - for RK3228 SoCs.
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"rockchip,rk3288-power-controller" - for RK3288 SoCs.
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"rockchip,rk3328-power-controller" - for RK3328 SoCs.
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"rockchip,rk3366-power-controller" - for RK3366 SoCs.
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"rockchip,rk3368-power-controller" - for RK3368 SoCs.
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"rockchip,rk3399-power-controller" - for RK3399 SoCs.
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- #power-domain-cells: Number of cells in a power-domain specifier.
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Should be 1 for multiple PM domains.
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- #address-cells: Should be 1.
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- #size-cells: Should be 0.
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Required properties for power domain sub nodes:
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- reg: index of the power domain, should use macros in:
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"include/dt-bindings/power/px30-power.h" - for PX30 type power domain.
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"include/dt-bindings/power/rk3036-power.h" - for RK3036 type power domain.
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"include/dt-bindings/power/rk3128-power.h" - for RK3128 type power domain.
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"include/dt-bindings/power/rk3228-power.h" - for RK3228 type power domain.
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"include/dt-bindings/power/rk3288-power.h" - for RK3288 type power domain.
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"include/dt-bindings/power/rk3328-power.h" - for RK3328 type power domain.
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"include/dt-bindings/power/rk3366-power.h" - for RK3366 type power domain.
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"include/dt-bindings/power/rk3368-power.h" - for RK3368 type power domain.
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"include/dt-bindings/power/rk3399-power.h" - for RK3399 type power domain.
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- clocks (optional): phandles to clocks which need to be enabled while power domain
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switches state.
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- pm_qos (optional): phandles to qos blocks which need to be saved and restored
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while power domain switches state.
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Qos Example:
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qos_gpu: qos_gpu@ffaf0000 {
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compatible ="syscon";
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reg = <0x0 0xffaf0000 0x0 0x20>;
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};
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Example:
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power: power-controller {
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compatible = "rockchip,rk3288-power-controller";
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#power-domain-cells = <1>;
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#address-cells = <1>;
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#size-cells = <0>;
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pd_gpu {
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reg = <RK3288_PD_GPU>;
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clocks = <&cru ACLK_GPU>;
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pm_qos = <&qos_gpu>;
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};
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};
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power: power-controller {
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compatible = "rockchip,rk3368-power-controller";
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#power-domain-cells = <1>;
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#address-cells = <1>;
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#size-cells = <0>;
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pd_gpu_1 {
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reg = <RK3368_PD_GPU_1>;
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clocks = <&cru ACLK_GPU_CFG>;
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};
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};
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Example 2:
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power: power-controller {
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compatible = "rockchip,rk3399-power-controller";
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#power-domain-cells = <1>;
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#address-cells = <1>;
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#size-cells = <0>;
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pd_vio {
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#address-cells = <1>;
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#size-cells = <0>;
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reg = <RK3399_PD_VIO>;
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pd_vo {
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#address-cells = <1>;
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#size-cells = <0>;
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reg = <RK3399_PD_VO>;
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pd_vopb {
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reg = <RK3399_PD_VOPB>;
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};
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pd_vopl {
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reg = <RK3399_PD_VOPL>;
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};
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};
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};
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};
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Node of a device using power domains must have a power-domains property,
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containing a phandle to the power device node and an index specifying which
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power domain to use.
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The index should use macros in:
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"include/dt-bindings/power/px30-power.h" - for px30 type power domain.
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"include/dt-bindings/power/rk3036-power.h" - for rk3036 type power domain.
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"include/dt-bindings/power/rk3128-power.h" - for rk3128 type power domain.
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"include/dt-bindings/power/rk3128-power.h" - for rk3228 type power domain.
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"include/dt-bindings/power/rk3288-power.h" - for rk3288 type power domain.
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"include/dt-bindings/power/rk3328-power.h" - for rk3328 type power domain.
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"include/dt-bindings/power/rk3366-power.h" - for rk3366 type power domain.
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"include/dt-bindings/power/rk3368-power.h" - for rk3368 type power domain.
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"include/dt-bindings/power/rk3399-power.h" - for rk3399 type power domain.
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Example of the node using power domain:
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node {
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/* ... */
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power-domains = <&power RK3288_PD_GPU>;
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/* ... */
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};
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node {
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/* ... */
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power-domains = <&power RK3368_PD_GPU_1>;
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/* ... */
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};
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node {
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/* ... */
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power-domains = <&power RK3399_PD_VOPB>;
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/* ... */
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};
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