71daabca34
Rockchip Socs contain quality of service (qos) blocks managing priority, bandwidth, etc of the connection of each domain to the interconnect. These blocks loose state when their domain gets disabled and therefore need to be saved when disabling and restored when enabling a power-domain. These qos blocks also are similar over all currently available Rockchip SoCs. Signed-off-by: Elaine Zhang <zhangqing@rock-chips.com> Signed-off-by: Heiko Stuebner <heiko@sntech.de>
115 lines
3.1 KiB
Plaintext
115 lines
3.1 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,rk3288-power-controller" - for RK3288 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/rk3288-power.h" - for RK3288 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/rk3288-power.h" - for rk3288 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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