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65 lines
2.1 KiB
65 lines
2.1 KiB
Texas Instruments TI-SCI Generic Power Domain |
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--------------------------------------------- |
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Some TI SoCs contain a system controller (like the PMMC, etc...) that is |
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responsible for controlling the state of the IPs that are present. |
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Communication between the host processor running an OS and the system |
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controller happens through a protocol known as TI-SCI [1]. |
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[1] Documentation/devicetree/bindings/arm/keystone/ti,sci.txt |
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PM Domain Node |
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============== |
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The PM domain node represents the global PM domain managed by the PMMC, which |
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in this case is the implementation as documented by the generic PM domain |
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bindings in Documentation/devicetree/bindings/power/power-domain.yaml. Because |
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this relies on the TI SCI protocol to communicate with the PMMC it must be a |
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child of the pmmc node. |
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Required Properties: |
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-------------------- |
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- compatible: should be "ti,sci-pm-domain" |
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- #power-domain-cells: Can be one of the following: |
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1: Containing the device id of each node |
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2: First entry should be device id |
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Second entry should be one of the floowing: |
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TI_SCI_PD_EXCLUSIVE: To allow device to be |
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exclusively controlled by |
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the requesting hosts. |
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TI_SCI_PD_SHARED: To allow device to be shared |
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by multiple hosts. |
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Example (K2G): |
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------------- |
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pmmc: pmmc { |
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compatible = "ti,k2g-sci"; |
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... |
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k2g_pds: power-controller { |
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compatible = "ti,sci-pm-domain"; |
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#power-domain-cells = <1>; |
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}; |
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}; |
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PM Domain Consumers |
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=================== |
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Hardware blocks belonging to a PM domain should contain a "power-domains" |
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property that is a phandle pointing to the corresponding PM domain node |
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along with an index representing the device id to be passed to the PMMC |
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for device control. |
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Required Properties: |
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-------------------- |
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- power-domains: phandle pointing to the corresponding PM domain node |
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and an ID representing the device. |
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See http://processors.wiki.ti.com/index.php/TISCI#66AK2G02_Data for the list |
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of valid identifiers for k2g. |
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Example (K2G): |
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-------------------- |
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uart0: serial@2530c00 { |
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compatible = "ns16550a"; |
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... |
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power-domains = <&k2g_pds 0x002c>; |
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};
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