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Diffstat (limited to 'Documentation/devicetree/bindings/soc/ti/sci-pm-domain.txt')
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diff --git a/Documentation/devicetree/bindings/soc/ti/sci-pm-domain.txt b/Documentation/devicetree/bindings/soc/ti/sci-pm-domain.txt new file mode 100644 index 000000000..6217e6430 --- /dev/null +++ b/Documentation/devicetree/bindings/soc/ti/sci-pm-domain.txt @@ -0,0 +1,65 @@ +Texas Instruments TI-SCI Generic Power Domain +--------------------------------------------- + +Some TI SoCs contain a system controller (like the PMMC, etc...) that is +responsible for controlling the state of the IPs that are present. +Communication between the host processor running an OS and the system +controller happens through a protocol known as TI-SCI [1]. + +[1] Documentation/devicetree/bindings/arm/keystone/ti,sci.txt + +PM Domain Node +============== +The PM domain node represents the global PM domain managed by the PMMC, which +in this case is the implementation as documented by the generic PM domain +bindings in Documentation/devicetree/bindings/power/power-domain.yaml. Because +this relies on the TI SCI protocol to communicate with the PMMC it must be a +child of the pmmc node. + +Required Properties: +-------------------- +- compatible: should be "ti,sci-pm-domain" +- #power-domain-cells: Can be one of the following: + 1: Containing the device id of each node + 2: First entry should be device id + Second entry should be one of the floowing: + TI_SCI_PD_EXCLUSIVE: To allow device to be + exclusively controlled by + the requesting hosts. + TI_SCI_PD_SHARED: To allow device to be shared + by multiple hosts. + +Example (K2G): +------------- + pmmc: pmmc { + compatible = "ti,k2g-sci"; + ... + + k2g_pds: power-controller { + compatible = "ti,sci-pm-domain"; + #power-domain-cells = <1>; + }; + }; + +PM Domain Consumers +=================== +Hardware blocks belonging to a PM domain should contain a "power-domains" +property that is a phandle pointing to the corresponding PM domain node +along with an index representing the device id to be passed to the PMMC +for device control. + +Required Properties: +-------------------- +- power-domains: phandle pointing to the corresponding PM domain node + and an ID representing the device. + +See http://processors.wiki.ti.com/index.php/TISCI#66AK2G02_Data for the list +of valid identifiers for k2g. + +Example (K2G): +-------------------- + uart0: serial@2530c00 { + compatible = "ns16550a"; + ... + power-domains = <&k2g_pds 0x002c>; + }; |