1 Texas Instruments TI SCI Generic Power Domain 2 ============================================= 3 4 Some TI SoCs contain a system controller (like the SYSFW, etc...) that is 5 responsible for controlling the state of the IPs that are present. 6 Communication between the host processor running an OS and the system 7 controller happens through a protocol known as TI SCI [1]. 8 9 [1] http://processors.wiki.ti.com/index.php/TISCI 10 11 PM Domain Node 12 ============== 13 The PM domain node represents the global PM domain managed by the SYSFW. Because 14 this relies on the TI SCI protocol to communicate with the SYSFW it must be a 15 child of the sysfw node. 16 17 Required Properties: 18 -------------------- 19 - compatible: Must be "ti,sci-pm-domain" 20 - #power-domain-cells: Must be 1 so that an id can be provided in each 21 device node. 22 23 Example (AM65x): 24 ---------------- 25 sysfw: sysfw { 26 compatible = "ti,am654-system-controller"; 27 ... 28 k3_pds: power-controller { 29 compatible = "ti,sci-pm-domain"; 30 #power-domain-cells = <1>; 31 }; 32 }; 33 34 PM Domain Consumers 35 =================== 36 Hardware blocks belonging to a PM domain should contain a "power-domains" 37 property that is a phandle pointing to the corresponding PM domain node 38 along with an index representing the device id to be passed to the PMMC 39 for device control. 40 41 Required Properties: 42 -------------------- 43 - power-domains: phandle pointing to the corresponding PM domain node 44 and an ID representing the device. 45 46 Example (AM65x): 47 ---------------- 48 uart2: serial@02800000 { 49 compatible = "ti,omap4-uart"; 50 ... 51 power-domains = <&k3_pds 0x3f>; 52 }; 53