4 The TI AM33xx and AM43xx family of devices use a small Cortex M3 co-processor
5 (commonly referred to as Wakeup M3 or CM3) to help with various low power tasks
6 that cannot be controlled from the MPU, like suspend/resume and certain deep
7 C-states for CPU Idle. Once the wkup_m3_ipc driver uses the wkup_m3_rproc driver
8 to boot the wkup_m3, it handles communication with the CM3 using IPC registers
9 present in the SoC's control module and a mailbox. The wkup_m3_ipc exposes an
10 API to allow the SoC PM code to execute specific PM tasks.
14 A wkup_m3_ipc device node is used to represent the IPC registers within an
19 - compatible: Should be,
20 "ti,am3352-wkup-m3-ipc" for AM33xx SoCs
21 "ti,am4372-wkup-m3-ipc" for AM43xx SoCs
22 - reg: Contains the IPC register address space to communicate
23 with the Wakeup M3 processor
24 - interrupts: Contains the interrupt information for the wkup_m3
25 interrupt that signals the MPU.
26 - ti,rproc: phandle to the wkup_m3 rproc node so the IPC driver
28 - mboxes: phandles used by IPC framework to get correct mbox
29 channel for communication. Must point to appropriate
30 mbox_wkupm3 child node.
35 l4_wkup: l4_wkup@44c00000 {
39 compatible = "ti,am3-scm", "simple-bus";
40 reg = <0x210000 0x2000>;
43 ranges = <0 0x210000 0x2000>;
47 wkup_m3_ipc: wkup_m3_ipc@1324 {
48 compatible = "ti,am3352-wkup-m3-ipc";
51 ti,rproc = <&wkup_m3>;
52 mboxes = <&mailbox &mbox_wkupm3>;