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ccbbb9fa DG |
1 | TI Wakeup M3 Remoteproc Driver |
2 | ============================== | |
3 | ||
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. This CM3 processor requires a firmware | |
7 | binary to accomplish this. The wkup_m3 remoteproc driver handles the loading of | |
8 | the firmware and booting of the CM3. | |
9 | ||
10 | Wkup M3 Device Node: | |
11 | ==================== | |
12 | A wkup_m3 device node is used to represent the Wakeup M3 processor instance | |
13 | within the SoC. It is added as a child node of the parent interconnect bus | |
14 | (l4_wkup) through which it is accessible to the MPU. | |
15 | ||
16 | Required properties: | |
17 | -------------------- | |
18 | - compatible: Should be one of, | |
19 | "ti,am3352-wkup-m3" for AM33xx SoCs | |
20 | "ti,am4372-wkup-m3" for AM43xx SoCs | |
21 | - reg: Should contain the address ranges for the two internal | |
22 | memory regions, UMEM and DMEM. The parent node should | |
23 | provide an appropriate ranges property for properly | |
24 | translating these into bus addresses. | |
25 | - reg-names: Contains the corresponding names for the two memory | |
26 | regions. These should be named "umem" & "dmem". | |
27 | - ti,hwmods: Name of the hwmod associated with the wkupm3 device. | |
28 | - ti,pm-firmware: Name of firmware file to be used for loading and | |
29 | booting the wkup_m3 remote processor. | |
30 | ||
31 | Example: | |
32 | -------- | |
33 | /* AM33xx */ | |
34 | ocp { | |
35 | l4_wkup: l4_wkup@44c00000 { | |
36 | compatible = "am335-l4-wkup", "simple-bus"; | |
37 | ranges = <0 0x44c00000 0x400000>; | |
38 | #address-cells = <1>; | |
39 | #size-cells = <1>; | |
40 | ||
41 | wkup_m3: wkup_m3@100000 { | |
42 | compatible = "ti,am3352-wkup-m3"; | |
43 | reg = <0x100000 0x4000>, | |
44 | <0x180000 0x2000>; | |
45 | reg-names = "umem", "dmem"; | |
46 | ti,hwmods = "wkup_m3"; | |
47 | ti,pm-firmware = "am335x-pm-firmware.elf"; | |
48 | }; | |
49 | }; | |
50 | ||
51 | ... | |
52 | }; |