xref: /freebsd/sys/contrib/device-tree/Bindings/timer/arm,twd.txt (revision c66ec88fed842fbaad62c30d510644ceb7bd2d71) 
1* ARM Timer Watchdog
2
3ARM 11MP, Cortex-A5 and Cortex-A9 are often associated with a per-core
4Timer-Watchdog (aka TWD), which provides both a per-cpu local timer
5and watchdog.
6
7The TWD is usually attached to a GIC to deliver its two per-processor
8interrupts.
9
10** Timer node required properties:
11
12- compatible : Should be one of:
13	"arm,cortex-a9-twd-timer"
14	"arm,cortex-a5-twd-timer"
15	"arm,arm11mp-twd-timer"
16
17- interrupts : One interrupt to each core
18
19- reg : Specify the base address and the size of the TWD timer
20	register window.
21
22Optional
23
24- always-on : a boolean property. If present, the timer is powered through
25  an always-on power domain, therefore it never loses context.
26
27Example:
28
29	twd-timer@2c000600 {
30		compatible = "arm,arm11mp-twd-timer"";
31		reg = <0x2c000600 0x20>;
32		interrupts = <1 13 0xf01>;
33	};
34
35** Watchdog node properties:
36
37- compatible : Should be one of:
38	"arm,cortex-a9-twd-wdt"
39	"arm,cortex-a5-twd-wdt"
40	"arm,arm11mp-twd-wdt"
41
42- interrupts : One interrupt to each core
43
44- reg : Specify the base address and the size of the TWD watchdog
45	register window.
46
47Example:
48
49	twd-watchdog@2c000620 {
50		compatible = "arm,arm11mp-twd-wdt";
51		reg = <0x2c000620 0x20>;
52		interrupts = <1 14 0xf01>;
53	};
54