projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| d8e03643 MZ |
1 | * ARM Timer Watchdog |
| 2 | ||
| 3 | ARM 11MP, Cortex-A5 and Cortex-A9 are often associated with a per-core | |
| 4 | Timer-Watchdog (aka TWD), which provides both a per-cpu local timer | |
| 5 | and watchdog. | |
| 6 | ||
| 7 | The TWD is usually attached to a GIC to deliver its two per-processor | |
| 8 | interrupts. | |
| 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 | ||
| 194444c5 MG |
22 | Optional |
| 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 | ||
| d8e03643 MZ |
27 | Example: |
| 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 | ||
| 47 | Example: | |
| 48 | ||
| 49 | twd-watchdog@2c000620 { | |
| 50 | compatible = "arm,arm11mp-twd-wdt"; | |
| 51 | reg = <0x2c000620 0x20>; | |
| 52 | interrupts = <1 14 0xf01>; | |
| 53 | }; |