Kernel-4.18.0-80.el8_arm,tw

• ARM Timer Watchdog

ARM 11MP, Cortex-A5 and Cortex-A9 are often associated with a per-core
Timer-Watchdog (aka TWD), which provides both a per-cpu local timer
and watchdog.

The TWD is usually attached to a GIC to deliver its two per-processor
interrupts.

** Timer node required properties:

• compatible : Should be one of:
  “arm,cortex-a9-twd-timer”
  “arm,cortex-a5-twd-timer”
  “arm,arm11mp-twd-timer”

• interrupts : One interrupt to each core

• reg : Specify the base address and the size of the TWD timer
  register window.

Optional

• always-on : a boolean property. If present, the timer is powered through
  an always-on power domain, therefore it never loses context.

Example:

twd-timer@2c000600 {
    compatible = "arm,arm11mp-twd-timer"";
    reg = <0x2c000600 0x20>;
    interrupts = <1 13 0xf01>;
};

** Watchdog node properties:

• compatible : Should be one of:
  “arm,cortex-a9-twd-wdt”
  “arm,cortex-a5-twd-wdt”
  “arm,arm11mp-twd-wdt”

• interrupts : One interrupt to each core

• reg : Specify the base address and the size of the TWD watchdog
  register window.

Example:

twd-watchdog@2c000620 {
    compatible = "arm,arm11mp-twd-wdt";
    reg = <0x2c000620 0x20>;
    interrupts = <1 14 0xf01>;
};