aspeed-wdt.txt

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    1 Aspeed Watchdog Timer
    2 
    3 Required properties:
    4  - compatible: must be one of:
    5         - "aspeed,ast2400-wdt"
    6         - "aspeed,ast2500-wdt"
    7         - "aspeed,ast2600-wdt"
    8 
    9  - reg: physical base address of the controller and length of memory mapped
   10    region
   11 
   12 Optional properties:
   13 
   14  - aspeed,reset-type = "cpu|soc|system|none"
   15 
   16    Reset behavior - Whenever a timeout occurs the watchdog can be programmed
   17    to generate one of three different, mutually exclusive, types of resets.
   18 
   19    Type "none" can be specified to indicate that no resets are to be done.
   20    This is useful in situations where another watchdog engine on chip is
   21    to perform the reset.
   22 
   23    If 'aspeed,reset-type=' is not specified the default is to enable system
   24    reset.
   25 
   26    Reset types:
   27 
   28         - cpu: Reset CPU on watchdog timeout
   29 
   30         - soc: Reset 'System on Chip' on watchdog timeout
   31 
   32         - system: Reset system on watchdog timeout
   33 
   34         - none: No reset is performed on timeout. Assumes another watchdog
   35                 engine is responsible for this.
   36 
   37  - aspeed,alt-boot:    If property is present then boot from alternate block.
   38  - aspeed,external-signal: If property is present then signal is sent to
   39                         external reset counter (only WDT1 and WDT2). If not
   40                         specified no external signal is sent.
   41  - aspeed,ext-pulse-duration: External signal pulse duration in microseconds
   42 
   43 Optional properties for AST2500-compatible watchdogs:
   44  - aspeed,ext-push-pull: If aspeed,external-signal is present, set the pin's
   45                          drive type to push-pull. The default is open-drain.
   46  - aspeed,ext-active-high: If aspeed,external-signal is present and and the pin
   47                            is configured as push-pull, then set the pulse
   48                            polarity to active-high. The default is active-low.
   49 
   50 Example:
   51 
   52         wdt1: watchdog@1e785000 {
   53                 compatible = "aspeed,ast2400-wdt";
   54                 reg = <0x1e785000 0x1c>;
   55                 aspeed,reset-type = "system";
   56                 aspeed,external-signal;
   57         };

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FreeBSD/Linux Kernel Cross Reference sys/contrib/device-tree/Bindings/watchdog/aspeed-wdt.txt

FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/watchdog/aspeed-wdt.txt