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dt-bindings: watchdog: aspeed: External reset signal properties

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For the AST2500 and compatible watchdog controllers the external reset
signal can be configured for push-pull or open-drain drive types, and in
the case of push-pull driving, active low or high.

Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Acked-by: Rob Herring <robh@kernel.org>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
This commit is contained in:
Andrew Jeffery 2017-08-02 14:15:28 +09:30 committed by Wim Van Sebroeck
parent ffbb29d62d
commit e654f19165
1 changed files with 9 additions and 1 deletions
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10
Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt
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@ -33,10 +33,18 @@ Optional properties:
- none: No reset is performed on timeout. Assumes another watchdog - none: No reset is performed on timeout. Assumes another watchdog
engine is responsible for this. engine is responsible for this.
- aspeed,alt-boot: If property is present then boot from alternate block.
- aspeed,external-signal: If property is present then signal is sent to - aspeed,external-signal: If property is present then signal is sent to
external reset counter (only WDT1 and WDT2). If not external reset counter (only WDT1 and WDT2). If not
specified no external signal is sent. specified no external signal is sent.
- aspeed,alt-boot: If property is present then boot from alternate block. - aspeed,ext-pulse-duration: External signal pulse duration in microseconds
Optional properties for AST2500-compatible watchdogs:
- aspeed,ext-push-pull: If aspeed,external-signal is present, set the pin's
drive type to push-pull. The default is open-drain.
- aspeed,ext-active-high: If aspeed,external-signal is present and and the pin
is configured as push-pull, then set the pulse
polarity to active-high. The default is active-low.
Example: Example: