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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
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
external reset counter (only WDT1 and WDT2). If not
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: