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| author |   Andrew Jeffery <andrew@aj.id.au> | 2017-08-02 14:15:28 +0930 |
|---|---|---|
| committer |   Wim Van Sebroeck <wim@iguana.be> | 2017-09-09 21:05:04 +0200 |
| commit | e654f19165483adfc30eeabe69a1efc23182bf0e (patch) | |
| tree | 2d8179e6d051c335e037ef0305d44ae6692dabd4 /Documentation | |
| parent | drivers/watchdog: Add optional ASPEED device tree properties (diff) | |
| download | linux-dev-e654f19165483adfc30eeabe69a1efc23182bf0e.tar.xz linux-dev-e654f19165483adfc30eeabe69a1efc23182bf0e.zip | |
dt-bindings: watchdog: aspeed: External reset signal properties
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>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt b/Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt index 2b34ce9b60b9..c5077a1f5cb3 100644 --- a/Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt +++ b/Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt @@ -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: |