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authorAndrew Jeffery <andrew@aj.id.au>2017-08-02 06:45:28 +0200
committerWim Van Sebroeck <wim@iguana.be>2017-09-09 21:05:04 +0200
commite654f19165483adfc30eeabe69a1efc23182bf0e (patch)
tree2d8179e6d051c335e037ef0305d44ae6692dabd4 /Documentation
parentdrivers/watchdog: Add optional ASPEED device tree properties (diff)
downloadlinux-e654f19165483adfc30eeabe69a1efc23182bf0e.tar.xz
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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.txt10
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: