[PATCH 1/2] dt-bindings: watchdog: aspeed: External reset signal properties

From: Andrew Jeffery
Date: Wed Aug 02 2017 - 00:46:16 EST

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@xxxxxxxx>
Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)

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.