[PATCH linux dev-4.10 v3 2/4] dt-bindings: watchdog: aspeed: External reset signal properties

Andrew Jeffery andrew at aj.id.au
Thu Jul 27 20:16:45 AEST 2017

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 open-drain driving, active low or high.

Signed-off-by: Andrew Jeffery <andrew at aj.id.au>
 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 f526b003b2e0..7aa885f620ef 100644
--- a/Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt
+++ b/Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt
@@ -36,10 +36,18 @@ Optional properties:
  - aspeed,interrupt:	If property is present then interrupt CPU.
 			If not specified then don't interrupt CPU.
+ - 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.

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