[PATCH linux dev-4.10 v2 2/4] dt-bindings: watchdog: aspeed: External reset signal properties

[Andrew Jeffery]

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 | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt b/Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt
index f526b003b2e0..fa661319a080 100644
--- a/Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt
+++ b/Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt
@@ -41,6 +41,13 @@ Optional properties:
 			specified no external signal is sent.
  - aspeed,alt-boot:    If property is present then boot from alternate block.
 
+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 open-drain, then set the pulse
+			   polarity to active-high. The default is active-low.
+
 Example:
 
 	wdt1: watchdog at 1e785000 {
-- 
2.11.0