[PATCH V6 2/2] doc: mtk-wdt: support pre-timeout when the bark irq is available

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Add description of pre-timeout in mtk-wdt.

Signed-off-by: Wang Qing <wangqing@xxxxxxxx>
---
 Documentation/devicetree/bindings/watchdog/mtk-wdt.txt | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Documentation/devicetree/bindings/watchdog/mtk-wdt.txt b/Documentation/devicetree/bindings/watchdog/mtk-wdt.txt
index e36ba60..ae57d6c
--- a/Documentation/devicetree/bindings/watchdog/mtk-wdt.txt
+++ b/Documentation/devicetree/bindings/watchdog/mtk-wdt.txt
@@ -1,5 +1,8 @@
 Mediatek SoCs Watchdog timer
 
+The watchdog supports a pre-timeout interrupt that fires timeout-sec/2
+before the expiry.
+
 Required properties:
 
 - compatible should contain:
-- 
2.7.4




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