linux-kernel - [PATCH 1/2] dt-bindings: watchdog: gpio-wdt: add "start-at-boot"

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Message-Id: <20210421162621.24910-2-francesco.zanella@vimar.com>
Date:   Wed, 21 Apr 2021 18:26:20 +0200
From:   Francesco Zanella <francesco.zanella@...ar.com>
To:     linux-watchdog@...r.kernel.org, wim@...ux-watchdog.org,
        linux@...ck-us.net
Cc:     devicetree@...r.kernel.org, robh+dt@...nel.org,
        linux-kernel@...r.kernel.org,
        Francesco Zanella <francesco.zanella@...ar.com>
Subject: [PATCH 1/2] dt-bindings: watchdog: gpio-wdt: add "start-at-boot"

Documentation for new device tree property "start-at-boot".

Signed-off-by: Francesco Zanella <francesco.zanella@...ar.com>
---
 Documentation/devicetree/bindings/watchdog/gpio-wdt.txt | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Documentation/devicetree/bindings/watchdog/gpio-wdt.txt b/Documentation/devicetree/bindings/watchdog/gpio-wdt.txt
index 198794963786..cdaf7f0602e8 100644
--- a/Documentation/devicetree/bindings/watchdog/gpio-wdt.txt
+++ b/Documentation/devicetree/bindings/watchdog/gpio-wdt.txt
@@ -17,6 +17,13 @@ Optional Properties:
 - always-running: If the watchdog timer cannot be disabled, add this flag to
   have the driver keep toggling the signal without a client. It will only cease
   to toggle the signal when the device is open and the timeout elapsed.
+- start-at-boot: Start pinging hw watchdog at probe, in order to take advantage
+  of kernel configs:
+  - WATCHDOG_HANDLE_BOOT_ENABLED: Avoid possible reboot if hw watchdog was been
+    enabled before the kernel (by uboot for example) and userspace doesn't take
+    control of /dev/watchdog in time;
+  - WATCHDOG_OPEN_TIMEOUT: Reboot if userspace doesn't take control of
+    /dev/watchdog within the timeout.
 
 Example:
 	watchdog: watchdog {
-- 
2.17.1