watchdog: Add tegra watchdog

Add a driver for the hardware watchdogs in NVIDIA Tegra SoCs (Tegra30 and
later).  This driver will configure one watchdog timer that will reset the
system in the case of a watchdog timeout.

This driver binds to the nvidia,tegra30-timer device node and gets its
register base from there.

Signed-off-by: Andrew Chew <achew@nvidia.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Tested-by: Stephen Warren <swarren@nvidia.com>
Reviewed-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

1 files changed, 5 insertions, 0 deletions

diff --git a/Documentation/watchdog/watchdog-parameters.txt b/Documentation/watchdog/watchdog-parameters.txt
index f9492fed4104..b39f35596ba2 100644
--- a/Documentation/watchdog/watchdog-parameters.txt
+++ b/Documentation/watchdog/watchdog-parameters.txt
@@ -325,6 +325,11 @@ soft_noboot: Softdog action, set to 1 to ignore reboots, 0 to reboot
 stmp3xxx_wdt:
 heartbeat: Watchdog heartbeat period in seconds from 1 to 4194304, default 19
 -------------------------------------------------
+tegra_wdt:
+heartbeat: Watchdog heartbeats in seconds. (default = 120)
+nowayout: Watchdog cannot be stopped once started
+        (default=kernel config parameter)
+-------------------------------------------------
 ts72xx_wdt:
 timeout: Watchdog timeout in seconds. (1 <= timeout <= 8, default=8)
 nowayout: Disable watchdog shutdown on close