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authorLinus Torvalds <torvalds@linux-foundation.org>2019-07-18 20:47:59 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2019-07-18 20:47:59 +0300
commitd77e9e4e18ce9da3b4981a5c537979c42b06638c (patch)
tree9943873e735247b23636a0b51384729593b01db1 /Documentation/watchdog
parent2ae048e16636afd7521270acacb08d9c42fd23f0 (diff)
parent7fb832ae72949c883da52d6316ff08f03c75d300 (diff)
downloadlinux-d77e9e4e18ce9da3b4981a5c537979c42b06638c.tar.xz
Merge tag 'linux-watchdog-5.3-rc1' of git://www.linux-watchdog.org/linux-watchdog
Pull watchdog updates from Wim Van Sebroeck: - add Allwinner H6 watchdog - drop warning after registering device patches - hpwdt improvements - gpio: add support for nowayout option - introduce CONFIG_WATCHDOG_OPEN_TIMEOUT - convert remaining drivers to use SPDX license identifier - Fixes and improvements on several watchdog device drivers * tag 'linux-watchdog-5.3-rc1' of git://www.linux-watchdog.org/linux-watchdog: (74 commits) watchdog: digicolor_wdt: Remove unused variable in dc_wdt_probe watchdog: ie6xx_wdt: Use spinlock_t instead of struct spinlock watchdog: atmel: atmel-sama5d4-wdt: Disable watchdog on system suspend watchdog: convert remaining drivers to use SPDX license identifier dt-bindings: watchdog: Rename bindings documentation file watchdog: mei_wdt: no need to check return value of debugfs_create functions watchdog: bcm_kona_wdt: no need to check return value of debugfs_create functions docs: watchdog: Fix build error. docs: watchdog: convert docs to ReST and rename to *.rst watchdog: make the device time out at open_deadline when open_timeout is used watchdog: introduce CONFIG_WATCHDOG_OPEN_TIMEOUT watchdog: introduce watchdog.open_timeout commandline parameter dt-bindings: watchdog: move i.MX system controller watchdog binding to SCU watchdog: imx_sc: Add pretimeout support watchdog: renesas_wdt: Add a few cycles delay watchdog: gpio: add support for nowayout option watchdog: renesas_wdt: Use 'dev' instead of dereferencing it repeatedly dt-bindings: watchdog: add Allwinner H6 watchdog watchdog: jz4740: Avoid starting watchdog in set_timeout watchdog: jz4740: Use register names from <linux/mfd/ingenic-tcu.h> ...
Diffstat (limited to 'Documentation/watchdog')
-rw-r--r--Documentation/watchdog/hpwdt.rst4
-rw-r--r--Documentation/watchdog/watchdog-parameters.rst11
2 files changed, 15 insertions, 0 deletions
diff --git a/Documentation/watchdog/hpwdt.rst b/Documentation/watchdog/hpwdt.rst
index 94a96371113e..c165d92cfd12 100644
--- a/Documentation/watchdog/hpwdt.rst
+++ b/Documentation/watchdog/hpwdt.rst
@@ -39,6 +39,10 @@ Last reviewed: 08/20/2018
Default value is set when compiling the kernel. If it is set
to "Y", then there is no way of disabling the watchdog once
it has been started.
+ kdumptimeout Minimum timeout in seconds to apply upon receipt of an NMI
+ before calling panic. (-1) disables the watchdog. When value
+ is > 0, the timer is reprogrammed with the greater of
+ value or current timeout value.
============ ================================================================
NOTE:
diff --git a/Documentation/watchdog/watchdog-parameters.rst b/Documentation/watchdog/watchdog-parameters.rst
index b121caae7798..a3985cc5aeda 100644
--- a/Documentation/watchdog/watchdog-parameters.rst
+++ b/Documentation/watchdog/watchdog-parameters.rst
@@ -13,6 +13,17 @@ modules.
-------------------------------------------------
+watchdog core:
+ open_timeout:
+ Maximum time, in seconds, for which the watchdog framework will take
+ care of pinging a running hardware watchdog until userspace opens the
+ corresponding /dev/watchdogN device. A value of 0 means an infinite
+ timeout. Setting this to a non-zero value can be useful to ensure that
+ either userspace comes up properly, or the board gets reset and allows
+ fallback logic in the bootloader to try something else.
+
+-------------------------------------------------
+
acquirewdt:
wdt_stop:
Acquire WDT 'stop' io port (default 0x43)