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authorLinus Torvalds <torvalds@linux-foundation.org>2019-03-11 21:22:15 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2019-03-11 21:22:15 +0300
commita089e4fed5c5e8717f233d71bb750fbf9e1f38e0 (patch)
treee34611231af2b4bb0261864691b7f3618e101b33 /Documentation
parentcf0240a755b8b3df51b0b857b03309a666611d58 (diff)
parent458c8961c194f2d2cb6ffed3dd9b6692d74ad65e (diff)
downloadlinux-a089e4fed5c5e8717f233d71bb750fbf9e1f38e0.tar.xz
Merge tag 'linux-watchdog-5.1-rc1' of git://www.linux-watchdog.org/linux-watchdog
Pull watchdog updates from Wim Van Sebroeck: - a new watchdog driver for the Mellanox systems - renesas-wdt: Document r8a77470 support - numerous 'Mark expected switch fall-throughs' - qcom: Add suspend/resume support - some small fixes and documentation updates * tag 'linux-watchdog-5.1-rc1' of git://www.linux-watchdog.org/linux-watchdog: watchdog: w83877f_wdt: Mark expected switch fall-through watchdog: sc520_wdt: Mark expected switch fall-through watchdog: sbc60xxwdt: Mark expected switch fall-through watchdog: smsc37b787_wdt: Mark expected switch fall-through watchdog: sc1200: Mark expected switch fall-through watchdog: pc87413: Mark expected switch fall-through Documentation/watchdog: Add documentation mlx-wdt driver watchdog: mlx-wdt: introduce a watchdog driver for Mellanox systems. platform_data/mlxreg: additions for Mellanox watchdog driver. watchdog: Update sysfs documentation. watchdog: dw: remove useless pr_fmt watchdog: pika_wdt: drop pointless static qualifier in pikawdt_init watchdog/hpwdt: Update Kconfig documentation dt-bindings: watchdog: renesas-wdt: Document r8a77470 support watchdog: qcom: Add suspend/resume support
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/ABI/testing/sysfs-class-watchdog23
-rw-r--r--Documentation/devicetree/bindings/watchdog/renesas-wdt.txt1
-rw-r--r--Documentation/watchdog/mlx-wdt.txt52
3 files changed, 76 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-class-watchdog b/Documentation/ABI/testing/sysfs-class-watchdog
index 736046b33040..6317ade5ad19 100644
--- a/Documentation/ABI/testing/sysfs-class-watchdog
+++ b/Documentation/ABI/testing/sysfs-class-watchdog
@@ -49,3 +49,26 @@ Contact: Wim Van Sebroeck <wim@iguana.be>
Description:
It is a read only file. It is read to know about current
value of timeout programmed.
+
+What: /sys/class/watchdog/watchdogn/pretimeout
+Date: December 2016
+Contact: Wim Van Sebroeck <wim@iguana.be>
+Description:
+ It is a read only file. It specifies the time in seconds before
+ timeout when the pretimeout interrupt is delivered. Pretimeout
+ is an optional feature.
+
+What: /sys/class/watchdog/watchdogn/pretimeout_avaialable_governors
+Date: February 2017
+Contact: Wim Van Sebroeck <wim@iguana.be>
+Description:
+ It is a read only file. It shows the pretimeout governors
+ available for this watchdog.
+
+What: /sys/class/watchdog/watchdogn/pretimeout_governor
+Date: February 2017
+Contact: Wim Van Sebroeck <wim@iguana.be>
+Description:
+ It is a read/write file. When read, the currently assigned
+ pretimeout governor is returned. When written, it sets
+ the pretimeout governor.
diff --git a/Documentation/devicetree/bindings/watchdog/renesas-wdt.txt b/Documentation/devicetree/bindings/watchdog/renesas-wdt.txt
index ef2b97b72e08..9f365c1a3399 100644
--- a/Documentation/devicetree/bindings/watchdog/renesas-wdt.txt
+++ b/Documentation/devicetree/bindings/watchdog/renesas-wdt.txt
@@ -8,6 +8,7 @@ Required properties:
- "renesas,r8a7743-wdt" (RZ/G1M)
- "renesas,r8a7744-wdt" (RZ/G1N)
- "renesas,r8a7745-wdt" (RZ/G1E)
+ - "renesas,r8a77470-wdt" (RZ/G1C)
- "renesas,r8a774a1-wdt" (RZ/G2M)
- "renesas,r8a774c0-wdt" (RZ/G2E)
- "renesas,r8a7790-wdt" (R-Car H2)
diff --git a/Documentation/watchdog/mlx-wdt.txt b/Documentation/watchdog/mlx-wdt.txt
new file mode 100644
index 000000000000..66eeb78505c3
--- /dev/null
+++ b/Documentation/watchdog/mlx-wdt.txt
@@ -0,0 +1,52 @@
+ Mellanox watchdog drivers
+ for x86 based system switches
+
+This driver provides watchdog functionality for various Mellanox
+Ethernet and Infiniband switch systems.
+
+Mellanox watchdog device is implemented in a programmable logic device.
+
+There are 2 types of HW watchdog implementations.
+
+Type 1:
+Actual HW timeout can be defined as a power of 2 msec.
+e.g. timeout 20 sec will be rounded up to 32768 msec.
+The maximum timeout period is 32 sec (32768 msec.),
+Get time-left isn't supported
+
+Type 2:
+Actual HW timeout is defined in sec. and it's the same as
+a user-defined timeout.
+Maximum timeout is 255 sec.
+Get time-left is supported.
+
+Type 1 HW watchdog implementation exist in old systems and
+all new systems have type 2 HW watchdog.
+Two types of HW implementation have also different register map.
+
+Mellanox system can have 2 watchdogs: main and auxiliary.
+Main and auxiliary watchdog devices can be enabled together
+on the same system.
+There are several actions that can be defined in the watchdog:
+system reset, start fans on full speed and increase register counter.
+The last 2 actions are performed without a system reset.
+Actions without reset are provided for auxiliary watchdog device,
+which is optional.
+Watchdog can be started during a probe, in this case it will be
+pinged by watchdog core before watchdog device will be opened by
+user space application.
+Watchdog can be initialised in nowayout way, i.e. oncse started
+it can't be stopped.
+
+This mlx-wdt driver supports both HW watchdog implementations.
+
+Watchdog driver is probed from the common mlx_platform driver.
+Mlx_platform driver provides an appropriate set of registers for
+Mellanox watchdog device, identity name (mlx-wdt-main or mlx-wdt-aux),
+initial timeout, performed action in expiration and configuration flags.
+watchdog configuration flags: nowayout and start_at_boot, hw watchdog
+version - type1 or type2.
+The driver checks during initialization if the previous system reset
+was done by the watchdog. If yes, it makes a notification about this event.
+
+Access to HW registers is performed through a generic regmap interface.