Merge tag 'linux-watchdog-4.20-rc1' of git://www.linux-watchdog.org/linux-watchdog

Pull watchdog updates from Wim Van Sebroeck:

 - Add Armada 37xx CPU watchdog

 - w83627hf_wdt: Add Support for NCT6796D, NCT6797D, NCT6798D

 - hpwdt: several improvements

 - renesas_wdt: SPDX identifiers, stop when unregistering, support for
   R7S9210

 - rza_wdt: SPDX identifiers, support longer timeouts

 - core: fix null pointer dereference when releasing cdev

 - iTCO_wdt: Drop option vendorsupport=2

 - sama5d4: fix timeout-sec usage

 - lantiq_wdt: convert to watchdog framework

 - several small fixes

* tag 'linux-watchdog-4.20-rc1' of git://www.linux-watchdog.org/linux-watchdog: (30 commits)
  watchdog: ts4800: release syscon device node in ts4800_wdt_probe()
  watchdog: armada_37xx_wdt: use do_div for u64 division
  documentation: watchdog: add documentation for armada-37xx-wdt
  dt-bindings: watchdog: Document armada-37xx-wdt binding
  watchdog: Add support for Armada 37xx CPU watchdog
  dt-bindings: watchdog: add mpc8xxx-wdt support
  watchdog: mpc8xxx: provide boot status
  MAINTAINERS: Fix file pattern for MEN Z069 watchdog driver
  dt-bindings: watchdog: renesas-wdt: Add support for R7S9210
  watchdog: rza_wdt: Support longer timeouts
  watchdog: hpwdt: Disable PreTimeout when Timeout is smaller
  watchdog: w83627hf_wdt: Support NCT6796D, NCT6797D, NCT6798D
  watchdog: mpc8xxx: use dev_xxxx() instead of pr_xxxx()
  watchdog: lantiq: add get_timeleft callback
  watchdog: lantiq: Convert to watchdog_device
  watchdog: lantiq: update register names to better match spec
  watchdog: sama5d4: fix timeout-sec usage
  watchdog: fix a small number of "watchog" typos in comments
  watchdog: rza_wdt: convert to SPDX identifiers
  watchdog: iTCO_wdt: Remove unused hooks
  ...

5 files changed, 85 insertions, 62 deletions

diff --git a/Documentation/devicetree/bindings/watchdog/armada-37xx-wdt.txt b/Documentation/devicetree/bindings/watchdog/armada-37xx-wdt.txt
new file mode 100644
index 000000000000..a8d00c31a1d8
--- /dev/null
+++ b/Documentation/devicetree/bindings/watchdog/armada-37xx-wdt.txt
@@ -0,0 +1,23 @@
+* Armada 37xx CPU Watchdog Timer Controller
+
+Required properties:
+- compatible : must be "marvell,armada-3700-wdt"
+- reg : base physical address of the controller and length of memory mapped
+	region.
+- clocks : the clock feeding the watchdog timer. See clock-bindings.txt
+- marvell,system-controller : reference to syscon node for the CPU Miscellaneous
+	Registers
+
+Example:
+
+	cpu_misc: system-controller@d000 {
+		compatible = "marvell,armada-3700-cpu-misc", "syscon";
+		reg = <0xd000 0x1000>;
+	};
+
+	wdt: watchdog@8300 {
+		compatible = "marvell,armada-3700-wdt";
+		reg = <0x8300 0x40>;
+		marvell,system-controller = <&cpu_misc>;
+		clocks = <&xtalclk>;
+	};
diff --git a/Documentation/devicetree/bindings/watchdog/mpc8xxx-wdt.txt b/Documentation/devicetree/bindings/watchdog/mpc8xxx-wdt.txt
new file mode 100644
index 000000000000..a384ff5b3ce8
--- /dev/null
+++ b/Documentation/devicetree/bindings/watchdog/mpc8xxx-wdt.txt
@@ -0,0 +1,25 @@
+* Freescale mpc8xxx watchdog driver (For 83xx, 86xx and 8xx)
+
+Required properties:
+- compatible: Shall contain one of the following:
+	"mpc83xx_wdt" for an mpc83xx
+	"fsl,mpc8610-wdt" for an mpc86xx
+	"fsl,mpc823-wdt" for an mpc8xx
+- reg: base physical address and length of the area hosting the
+       watchdog registers.
+		On the 83xx, "Watchdog Timer Registers" area:	<0x200 0x100>
+		On the 86xx, "Watchdog Timer Registers" area:	<0xe4000 0x100>
+		On the 8xx, "General System Interface Unit" area: <0x0 0x10>
+
+Optional properties:
+- reg: additional physical address and length (4) of location of the
+       Reset Status Register (called RSTRSCR on the mpc86xx)
+		On the 83xx, it is located at offset 0x910
+		On the 86xx, it is located at offset 0xe0094
+		On the 8xx, it is located at offset 0x288
+
+Example:
+		WDT: watchdog@0 {
+		    compatible = "fsl,mpc823-wdt";
+		    reg = <0x0 0x10 0x288 0x4>;
+		};
diff --git a/Documentation/devicetree/bindings/watchdog/renesas-wdt.txt b/Documentation/devicetree/bindings/watchdog/renesas-wdt.txt
index d72d1181ec62..a8ee29fd9ac8 100644
--- a/Documentation/devicetree/bindings/watchdog/renesas-wdt.txt
+++ b/Documentation/devicetree/bindings/watchdog/renesas-wdt.txt
@@ -21,6 +21,7 @@ Required properties:
 	         - "renesas,r8a77990-wdt" (R-Car E3)
 	         - "renesas,r8a77995-wdt" (R-Car D3)
 	         - "renesas,r7s72100-wdt" (RZ/A1)
+	         - "renesas,r7s9210-wdt"  (RZ/A2)
 		The generic compatible string must be:
 		 - "renesas,rza-wdt" for RZ/A
 		 - "renesas,rcar-gen2-wdt" for R-Car Gen2 and RZ/G1
diff --git a/Documentation/watchdog/hpwdt.txt b/Documentation/watchdog/hpwdt.txt
index 6d866c537127..55df692c5595 100644
--- a/Documentation/watchdog/hpwdt.txt
+++ b/Documentation/watchdog/hpwdt.txt
@@ -1,15 +1,12 @@
-Last reviewed: 05/20/2016
+Last reviewed: 08/20/2018
 
                      HPE iLO NMI Watchdog Driver
-              NMI sourcing for iLO based ProLiant Servers
-                     Documentation and Driver by
-                         Thomas Mingarelli
+                   for iLO based ProLiant Servers
 
  The HPE iLO NMI Watchdog driver is a kernel module that provides basic
- watchdog functionality and the added benefit of NMI sourcing. Both the
- watchdog functionality and the NMI sourcing capability need to be enabled
- by the user. Remember that the two modes are not dependent on one another.
- A user can have the NMI sourcing without the watchdog timer and vice-versa.
+ watchdog functionality and handler for the iLO "Generate NMI to System"
+ virtual button.
+
  All references to iLO in this document imply it also works on iLO2 and all
  subsequent generations.
 
@@ -21,12 +18,16 @@ Last reviewed: 05/20/2016
  not be updated in a timely fashion and a hardware system reset (also known as
  an Automatic Server Recovery (ASR)) event will occur.
 
- The hpwdt driver also has three (3) module parameters. They are the following:
+ The hpwdt driver also has the following module parameters:
 
  soft_margin - allows the user to set the watchdog timer value.
                Default value is 30 seconds.
- allow_kdump - allows the user to save off a kernel dump image after an NMI.
-               Default value is 1/ON
+ timeout     - an alias of soft_margin.
+ pretimeout  - allows the user to set the watchdog pretimeout value.
+               This is the number of seconds before timeout when an
+               NMI is delivered to the system. Setting the value to
+               zero disables the pretimeout NMI.
+               Default value is 9 seconds.
  nowayout    - basic watchdog parameter that does not allow the timer to
                be restarted or an impending ASR to be escaped.
                Default value is set when compiling the kernel. If it is set
@@ -37,61 +38,29 @@ Last reviewed: 05/20/2016
        interface to /dev/watchdog can be found in
        Documentation/watchdog/watchdog-api.txt and Documentation/IPMI.txt.
 
- The NMI sourcing capability is disabled by default due to the inability to
- distinguish between "NMI Watchdog Ticks" and "HW generated NMI events" in the
- Linux kernel. What this means is that the hpwdt nmi handler code is called
- each time the NMI signal fires off. This could amount to several thousands of
- NMIs in a matter of seconds. If a user sees the Linux kernel's "dazed and
- confused" message in the logs or if the system gets into a hung state, then
- the hpwdt driver can be reloaded.
-
- 1. If the kernel has not been booted with nmi_watchdog turned off then
-    edit and place the nmi_watchdog=0 at the end of the currently booting
-    kernel line. Depending on your Linux distribution and platform setup:
-    For non-UEFI systems
-       /boot/grub/grub.conf   or
-       /boot/grub/menu.lst
-    For UEFI systems
-      /boot/efi/EFI/distroname/grub.conf   or
-      /boot/efi/efi/distroname/elilo.conf
- 2. reboot the sever
- 3. Once the system comes up perform a modprobe -r hpwdt
- 4. modprobe /lib/modules/`uname -r`/kernel/drivers/watchdog/hpwdt.ko
-
- Now, the hpwdt can successfully receive and source the NMI and provide a log
- message that details the reason for the NMI (as determined by the HPE BIOS).
-
- Below is a list of NMIs the HPE BIOS understands along with the associated
- code (reason):
-
-	No source found                00h
-
-	Uncorrectable Memory Error     01h
-
-	ASR NMI                        1Bh
-
-	PCI Parity Error               20h
-
-	NMI Button Press               27h
-
-	SB_BUS_NMI                     28h
-
-	ILO Doorbell NMI               29h
-
-	ILO IOP NMI                    2Ah
-
-	ILO Watchdog NMI               2Bh
-
-	Proc Throt NMI                 2Ch
+ Due to limitations in the iLO hardware, the NMI pretimeout if enabled,
+ can only be set to 9 seconds.  Attempts to set pretimeout to other
+ non-zero values will be rounded, possibly to zero.  Users should verify
+ the pretimeout value after attempting to set pretimeout or timeout.
 
-	Front Side Bus NMI             2Dh
+ Upon receipt of an NMI from the iLO, the hpwdt driver will initiate a
+ panic. This is to allow for a crash dump to be collected.  It is incumbent
+ upon the user to have properly configured the system for kdump.
 
-	PCI Express Error              2Fh
+ The default Linux kernel behavior upon panic is to print a kernel tombstone
+ and loop forever.  This is generally not what a watchdog user wants.
 
-	DMA controller NMI             30h
+ For those wishing to learn more please see:
+	Documentation/kdump/kdump.txt
+	Documentation/admin-guide/kernel-parameters.txt (panic=)
+	Your Linux Distribution specific documentation.
 
-	Hypertransport/CSI Error       31h
+ If the hpwdt does not receive the NMI associated with an expiring timer,
+ the iLO will proceed to reset the system at timeout if the timer hasn't
+ been updated.
 
+--
 
+ The HPE iLO NMI Watchdog Driver and documentation were originally developed
+ by Tom Mingarelli.
 
- -- Tom Mingarelli
diff --git a/Documentation/watchdog/watchdog-parameters.txt b/Documentation/watchdog/watchdog-parameters.txt
index 6d6200ea27b8..0b88e333f9e1 100644
--- a/Documentation/watchdog/watchdog-parameters.txt
+++ b/Documentation/watchdog/watchdog-parameters.txt
@@ -40,6 +40,11 @@ margin: Watchdog margin in seconds (default=60)
 nowayout: Disable watchdog shutdown on close
 	(default=kernel config parameter)
 -------------------------------------------------
+armada_37xx_wdt:
+timeout: Watchdog timeout in seconds. (default=120)
+nowayout: Disable watchdog shutdown on close
+	(default=kernel config parameter)
+-------------------------------------------------
 at91rm9200_wdt:
 wdt_time: Watchdog time in seconds. (default=5)
 nowayout: Watchdog cannot be stopped once started