Merge git://www.linux-watchdog.org/linux-watchdog

6606b342 · Linus Torvalds <[email protected]> · 2016-01-17 12:15:38 -08:00

Pull watchdog updates from Wim Van Sebroeck:
 "This adds following items:

   - watchdog restart handler support
   - watchdog reboot notifier support
   - watchdog sysfs attributes
   - support for the following new devices: AMD Mullins platform, AMD
     Carrizo platform, meson8b SoC, CSRatlas7, TS-4800, Alphascale
     asm9260-wdt, Zodiac, Sigma Designs SMP86xx/SMP87xx
   - Changes in refcounting for the watchdog core
   - watchdog core improvements
   - and small fixes"

* git://www.linux-watchdog.org/linux-watchdog: (60 commits)
  watchdog: asm9260: remove __init and __exit annotations
  watchdog: Drop pointer to watchdog device from struct watchdog_device
  watchdog: ziirave: Use watchdog infrastructure to create sysfs attributes
  watchdog: Add support for creating driver specific sysfs attributes
  watchdog: kill unref/ref ops
  watchdog: stmp3xxx: Remove unused variables
  watchdog: add MT7621 watchdog support
  hwmon: (sch56xx) Drop watchdog driver data reference count callbacks
  watchdog: da9055_wdt: Drop reference counting
  watchdog: da9052_wdt: Drop reference counting
  watchdog: Separate and maintain variables based on variable lifetime
  watchdog: diag288: Stop re-using watchdog core internal flags
  watchdog: Create watchdog device in watchdog_dev.c
  watchdog: qcom-wdt: Do not set 'dev' in struct watchdog_device
  watchdog: mena21: Do not use device pointer from struct watchdog_device
  watchdog: gpio: Do not use device pointer from struct watchdog_device
  watchdog: tangox: Print info message using pointer to platform device
  watchdog: bcm2835_wdt: Drop log message if watchdog is stopped
  devicetree: watchdog: add binding for Sigma Designs SMP8642 watchdog
  watchdog: add support for Sigma Designs SMP86xx/SMP87xx
  ...

Commit: 6606b342febfd470b4a33acb73e360eeaca1d9bb
Parents: a016af2e · ac36856f

Merge commit. Changes below are compared with the first parent: a016af2e.

Changes

48 files changed · +2671 −815

File	Status	Add	Del	Content
Documentation/ABI/testing/sysfs-class-watchdog	added	+51	−0	View file
Documentation/devicetree/bindings/watchdog/alphascale-asm9260.txt	added	+35	−0	View file
Documentation/devicetree/bindings/watchdog/mt7621-wdt.txt	added	+12	−0	View file
Documentation/devicetree/bindings/watchdog/sigma,smp8642-wdt.txt	added	+18	−0	View file
Documentation/devicetree/bindings/watchdog/ts4800-wdt.txt	added	+25	−0	View file
Documentation/devicetree/bindings/watchdog/ziirave-wdt.txt	added	+19	−0	View file
Documentation/watchdog/watchdog-kernel-api.txt	modified	+37	−40	View file
MAINTAINERS	modified	+1	−0	View file
drivers/hwmon/sch56xx-common.c	modified	+1	−30	View file
drivers/watchdog/Kconfig	modified	+65	−0	View file
drivers/watchdog/Makefile	modified	+6	−0	View file
drivers/watchdog/asm9260_wdt.c	added	+403	−0	View file
drivers/watchdog/atlas7_wdt.c	added	+242	−0	View file
drivers/watchdog/bcm2835_wdt.c	modified	+0	−1	View file
drivers/watchdog/bcm47xx_wdt.c	modified	+14	−41	View file
drivers/watchdog/cadence_wdt.c	modified	+3	−39	View file
drivers/watchdog/da9052_wdt.c	modified	+0	−24	View file
drivers/watchdog/da9055_wdt.c	modified	+0	−24	View file
drivers/watchdog/da9063_wdt.c	modified	+6	−17	View file
drivers/watchdog/diag288_wdt.c	modified	+16	−10	View file
drivers/watchdog/digicolor_wdt.c	modified	+5	−13	View file
drivers/watchdog/dw_wdt.c	modified	+1	−1	View file
drivers/watchdog/gpio_wdt.c	modified	+4	−34	View file
drivers/watchdog/hpwdt.c	modified	+6	−6	View file
drivers/watchdog/imgpdc_wdt.c	modified	+12	−22	View file
drivers/watchdog/imx2_wdt.c	modified	+6	−17	View file
drivers/watchdog/lpc18xx_wdt.c	modified	+21	−31	View file
drivers/watchdog/mena21_wdt.c	modified	+2	−2	View file
drivers/watchdog/meson_wdt.c	modified	+53	−35	View file
drivers/watchdog/moxart_wdt.c	modified	+6	−17	View file
drivers/watchdog/mt7621_wdt.c	added	+186	−0	View file
drivers/watchdog/mtk_wdt.c	modified	+5	−17	View file
drivers/watchdog/omap_wdt.c	modified	+4	−3	View file
drivers/watchdog/qcom-wdt.c	modified	+19	−31	View file
drivers/watchdog/s3c2410_wdt.c	modified	+25	−35	View file
drivers/watchdog/softdog.c	modified	+8	−30	View file
drivers/watchdog/sp5100_tco.c	modified	+20	−12	View file
drivers/watchdog/stmp3xxx_rtc_wdt.c	modified	+25	−0	View file
drivers/watchdog/sunxi_wdt.c	modified	+5	−18	View file
drivers/watchdog/tangox_wdt.c	added	+225	−0	View file
drivers/watchdog/ts4800_wdt.c	added	+215	−0	View file
drivers/watchdog/w83627hf_wdt.c	modified	+2	−30	View file
drivers/watchdog/watchdog_core.c	modified	+84	−31	View file
drivers/watchdog/watchdog_core.h	modified	+1	−1	View file
drivers/watchdog/watchdog_dev.c	modified	+387	−185	View file
drivers/watchdog/ziirave_wdt.c	added	+367	−0	View file
include/linux/bcm47xx_wdt.h	modified	+0	−3	View file
include/linux/watchdog.h	modified	+23	−15	View file

Only the first 600 diff lines are shown. Download the complete patch.

Documentation/ABI/testing/sysfs-class-watchdog

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diff --git a/Documentation/ABI/testing/sysfs-class-watchdog b/Documentation/ABI/testing/sysfs-class-watchdog
new file mode 100644
index 0000000..736046b
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-class-watchdog
@@ -0,0 +1,51 @@
+What:		/sys/class/watchdog/watchdogn/bootstatus
+Date:		August 2015
+Contact:	Wim Van Sebroeck <[email protected]>
+Description:
+		It is a read only file. It contains status of the watchdog
+		device at boot. It is equivalent to WDIOC_GETBOOTSTATUS of
+		ioctl interface.
+
+What:		/sys/class/watchdog/watchdogn/identity
+Date:		August 2015
+Contact:	Wim Van Sebroeck <[email protected]>
+Description:
+		It is a read only file. It contains identity string of
+		watchdog device.
+
+What:		/sys/class/watchdog/watchdogn/nowayout
+Date:		August 2015
+Contact:	Wim Van Sebroeck <[email protected]>
+Description:
+		It is a read only file. While reading, it gives '1' if that
+		device supports nowayout feature else, it gives '0'.
+
+What:		/sys/class/watchdog/watchdogn/state
+Date:		August 2015
+Contact:	Wim Van Sebroeck <[email protected]>
+Description:
+		It is a read only file. It gives active/inactive status of
+		watchdog device.
+
+What:		/sys/class/watchdog/watchdogn/status
+Date:		August 2015
+Contact:	Wim Van Sebroeck <[email protected]>
+Description:
+		It is a read only file. It contains watchdog device's
+		internal status bits. It is equivalent to WDIOC_GETSTATUS
+		of ioctl interface.
+
+What:		/sys/class/watchdog/watchdogn/timeleft
+Date:		August 2015
+Contact:	Wim Van Sebroeck <[email protected]>
+Description:
+		It is a read only file. It contains value of time left for
+		reset generation. It is equivalent to WDIOC_GETTIMELEFT of
+		ioctl interface.
+
+What:		/sys/class/watchdog/watchdogn/timeout
+Date:		August 2015
+Contact:	Wim Van Sebroeck <[email protected]>
+Description:
+		It is a read only file. It is read to know about current
+		value of timeout programmed.

Documentation/devicetree/bindings/watchdog/alphascale-asm9260.txt

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diff --git a/Documentation/devicetree/bindings/watchdog/alphascale-asm9260.txt b/Documentation/devicetree/bindings/watchdog/alphascale-asm9260.txt
new file mode 100644
index 0000000..75b265a
--- /dev/null
+++ b/Documentation/devicetree/bindings/watchdog/alphascale-asm9260.txt
@@ -0,0 +1,35 @@
+Alphascale asm9260 Watchdog timer
+
+Required properties:
+
+- compatible : should be "alphascale,asm9260-wdt".
+- reg : Specifies base physical address and size of the registers.
+- clocks : the clocks feeding the watchdog timer. See clock-bindings.txt
+- clock-names : should be set to
+	"mod" - source for tick counter.
+	"ahb" - ahb gate.
+- resets : phandle pointing to the system reset controller with
+	line index for the watchdog.
+- reset-names : should be set to "wdt_rst".
+
+Optional properties:
+- timeout-sec : shall contain the default watchdog timeout in seconds,
+	if unset, the default timeout is 30 seconds.
+- alphascale,mode : three modes are supported
+	"hw" - hw reset (default).
+	"sw" - sw reset.
+	"debug" - no action is taken.
+
+Example:
+
+watchdog0: watchdog@80048000 {
+	compatible = "alphascale,asm9260-wdt";
+	reg = <0x80048000 0x10>;
+	clocks = <&acc CLKID_SYS_WDT>, <&acc CLKID_AHB_WDT>;
+	clock-names = "mod", "ahb";
+	interrupts = <55>;
+	resets = <&rst WDT_RESET>;
+	reset-names = "wdt_rst";
+	timeout-sec = <30>;
+	alphascale,mode = "hw";
+};

Documentation/devicetree/bindings/watchdog/mt7621-wdt.txt

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diff --git a/Documentation/devicetree/bindings/watchdog/mt7621-wdt.txt b/Documentation/devicetree/bindings/watchdog/mt7621-wdt.txt
new file mode 100644
index 0000000..c15ef0e
--- /dev/null
+++ b/Documentation/devicetree/bindings/watchdog/mt7621-wdt.txt
@@ -0,0 +1,12 @@
+Ralink Watchdog Timers
+
+Required properties:
+- compatible: must be "mediatek,mt7621-wdt"
+- reg: physical base address of the controller and length of the register range
+
+Example:
+
+	watchdog@100 {
+		compatible = "mediatek,mt7621-wdt";
+		reg = <0x100 0x10>;
+	};

Documentation/devicetree/bindings/watchdog/sigma,smp8642-wdt.txt

View file

diff --git a/Documentation/devicetree/bindings/watchdog/sigma,smp8642-wdt.txt b/Documentation/devicetree/bindings/watchdog/sigma,smp8642-wdt.txt
new file mode 100644
index 0000000..5b7ec2c
--- /dev/null
+++ b/Documentation/devicetree/bindings/watchdog/sigma,smp8642-wdt.txt
@@ -0,0 +1,18 @@
+Sigma Designs SMP86xx/SMP87xx watchdog
+
+Required properties:
+- compatible: Should be "sigma,smp8642-wdt"
+- reg: Specifies the physical address region
+- clocks: Should be a phandle to the clock
+
+Optional properties:
+- timeout-sec: watchdog timeout in seconds
+
+Example:
+
+watchdog@1fd00 {
+	compatible = "sigma,smp8642-wdt";
+	reg = <0x1fd00 8>;
+	clocks = <&xtal_in_clk>;
+	timeout-sec = <30>;
+};

Documentation/devicetree/bindings/watchdog/ts4800-wdt.txt

View file

diff --git a/Documentation/devicetree/bindings/watchdog/ts4800-wdt.txt b/Documentation/devicetree/bindings/watchdog/ts4800-wdt.txt
new file mode 100644
index 0000000..8f6caad
--- /dev/null
+++ b/Documentation/devicetree/bindings/watchdog/ts4800-wdt.txt
@@ -0,0 +1,25 @@
+Technologic Systems Watchdog
+
+Required properties:
+- compatible: must be "technologic,ts4800-wdt"
+- syscon: phandle / integer array that points to the syscon node which
+          describes the FPGA's syscon registers.
+          - phandle to FPGA's syscon
+          - offset to the watchdog register
+
+Optional property:
+- timeout-sec: contains the watchdog timeout in seconds.
+
+Example:
+
+syscon: syscon@b0010000 {
+	compatible = "syscon", "simple-mfd";
+	reg = <0xb0010000 0x3d>;
+	reg-io-width = <2>;
+
+	wdt@e {
+		compatible = "technologic,ts4800-wdt";
+		syscon = <&syscon 0xe>;
+		timeout-sec = <10>;
+	};
+}

Documentation/devicetree/bindings/watchdog/ziirave-wdt.txt

View file

diff --git a/Documentation/devicetree/bindings/watchdog/ziirave-wdt.txt b/Documentation/devicetree/bindings/watchdog/ziirave-wdt.txt
new file mode 100644
index 0000000..3d87818
--- /dev/null
+++ b/Documentation/devicetree/bindings/watchdog/ziirave-wdt.txt
@@ -0,0 +1,19 @@
+Zodiac RAVE Watchdog Timer
+
+Required properties:
+- compatible: must be "zii,rave-wdt"
+- reg: i2c slave address of device, usually 0x38
+
+Optional Properties:
+- timeout-sec: Watchdog timeout value in seconds.
+- reset-duration-ms: Duration of the pulse generated when the watchdog times
+  out. Value in milliseconds.
+
+Example:
+
+	watchdog@38 {
+		compatible = "zii,rave-wdt";
+		reg = <0x38>;
+		timeout-sec = <30>;
+		reset-duration-ms = <30>;
+	};

Documentation/watchdog/watchdog-kernel-api.txt

View file

diff --git a/Documentation/watchdog/watchdog-kernel-api.txt b/Documentation/watchdog/watchdog-kernel-api.txt
index d8b0d33..55120a0 100644
--- a/Documentation/watchdog/watchdog-kernel-api.txt
+++ b/Documentation/watchdog/watchdog-kernel-api.txt
@@ -44,17 +44,18 @@ The watchdog device structure looks like this:
 
 struct watchdog_device {
 	int id;
-	struct cdev cdev;
-	struct device *dev;
 	struct device *parent;
+	const struct attribute_group **groups;
 	const struct watchdog_info *info;
 	const struct watchdog_ops *ops;
 	unsigned int bootstatus;
 	unsigned int timeout;
 	unsigned int min_timeout;
 	unsigned int max_timeout;
+	struct notifier_block reboot_nb;
+	struct notifier_block restart_nb;
 	void *driver_data;
-	struct mutex lock;
+	struct watchdog_core_data *wd_data;
 	unsigned long status;
 	struct list_head deferred;
 };
@@ -64,27 +65,32 @@ It contains following fields:
   /dev/watchdog0 cdev (dynamic major, minor 0) as well as the old
   /dev/watchdog miscdev. The id is set automatically when calling
   watchdog_register_device.
-* cdev: cdev for the dynamic /dev/watchdog<id> device nodes. This
-  field is also populated by watchdog_register_device.
-* dev: device under the watchdog class (created by watchdog_register_device).
 * parent: set this to the parent device (or NULL) before calling
   watchdog_register_device.
+* groups: List of sysfs attribute groups to create when creating the watchdog
+  device.
 * info: a pointer to a watchdog_info structure. This structure gives some
   additional information about the watchdog timer itself. (Like it's unique name)
 * ops: a pointer to the list of watchdog operations that the watchdog supports.
 * timeout: the watchdog timer's timeout value (in seconds).
 * min_timeout: the watchdog timer's minimum timeout value (in seconds).
 * max_timeout: the watchdog timer's maximum timeout value (in seconds).
+* reboot_nb: notifier block that is registered for reboot notifications, for
+  internal use only. If the driver calls watchdog_stop_on_reboot, watchdog core
+  will stop the watchdog on such notifications.
+* restart_nb: notifier block that is registered for machine restart, for
+  internal use only. If a watchdog is capable of restarting the machine, it
+  should define ops->restart. Priority can be changed through
+  watchdog_set_restart_priority.
 * bootstatus: status of the device after booting (reported with watchdog
   WDIOF_* status bits).
 * driver_data: a pointer to the drivers private data of a watchdog device.
   This data should only be accessed via the watchdog_set_drvdata and
   watchdog_get_drvdata routines.
-* lock: Mutex for WatchDog Timer Driver Core internal use only.
+* wd_data: a pointer to watchdog core internal data.
 * status: this field contains a number of status bits that give extra
   information about the status of the device (Like: is the watchdog timer
-  running/active, is the nowayout bit set, is the device opened via
-  the /dev/watchdog interface or not, ...).
+  running/active, or is the nowayout bit set).
 * deferred: entry in wtd_deferred_reg_list which is used to
   register early initialized watchdogs.
 
@@ -100,8 +106,9 @@ struct watchdog_ops {
 	unsigned int (*status)(struct watchdog_device *);
 	int (*set_timeout)(struct watchdog_device *, unsigned int);
 	unsigned int (*get_timeleft)(struct watchdog_device *);
-	void (*ref)(struct watchdog_device *);
-	void (*unref)(struct watchdog_device *);
+	int (*restart)(struct watchdog_device *);
+	void (*ref)(struct watchdog_device *) __deprecated;
+	void (*unref)(struct watchdog_device *) __deprecated;
 	long (*ioctl)(struct watchdog_device *, unsigned int, unsigned long);
 };
 
@@ -110,20 +117,6 @@ driver's operations. This module owner will be used to lock the module when
 the watchdog is active. (This to avoid a system crash when you unload the
 module and /dev/watchdog is still open).
 
-If the watchdog_device struct is dynamically allocated, just locking the module
-is not enough and a driver also needs to define the ref and unref operations to
-ensure the structure holding the watchdog_device does not go away.
-
-The simplest (and usually sufficient) implementation of this is to:
-1) Add a kref struct to the same structure which is holding the watchdog_device
-2) Define a release callback for the kref which frees the struct holding both
-3) Call kref_init on this kref *before* calling watchdog_register_device()
-4) Define a ref operation calling kref_get on this kref
-5) Define a unref operation calling kref_put on this kref
-6) When it is time to cleanup:
- * Do not kfree() the struct holding both, the last kref_put will do this!
- * *After* calling watchdog_unregister_device() call kref_put on the kref
-
 Some operations are mandatory and some are optional. The mandatory operations
 are:
 * start: this is a pointer to the routine that starts the watchdog timer
@@ -164,34 +157,23 @@ they are supported. These optional routines/operations are:
   (Note: the WDIOF_SETTIMEOUT needs to be set in the options field of the
   watchdog's info structure).
 * get_timeleft: this routines returns the time that's left before a reset.
-* ref: the operation that calls kref_get on the kref of a dynamically
-  allocated watchdog_device struct.
-* unref: the operation that calls kref_put on the kref of a dynamically
-  allocated watchdog_device struct.
+* restart: this routine restarts the machine. It returns 0 on success or a
+  negative errno code for failure.
 * ioctl: if this routine is present then it will be called first before we do
   our own internal ioctl call handling. This routine should return -ENOIOCTLCMD
   if a command is not supported. The parameters that are passed to the ioctl
   call are: watchdog_device, cmd and arg.
 
+The 'ref' and 'unref' operations are no longer used and deprecated.
+
 The status bits should (preferably) be set with the set_bit and clear_bit alike
 bit-operations. The status bits that are defined are:
 * WDOG_ACTIVE: this status bit indicates whether or not a watchdog timer device
   is active or not. When the watchdog is active after booting, then you should
   set this status bit (Note: when you register the watchdog timer device with
   this bit set, then opening /dev/watchdog will skip the start operation)
-* WDOG_DEV_OPEN: this status bit shows whether or not the watchdog device
-  was opened via /dev/watchdog.
-  (This bit should only be used by the WatchDog Timer Driver Core).
-* WDOG_ALLOW_RELEASE: this bit stores whether or not the magic close character
-  has been sent (so that we can support the magic close feature).
-  (This bit should only be used by the WatchDog Timer Driver Core).
 * WDOG_NO_WAY_OUT: this bit stores the nowayout setting for the watchdog.
   If this bit is set then the watchdog timer will not be able to stop.
-* WDOG_UNREGISTERED: this bit gets set by the WatchDog Timer Driver Core
-  after calling watchdog_unregister_device, and then checked before calling
-  any watchdog_ops, so that you can be sure that no operations (other then
-  unref) will get called after unregister, even if userspace still holds a
-  reference to /dev/watchdog
 
   To set the WDOG_NO_WAY_OUT status bit (before registering your watchdog
   timer device) you can either:
@@ -231,3 +213,18 @@ the device tree (if the module timeout parameter is invalid). Best practice is
 to set the default timeout value as timeout value in the watchdog_device and
 then use this function to set the user "preferred" timeout value.
 This routine returns zero on success and a negative errno code for failure.
+
+To disable the watchdog on reboot, the user must call the following helper:
+
+static inline void watchdog_stop_on_reboot(struct watchdog_device *wdd);
+
+To change the priority of the restart handler the following helper should be
+used:
+
+void watchdog_set_restart_priority(struct watchdog_device *wdd, int priority);
+
+User should follow the following guidelines for setting the priority:
+* 0: should be called in last resort, has limited restart capabilities
+* 128: default restart handler, use if no other handler is expected to be
+  available, and/or if restart is sufficient to restart the entire system
+* 255: highest priority, will preempt all other restart handlers

MAINTAINERS

View file

diff --git a/MAINTAINERS b/MAINTAINERS
index 04d62b1..11073db 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -11676,6 +11676,7 @@ F:	drivers/input/tablet/wacom_serial4.c
 
 WATCHDOG DEVICE DRIVERS
 M:	Wim Van Sebroeck <[email protected]>
+R:	Guenter Roeck <[email protected]>
 L:	[email protected]
 W:	http://www.linux-watchdog.org/
 T:	git git://www.linux-watchdog.org/linux-watchdog.git

drivers/hwmon/sch56xx-common.c

View file

diff --git a/drivers/hwmon/sch56xx-common.c b/drivers/hwmon/sch56xx-common.c
index 7386819..68c350c 100644
--- a/drivers/hwmon/sch56xx-common.c
+++ b/drivers/hwmon/sch56xx-common.c
@@ -30,7 +30,6 @@
 #include <linux/watchdog.h>
 #include <linux/miscdevice.h>
 #include <linux/uaccess.h>
-#include <linux/kref.h>
 #include <linux/slab.h>
 #include "sch56xx-common.h"
 
@@ -67,7 +66,6 @@ MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
 struct sch56xx_watchdog_data {
 	u16 addr;
 	struct mutex *io_lock;
-	struct kref kref;
 	struct watchdog_info wdinfo;
 	struct watchdog_device wddev;
 	u8 watchdog_preset;
@@ -258,15 +256,6 @@ EXPORT_SYMBOL(sch56xx_read_virtual_reg12);
  * Watchdog routines
  */
 
-/* Release our data struct when we're unregistered *and*
-   all references to our watchdog device are released */
-static void watchdog_release_resources(struct kref *r)
-{
-	struct sch56xx_watchdog_data *data =
-		container_of(r, struct sch56xx_watchdog_data, kref);
-	kfree(data);
-}
-
 static int watchdog_set_timeout(struct watchdog_device *wddev,
 				unsigned int timeout)
 {
@@ -395,28 +384,12 @@ static int watchdog_stop(struct watchdog_device *wddev)
 	return 0;
 }
 
-static void watchdog_ref(struct watchdog_device *wddev)
-{
-	struct sch56xx_watchdog_data *data = watchdog_get_drvdata(wddev);
-
-	kref_get(&data->kref);
-}
-
-static void watchdog_unref(struct watchdog_device *wddev)
-{
-	struct sch56xx_watchdog_data *data = watchdog_get_drvdata(wddev);
-
-	kref_put(&data->kref, watchdog_release_resources);
-}
-
 static const struct watchdog_ops watchdog_ops = {
 	.owner		= THIS_MODULE,
 	.start		= watchdog_start,
 	.stop		= watchdog_stop,
 	.ping		= watchdog_trigger,
 	.set_timeout	= watchdog_set_timeout,
-	.ref		= watchdog_ref,
-	.unref		= watchdog_unref,
 };
 
 struct sch56xx_watchdog_data *sch56xx_watchdog_register(struct device *parent,
@@ -448,7 +421,6 @@ struct sch56xx_watchdog_data *sch56xx_watchdog_register(struct device *parent,
 
 	data->addr = addr;
 	data->io_lock = io_lock;
-	kref_init(&data->kref);
 
 	strlcpy(data->wdinfo.identity, "sch56xx watchdog",
 		sizeof(data->wdinfo.identity));
@@ -494,8 +466,7 @@ EXPORT_SYMBOL(sch56xx_watchdog_register);
 void sch56xx_watchdog_unregister(struct sch56xx_watchdog_data *data)
 {
 	watchdog_unregister_device(&data->wddev);
-	kref_put(&data->kref, watchdog_release_resources);
-	/* Don't touch data after this it may have been free-ed! */
+	kfree(data);
 }
 EXPORT_SYMBOL(sch56xx_watchdog_unregister);
 

drivers/watchdog/Kconfig

View file

diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index 1c427be..4f0e7be 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -46,6 +46,13 @@ config WATCHDOG_NOWAYOUT
 	  get killed. If you say Y here, the watchdog cannot be stopped once
 	  it has been started.
 
+config WATCHDOG_SYSFS
+	bool "Read different watchdog information through sysfs"
+	default n
+	help
+	  Say Y here if you want to enable watchdog device status read through
+	  sysfs attributes.
+
 #
 # General Watchdog drivers
 #
@@ -135,6 +142,16 @@ config MENF21BMC_WATCHDOG
 	  This driver can also be built as a module. If so the module
 	  will be called menf21bmc_wdt.
 
+config TANGOX_WATCHDOG
+	tristate "Sigma Designs SMP86xx/SMP87xx watchdog"
+	select WATCHDOG_CORE
+	depends on ARCH_TANGOX || COMPILE_TEST
+	help
+	  Support for the watchdog in Sigma Designs SMP86xx (tango3)
+	  and SMP87xx (tango4) family chips.
+
+	  This driver can be built as a module. The module name is tangox_wdt.
+
 config WM831X_WATCHDOG
 	tristate "WM831x watchdog"
 	depends on MFD_WM831X
@@ -161,6 +178,17 @@ config XILINX_WATCHDOG
 	  To compile this driver as a module, choose M here: the
 	  module will be called of_xilinx_wdt.
 
+config ZIIRAVE_WATCHDOG
+	tristate "Zodiac RAVE Watchdog Timer"
+	depends on I2C
+	select WATCHDOG_CORE
+	help
+	  Watchdog driver for the Zodiac Aerospace RAVE Switch Watchdog
+	  Processor.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called ziirave_wdt.
+
 # ALPHA Architecture
 
 # ARM Architecture
@@ -173,6 +201,16 @@ config ARM_SP805_WATCHDOG
 	  ARM Primecell SP805 Watchdog timer. This will reboot your system when
 	  the timeout is reached.
 
+config ASM9260_WATCHDOG
+	tristate "Alphascale ASM9260 watchdog"
+	depends on MACH_ASM9260
+	depends on OF
+	select WATCHDOG_CORE
+	select RESET_CONTROLLER
+	help
+	  Watchdog timer embedded into Alphascale asm9260 chips. This will reboot your
+	  system when the timeout is reached.
+
 config AT91RM9200_WATCHDOG
 	tristate "AT91RM9200 watchdog"
 	depends on SOC_AT91RM9200 && MFD_SYSCON
@@ -426,6 +464,16 @@ config NUC900_WATCHDOG
 	  To compile this driver as a module, choose M here: the
 	  module will be called nuc900_wdt.
 
+config TS4800_WATCHDOG
+	tristate "TS-4800 Watchdog"
+	depends on HAS_IOMEM && OF
+	select WATCHDOG_CORE
+	select MFD_SYSCON
+	help
+	  Technologic Systems TS-4800 has watchdog timer implemented in
+	  an external FPGA. Say Y here if you want to support for the
+	  watchdog timer on TS-4800 board.
+
 config TS72XX_WATCHDOG
 	tristate "TS-72XX SBC Watchdog"
 	depends on MACH_TS72XX
@@ -578,6 +626,16 @@ config LPC18XX_WATCHDOG
 	  To compile this driver as a module, choose M here: the
 	  module will be called lpc18xx_wdt.
 
+config ATLAS7_WATCHDOG
+	tristate "CSRatlas7 watchdog"
+	depends on ARCH_ATLAS7
+	help
+	  Say Y here to include Watchdog timer support for the watchdog
+	  existing on the CSRatlas7 series platforms.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called atlas7_wdt.
+
 # AVR32 Architecture
 
 config AT32AP700X_WDT
@@ -1345,6 +1403,13 @@ config RALINK_WDT
 	help
 	  Hardware driver for the Ralink SoC Watchdog Timer.
 
+config MT7621_WDT
+	tristate "Mediatek SoC watchdog"
+	select WATCHDOG_CORE
+	depends on SOC_MT7620 || SOC_MT7621
+	help
+	  Hardware driver for the Mediatek/Ralink MT7621/8 SoC Watchdog Timer.
+
 # PARISC Architecture
 
 # POWERPC Architecture

drivers/watchdog/Makefile

View file

diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
index 53d4827..f566753 100644
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -30,6 +30,7 @@ obj-$(CONFIG_USBPCWATCHDOG) += pcwd_usb.o
 
 # ARM Architecture
 obj-$(CONFIG_ARM_SP805_WATCHDOG) += sp805_wdt.o
+obj-$(CONFIG_ASM9260_WATCHDOG) += asm9260_wdt.o
 obj-$(CONFIG_AT91RM9200_WATCHDOG) += at91rm9200_wdt.o
 obj-$(CONFIG_AT91SAM9X_WATCHDOG) += at91sam9_wdt.o
 obj-$(CONFIG_CADENCE_WATCHDOG) += cadence_wdt.o
@@ -53,6 +54,7 @@ obj-$(CONFIG_RN5T618_WATCHDOG) += rn5t618_wdt.o
 obj-$(CONFIG_COH901327_WATCHDOG) += coh901327_wdt.o
 obj-$(CONFIG_STMP3XXX_RTC_WATCHDOG) += stmp3xxx_rtc_wdt.o
 obj-$(CONFIG_NUC900_WATCHDOG) += nuc900_wdt.o
+obj-$(CONFIG_TS4800_WATCHDOG) += ts4800_wdt.o
 obj-$(CONFIG_TS72XX_WATCHDOG) += ts72xx_wdt.o
 obj-$(CONFIG_IMX2_WDT) += imx2_wdt.o
 obj-$(CONFIG_UX500_WATCHDOG) += ux500_wdt.o
@@ -69,6 +71,7 @@ obj-$(CONFIG_MEDIATEK_WATCHDOG) += mtk_wdt.o
 obj-$(CONFIG_DIGICOLOR_WATCHDOG) += digicolor_wdt.o
 obj-$(CONFIG_LPC18XX_WATCHDOG) += lpc18xx_wdt.o
 obj-$(CONFIG_BCM7038_WDT) += bcm7038_wdt.o
+obj-$(CONFIG_ATLAS7_WATCHDOG) += atlas7_wdt.o
 
 # AVR32 Architecture
 obj-$(CONFIG_AT32AP700X_WDT) += at32ap700x_wdt.o
@@ -149,6 +152,7 @@ octeon-wdt-y := octeon-wdt-main.o octeon-wdt-nmi.o
 obj-$(CONFIG_LANTIQ_WDT) += lantiq_wdt.o
 obj-$(CONFIG_RALINK_WDT) += rt2880_wdt.o
 obj-$(CONFIG_IMGPDC_WDT) += imgpdc_wdt.o
+obj-$(CONFIG_MT7621_WDT) += mt7621_wdt.o
 
 # PARISC Architecture