Pull watchdog updates and fixes from Guenter Roeck:
 "Subsystem:
   - Unregister PM notifier on watchdog unregister
   - Various documentation fixes and improvements

  Removed drivers:
   - Remove AMD Elan SC520 processor watchdog driver
   - Drop SMARC-sAM67 support
   - Remove driver for integrated WDT of ZFx86 486-based SoC

  New drivers:
   - Driver for Andes ATCWDT200
   - Driver for Gunyah Watchdog

  Added support to existing drivers:
   - Add "apple,t8103-wdt" and "apple,t8122-wdt" compatibles to Apple
     watchdog driver
   - Add rockchip,rk3528-wdt and rockchip,rv1103b-wdt to snps,dw-wdt.yaml
   - Document IPQ9650, IPQ5210, Shikra, Nord, and Hawi in qcom-wdt.yaml
     Also document sram property and add support to get the bootstatus
     to qcom wdt driver
   - lenovo_se10_wdt: Fix use-after-rfree and add support for SE10 Gen 2
     platform
   - ti,rti-wdt: Add ti,am62l-rti-wdt compatible
   - renesas: Document RZ/G3L support and rework example for
     renesas,r9a09g057-wdt

  Other bug fixes and improvements:
   - Use named initializers (sc1200, ziirave_wdt)
   - Allow pic32-dmt and pic32-wdt to be built with COMPILE_TEST
   - realtek-otto: enable clock before using I/O, and prevent PHASE2 underflows
   - rti_wdt: Add reaction control
   - renesas,rzn1-wdt: Drop interrupt support and other cleanup
   - gpio_wdt: Add ACPI support
   - imx7ulp_wdt: Keep WDOG running until A55 enters WFI on i.MX94
   - sprd_wdt: Remove redundant sprd_wdt_disable() on register failure
   - bcm2835_wdt: Switch to new sys-off handler API
   - sama5d4_wdt: Fix WDDIS detection on SAM9X60 and SAMA7G5
   - hpwdt: Refine hpwdt message for UV platform
   - Convert TS-4800 bindings to DT schema
   - menz069_wdt: drop unneeded MODULE_ALIAS
   - sp5100_tco: Use EFCH MMIO for newer Hygon FCH"

* tag 'watchdog-for-v7.2' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging: (58 commits)
  watchdog: sc1200: Drop unused assignment of pnp_device_id driver data
  watchdog: unregister PM notifier on watchdog unregister
  dt-bindings: watchdog: qcom-wdt: Document IPQ5210 watchdog
  watchdog: dev: convert to kernel-doc comments
  watchdog: core: clean up some comments
  watchdog: uapi: add comments for what bit masks apply to
  watchdog: linux/watchdog.h: repair kernel-doc comments
  watchdog: add devm_watchdog_register_device() to watchdog-kernel-api
  watchdog: ziirave_wdt: Use named initializers for struct i2c_device_id
  watchdog: realtek-otto: enable clock before using I/O
  watchdog: realtek-otto: prevent PHASE2 underflows
  dt-bindings: watchdog: qcom-wdt: Document IPQ9650 watchdog
  dt-bindings: watchdog: renesas,rzn1-wdt: interrupts are not required
  dt-bindings: watchdog: apple,wdt: Add t8122 compatible
  watchdog: apple: Add "apple,t8103-wdt" compatible
  watchdog: rzn1: remove now obsolete interrupt support
  dt-bindings: watchdog: Add watchdog compatible for RK3528
  watchdog: convert the Kconfig dependency on OF_GPIO to OF
  watchdog: Remove AMD Elan SC520 processor watchdog driver
  watchdog: lenovo_se10_wdt: Fix use-after-free and resource leak risk
  ...

OF_GPIO is selected automatically on all OF systems. Any symbols it
controls also provide stubs so there's really no reason to select it
explicitly. We could simply remove the dependency but in order to avoid
a new symbol popping up for everyone in make config - just convert it to
requiring CONFIG_OF.

Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20260506081600.4921-1-bartosz.golaszewski@oss.qualcomm.com
[groeck: Resolved conflict; updated dependencies to require OF _or_ ACPI]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

AMD Elan support was removed from the upstream kernel with commit
8b793a92d862 ("x86/cpu: Remove M486/M486SX/ELAN support"). Its
watchdog driver can no longer be enabled except for test builds.
Remove it.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>

`wdt.rst` is only about the Watchdog from "Industrial Computer Source"
(ICS). Change the title and rename the file to better express this.

Add missing SPDX license identifier `GPL-2.0-or-later` same as code to
silence `checkpatch`.

Fix wrong link to sample driver in drivers/watchdog/smsc37b787_wdt.c.

Signed-off-by: Philipp Hahn <phahn-oss@avm.de>
Link: https://lore.kernel.org/r/5a71979d8e8ab8e0a30de33f6aa2540b3b5dc1ee.1777972790.git.phahn-oss@avm.de
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

Add support for the Andes ATCWDT200 watchdog timer. The driver implements
programmable reset and interrupt timers, and includes automatic detection
of the supported IntTime bit-width.

Integrated with the Linux watchdog framework, it supports basic operations
including start, stop, ping, timeout configuration, and system reset via
the restart handler.

Signed-off-by: CL Wang <cl634@andestech.com>
Link: https://lore.kernel.org/r/20260115081444.2452357-3-cl634@andestech.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

This driver currently only supports builds against a PIC32 target, or
with COMPILE_TEST on MIPS. Now that commit 0f8a61ca78d6 ("watchdog:
pic32-dmt: update include to use pic32.h from platform_data") is merged,
it's possible to compile this driver on other architectures.

To avoid future breakage of this driver in the future, let's update the
Kconfig so that it can be built with COMPILE_TEST enabled on all
architectures.

Signed-off-by: Brian Masney <bmasney@redhat.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20260222-watchdog-pic32-v1-2-a2538aa528d1@redhat.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

This driver currently only supports builds against a PIC32 target, or
with COMPILE_TEST on MIPS. Now that commit 5aa5879eeebb ("watchdog:
pic32-wdt: update include to use pic32.h from platform_data") is merged,
it's possible to compile this driver on other architectures.

To avoid future breakage of this driver in the future, let's update the
Kconfig so that it can be built with COMPILE_TEST enabled on all
architectures.

Signed-off-by: Brian Masney <bmasney@redhat.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20260222-watchdog-pic32-v1-1-a2538aa528d1@redhat.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

This depends on M486 CPU support, which has been removed.

Note that we still keep the RDC321X MFD, watchdog and GPIO
drivers, because apparently there were 586/686 CPUs offered with the
RDC321X, according to Arnd Bergmann:

| "the [RDC321X] product line is still actively developed by RDC
|  and DM&P, and I suspect that some of the drivers are still used
|  on 586tsc-class (vortex86dx, vortex86mx) and 686-class
|  (vortex86dx3, vortex86ex) SoCs that do run modern kernels and
|  get updates."

For this reason, update the watchdog driver and offer it on
the broader 32-bit landscape, which has been COMPILE_TEST=y
build-tested previously already:

  -       depends on X86_RDC321X || COMPILE_TEST
  +       depends on X86_32 || COMPILE_TEST

The MFD and GPIO drivers were already independent of CONFIG_X86_RDC321X.

Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Wim Van Sebroeck <wim@linux-watchdog.org>
Cc: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20250425084216.3913608-6-mingo@kernel.org

On Qualcomm SoCs running under the Gunyah hypervisor, access to watchdog
through MMIO is not available on all platforms. Depending on the
hypervisor configuration, the watchdog is either fully emulated or
exposed via ARM's SMC Calling Conventions (SMCCC) through the Vendor
Specific Hypervisor Service Calls space.

Add driver to support the SMC-based watchdog provided by the Gunyah
Hypervisor. Device registration is done in the QCOM SCM driver after
checks to restrict the watchdog initialization to Qualcomm devices
running under Gunyah.

Gunyah watchdog is not a hardware but an SMC-based vendor-specific
hypervisor interface provided by the Gunyah hypervisor. The design
involving QCOM SCM driver for registering the platform device has been
devised to avoid adding non-hardware nodes to devicetree.

Tested-by: Shivendra Pratap <shivendra.pratap@oss.qualcomm.com>
Tested-by: Neil Armstrong <neil.armstrong@linaro.org>
Tested-by: Mukesh Ojha <mukesh.ojha@oss.qualcomm.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Signed-off-by: Hrishabh Rajput <hrishabh.rajput@oss.qualcomm.com>
Signed-off-by: Pavankumar Kondeti <pavan.kondeti@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20260311-gunyah_watchdog-v8-2-4c1c0689de22@oss.qualcomm.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

The gpio_wdt device driver uses the device property APIs, so it is
firmware agnostic. For this reason we can now add the ACPI support in
Kconfig.
In this way it can be used seamlessly in ACPI and DT systems.

For example, a typical GPIO watchdog device configuration, in an ACPI
SSDT table, could be:

Device (WDOG) {
    Name (_HID, "WDOG0001")
    Name (_CID, "PRP0001")
    Name (_UID, One)
    Name (_CRS, ResourceTemplate () {
        GpioIo (Exclusive, PullNone, 0, 0, IoRestrictionOutputOnly,
                "\\_SB.GPI0", 0, ResourceConsumer, ,) { 3 }
    })
    Method (_STA, 0, NotSerialized) {
        Return (0x0F)
    }
    Name (_DSD, Package (2)
    {
        ToUUID ("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
        Package (5)
        {
            Package () { "compatible", Package() { "linux,wdt-gpio" } },
            Package () { "hw_algo", "toggle" },
            Package () { "gpios", Package () { ^WDOG, 0, 0, 0 } },
            Package () { "hw_margin_ms", 2000 },
            Package () { "always-running", 1 },
        },
    })
}

Signed-off-by: Flavio Suligoi <f.suligoi@asem.it>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20260323125204.164785-2-f.suligoi@asem.it
Signed-off-by: Guenter Roeck <linux@roeck-us.net>