From: Flavio Suligoi <f.suligoi@asem.it>
Date: Mon, 23 Mar 2026 12:52:04 +0000 (+0100)
Subject: watchdog: gpio_wdt: add ACPI support
X-Git-Url: http://git.ipfire.org/gitweb/index.cgi?a=commitdiff_plain;h=5abb70c8f7582950e490823f4a94a3597ada9d83;p=thirdparty%2Flinux.git

watchdog: gpio_wdt: add ACPI support

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>
---

diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index e19872c0ae61b..8de43b614bb76 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -250,7 +250,7 @@ config DA9062_WATCHDOG
 
 config GPIO_WATCHDOG
 	tristate "Watchdog device controlled through GPIO-line"
-	depends on OF_GPIO
+	depends on (ACPI && GPIOLIB) || OF_GPIO
 	select WATCHDOG_CORE
 	help
 	  If you say yes here you get support for watchdog device