watchdog: gpio_wdt: add ACPI support

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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>

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This commit is contained in:

Flavio Suligoi 2026-03-23 13:52:04 +01:00 • committed by Guenter Roeck

parent d8207d1e9a

commit 5abb70c8f7

1 changed files with 1 additions and 1 deletions

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drivers/watchdog/Kconfig

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