tree 816bde119c06c1ec0836635ba9140f0cbe383dec
parent 35de0c58572b7bc6499b1f6fb6ca1dcdf40cf22f
author Paul Doelle <paaull.git@gmail.com> 1656925225 +0000
committer Stefan Roese <sr@denx.de> 1658383746 +0200

watchdog: add pulse support to gpio watchdog driver

A common external watchdog circuit is kept alive by triggering a short
pulse on the reset pin. This patch adds support for this use case, while
making the algorithm configurable in the devicetree.

The "linux,wdt-gpio" driver being modified is based off the equivalent
driver in the Linux kernel, which provides support for this algorithm.
This patch brings parity to this driver, and is kept aligned with
the functionality and devicetree configuration in the kernel.

It should be noted that this adds a required property named 'hw_algo'
to the devicetree binding, following suit with the kernel. I'm happy to
make this backward-compatible if preferred.

Signed-off-by: Paul Doelle <paaull.git@gmail.com>
Reviewed-by: Stefan Roese <sr@denx.de>