The following patches are needed to add support for the hardware watchdog found in most sunxi SoC's.
The patches below have only been tested on a sun50i device (H5 SoC) and work as expected. The actual sunxi_wdt.c was roughly based off of the mainline linux driver, and is enabled by adding CONFIG_SUNXI_WDT to your config. It is not enabled by default.
Chris Blake (2): watchdog: Fix SPL builds when watchdog is enabled watchdog: Add sunxi watchdog driver
common/board_f.c | 3 +- drivers/watchdog/Kconfig | 18 ++++++++ drivers/watchdog/Makefile | 1 + drivers/watchdog/sunxi_wdt.c | 103 +++++++++++++++++++++++++++++++++++++++++++ include/watchdog.h | 4 +- 5 files changed, 126 insertions(+), 3 deletions(-) create mode 100644 drivers/watchdog/sunxi_wdt.c