[PATCHv2 0/2] watchdog: ath79: modernize and broaden build coverage

[Rosen Penev <rosenp@gmail.com>]

Patch 1 splits OF out as a hard dependency (the driver has always been
OF-only) and broadens COMPILE_TEST coverage from ARM to all
architectures, so the driver can be built on non-MIPS targets.

Patch 2 moves the driver off the legacy miscdevice/file_operations
interface to the watchdog_device framework.  This drops ~100 lines of
hand-rolled ioctl, open/release, and busy/expect-close bookkeeping in
favor of framework callbacks, fixes get_timeleft() to return seconds
instead of raw clock ticks, and properly propagates -EPROBE_DEFER from
clk_get().  nowayout, the timeout module parameter, and module .owner
are wired through the standard helpers.

Tested on an Archer C7v2; sysupgrade watchdog handoff still works.

v2: addressed review comments

Rosen Penev (2):
  watchdog: ath79_wdt: select OF and COMPILE_TEST
  watchdog: ath79: convert to watchdog_device

 drivers/watchdog/Kconfig     |   3 +-
 drivers/watchdog/ath79_wdt.c | 250 +++++++++++------------------------
 2 files changed, 77 insertions(+), 176 deletions(-)

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2.54.0