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7f3d53c8bf
Back when I added this driver in commit 2ac8490412c9, I wrote
The corresponding linux driver apparently has support for some
watchdog circuits which can be disabled by tri-stating the gpio, but I
have never actually encountered such a chip in the wild;
That has changed now; I have a board with just such a watchdog on my
desk currently. Add support for that.
- For a hw_algo="toggle" device, the gpio is requested as output if the
always-running flag is set, otherwise as input.
- The ->start() method is updated to change the direction to output when
required (i.e. it is not always-running).
- The ->stop() method is implemented, but of course reports failure if
always-running.
As I still haven't met any hw_algo="level" devices, I'm not entirely
sure how they fit in, but I'm borrowing logic from the corresponding
linux driver:
- In ->probe(), such devices always request the gpio as GPIOD_IS_OUT.
- In ->stop(), the linux driver has an "eternal ping" comment and sets
the gpio to (logic) high.
Stefan:
Added necessary changes in test/dm/wdt.c to fix CI build breakage, as
suggested by Rasmus.
Signed-off-by: Rasmus Villemoes <ravi@prevas.dk>
Reviewed-by: Stefan Roese <sr@denx.de>