[Linux-stm32] [RFC PATCH 0/3] watchdog: arm_smc_wdt: allow a list of SMC function ids

[Julius Werner]

> DT folks, is there a way to keep the list in arm,smc-id that you would
> be fine with?

Perhaps this is a bit of a hack, but you're in an unintended situation
that wasn't supposed to happen to begin with so I feel it might be
appropriate if it avoids adding a whole new mechanism to the driver:
What happens if you simply define two watchdog nodes in your DTS, one
for each SMC ID? Both of them would independently try to probe, one of
them would die from getting an SMC_UNK, and the other would continue
working to pet your watchdog?

This driver started as encoding the SMC ID in the DTS and that kinda
seems to be the standard for drivers interacting with non-standard
SMCs, so I would prefer to stick to that rather than hardcoding IDs in
the C source (if we do that for each board it may end up being a long
list eventually — I think one of the reasons the device tree was
originally adopted was to avoid things like that). I would be fine
with the array solution but I don't know about the validation checker
and whether people care about reusing the same prop name with
different types. (FWIW, in the device tree a 32-bit integer is
basically a 1-element array anyway, so we might just say it's always
an array and for SCMI only one element is allowed.)