Arnd Bergmann wrote:

I think it's a reasonable assumption that someone will sooner or later
put that hardware into an ARM32 machine,

I'm going to have to disagree.  If they haven't done it by now, I can't 
imagine any ARM SOC vendor creating a 32-bit ARM SOC with an SBSA 
watchdog in it.  I can imagine a vendor trying to repurpose an existing 
32-bit ARM SOC for the server market, but that SOC won't have an SBSA 
watchdog in it.

 > or run a 32-bit kernel on

a chip that has it.

That might happen, but I would be very surprised, and I would need to be 
convinced that it's useful.

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