> You are not the first 'watchdog in firmware accessed via an SMC call'. > Is there some more detail about what implementation this is? Part of > TF-A? Defined by some spec (I can dream)? This is just some random implementation written by me because we needed one. I would like it to be the new generic implementation, but it sounds like people here prefer the naming to be MediaTek specific (at least for now). The other SMC watchdog we're aware of is imx_sc_wdt but unfortunately that seems to hardcode platform-specific details in the interface (at least in the pretimeout SMC) so we can't just expand that. With this driver I tried to directly wrap the kernel watchdog interface so it should be platform-agnostic and possible to expand this driver to other platforms later if desired. The SMC function ID would still always have to be platform-specific, unfortunately (but we could pass it in through the device tree), since the Arm SMC spec doesn't really leave any room for OS-generic SMCs like this.
