Hi everyone,
Recent issue that I had to deal with sparkled a discussion within my team, and seems like we are not sure what would be a proper way to go, even if there are multiple ways to do it. We decided to ask this question to open-source community, in case someone has thoughts about it.
At Toradex we have multiple computer on modules, each of those has few variants - different memory sizes, with or without WiFi/BT, etc. One of the options is also a temperature grade - IT and non-IT. Obviously, we want to keep number of device trees as minimal as possible, since number of device trees grows exponentially if we add a new option via device tree, i.e. imx8mm-verdin-it-wifi-dev.dts + imx8mm-verdin-nonit-wifi-dev.dts.
Hence, we are working on a change that would update trips temperatures in Linux device tree on the fly, setting them to whatever is read from CPU fuses. Now, the question is - where would be the best place to do it? So far we were thinking about following options:
- Patching U-Boot thermal driver so that it would propagate max temperature to Linux device tree. - Patching U-Boot board files to update Linux device tree via ft_board_setup(). This, however, will result in a duplicate code among different boards within same SoC family. - Anything else not listed here.
I would appreciate any comments or thoughts regarding this topic. Thanks,
Best regards, Andrejs Cainikovs.