Hi @CBris.1 ,
Did you check that STM32MP157D-DK1 GPIO connector pinout is able to provide required signals by your HAT board (refer to your board documentation or schematics) ?
Then, you have to define relevant signals for relevant peripherals in your pinmux device tree section.
Notice that some signals (e.g. SAI2 pins) are shared with internal peripherals and might be not connected by default (please refer to MB1272 Schematics or board User Manual). That might request to add some solder bridges.
Obviously, FDCAN or other peripherals should be enabled accordingly in the device tree.
Maybe have a look to :
Regards.
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