+ max-data-speed:       a positive non 0 value that determines the max data rate
+                       that can be used in CAN-FD mode. A value of -1 implies
+                       CAN-FD is not supported by the transceiver.
+
+Examples:

(..)

+       fixed-transceiver {
+               max-data-speed = <(-1)>;

Looks ugly IMHO.

Why didn't you stay on '0' for 'not supported'??

Regards,
Oliver

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