The mpc5200b is a bug fix of the mpc5200 with a few incompatible
changes.
By rights, the current dts trees are the most "correct", but in
practical
purposes there is no value in the 5200b devices having 2 compatible
entries for each internal peripheral node. Freescale has done a good
job
of documenting exactly where the incompatibilities lie, so it restrict
the extra compatible properties to devices with *documented* changes.
And what happens when later an "undocumented change" is found? The
device tree should always list the exact version of device used, even
if all clients (i.e., the Linux kernel) only use the less-specific
"compatible" value; that way, if a need to distinguish arises later
(e.g., a model-specific bug workaround), a client can detect the exact
model of device without needing a new device tree (that the client in
general has no control over).
Removing the extra 'b' fields makes the device trees smaller
That's nice in general, but it hardly overrides more serious concerns.
Segher
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