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DP83867CS: Test mode can be set only to channel A

Part Number: DP83867CS

We have problems to drive PHY tests modes to all channels, only channel A is working.

It seems that TMCH_CTRL (0x0025) register value is 0 and it is not changing after writing it.

Default value should be 400 regarding datasheet which is also very weird since it is 0 when reading.

-Mikko-