I just stumbled over commit 97c37f4014b0e3bacf31fe5b6ba890cc7f465838 which
changes this:

-       depends on ARCH_IMX25 || ARCH_IMX35
+       depends on !ARCH_IMX21 && !ARCH_IMX21

The double !ARCH_IMX21 looks fishy. Can't tell if the second IMX21 should
have been something else.

Regards,

   Wolfram

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