Comment # 3 on bug 1204063 from Andreas F���rber

A partial fix got merged already:
https://github.com/openSUSE/kernel-source/commit/8d7f37c61a0709c939caccfae67d6addce090bae#diff-a9e1c2425c9e8e93ddd3e6ee09170fbf9ca6182cdfcafde64937d42cfe05a5d5R4729

Remaining =y config change queued for master now.

Meanwhile a DT binding divergence between mainline and downstream has been
discovered: We need "fsl,imx8qm-lpuart", "fsl,imx8qxp-lpuart" rather than just
"fsl,imx8qm-lpuart".
Tests with the previous modified kernel remained unsuccessful though.