On Fri, May 28, 2021 at 10:39:31PM +0200, Stefan Agner wrote:

The QFN20 part has a different GPIO/port function assignment. The
configuration struct bit field ordered as TX/RX/RS485/WAKEUP/CLK
which exactly matches GPIO0-3 for QFN24/28. However, QFN20 has a
different GPIO to primary function assignment.

Special case QFN20 to follow to properly detect which GPIOs are
available.

Signed-off-by: Stefan Agner <stefan@agner.ch>
---
Tested on a custom PCB with a CP2102N QFP20 device. I noticed the bug after
configuring GPIO.2/3 to be TX/RX LED.

Thanks for fixing this, Stefan.

Nice and clean and patch, and your findings match the datasheet ("Table
4.2. GPIO Pin Alternate Functions").

Now applied for 5.13 with a stable tag.

Johan