UART serial port missing on IMX8QM

[Lincoln_Dessen]

Hi all,

 After I add two more pin configs in `arch/arm64/boot/dts/freescale/fsl-imx8qm-mek.dtsi` file:

Lincoln_Dessen_1-1687855353141.pngLincoln_Dessen_2-1687855381763.png

uart3 serial port ttyLP3 is missing in /dev:

Lincoln_Dessen_0-1687855259218.png

# dmesg | grep tty:

Lincoln_Dessen_3-1687855563041.png

 ttyLP3 only shows up If I remove GPIO0_IO03 and GPIO0_IO04 configs. 

Is there something wrong with my gpio setting in dts file? 

[Lincoln_Dessen · Accepted solution]

It seems the cause is I configure the same pin twice on different places.