https://community.nxp.com/t5/i-MX-Processors/UART-serial-port-missing-on-IMX8QM/m-p/1677478#M208255 <P>It seems the cause is I configure the same pin twice on different places.&nbsp;&nbsp;</P> Wed, 28 Jun 2023 05:38:01 GMT Lincoln_Dessen 2023-06-28T05:38:01Z https://community.nxp.com/t5/i-MX-Processors/UART-serial-port-missing-on-IMX8QM/m-p/1676870#M208211 <P>Hi all,</P><P>&nbsp;After I add two more pin configs in `arch/arm64/boot/dts/freescale/fsl-imx8qm-mek.dtsi` file:</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="Lincoln_Dessen_1-1687855353141.png" style="width: 435px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/229602iB67C1A0286295836/image-dimensions/435x123?v=v2" width="435" height="123" role="button" title="Lincoln_Dessen_1-1687855353141.png" alt="Lincoln_Dessen_1-1687855353141.png" /></span><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="Lincoln_Dessen_2-1687855381763.png" style="width: 428px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/229603i1AB4F508400614CF/image-dimensions/428x106?v=v2" width="428" height="106" role="button" title="Lincoln_Dessen_2-1687855381763.png" alt="Lincoln_Dessen_2-1687855381763.png" /></span></P><P>uart3 serial port ttyLP3 is missing in /dev:</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="Lincoln_Dessen_0-1687855259218.png" style="width: 617px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/229601i7E0EEB8215DD78BB/image-dimensions/617x54?v=v2" width="617" height="54" role="button" title="Lincoln_Dessen_0-1687855259218.png" alt="Lincoln_Dessen_0-1687855259218.png" /></span></P><P># dmesg | grep tty:</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="Lincoln_Dessen_3-1687855563041.png" style="width: 621px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/229604iA299E5FA92752B36/image-dimensions/621x59?v=v2" width="621" height="59" role="button" title="Lincoln_Dessen_3-1687855563041.png" alt="Lincoln_Dessen_3-1687855563041.png" /></span></P><P>&nbsp;</P><P>&nbsp;ttyLP3 only shows up If I remove GPIO0_IO03 and&nbsp;GPIO0_IO04 configs.&nbsp;</P><P>Is there something wrong with my gpio setting in dts file?&nbsp;</P><P>&nbsp;</P> Tue, 27 Jun 2023 08:58:02 GMT https://community.nxp.com/t5/i-MX-Processors/UART-serial-port-missing-on-IMX8QM/m-p/1676870#M208211 Lincoln_Dessen 2023-06-27T08:58:02Z https://community.nxp.com/t5/i-MX-Processors/UART-serial-port-missing-on-IMX8QM/m-p/1677478#M208255 <P>It seems the cause is I configure the same pin twice on different places.&nbsp;&nbsp;</P> Wed, 28 Jun 2023 05:38:01 GMT https://community.nxp.com/t5/i-MX-Processors/UART-serial-port-missing-on-IMX8QM/m-p/1677478#M208255 Lincoln_Dessen 2023-06-28T05:38:01Z