1PPS pin on iMX8MP

[khang_letruong]

Dear NXP Team,

I would like to connect the PPS output of GNSS module to iMX8MP but I wonder if it should be a generic GPIO or a specific GPIO like in the following discussion : https://community.nxp.com/t5/i-MX-Processors/how-to-config-1PPS-on-imx8qxp/m-p/1050249

We plan to use the below :

+       pinctrl_gnsspps: gnsspps_grp {
+               fsl,pins = <
+                       MX8MP_IOMUXC_SAI3_RXD__GPIO4_IO30       0x19
+               >;
+       };

Is our configuration correct ?

Best Regards,

Khang

[khang_letruong · Accepted solution]

The following link helps to resolve my issue : https://community.nxp.com/t5/i-MX-Processors/PPS-driver-fails-to-probe-GPIO-on-i-MX-8X-i-MX-8M-Mini/...

[joanxie]

pls refer to this link

"https://community.nxp.com/t5/i-MX-Processors/How-to-get-IEEE-1588-1PPS-on-i-MX6Q/m-p/551121"

[khang_letruong]

Hi @joanxie ,

Thanks for the link but it seems that I was not clear in my use-case : I would like to capture the 1PPS input signal from a GPS/GNSS module rather than to generate the 1PPS output signal.

I found the similar use-case : https://community.nxp.com/t5/i-MX-Processors/i-MX6s-dl-input-PPS-to-FEC-for-PTP-Grand-master-ENET-15...

or this : https://community.nxp.com/t5/i-MX-Processors/Ntpd-gpsd-GPS-PPS/m-p/773608

Best Regards,

Khang