Hi Jerry,
I tried it before your comment.
Now I find the others feedback about the issue.
I modify cfg as follows, export gpio491 and read gpio status of debugfs.
-pinmux, 0x02212460 = 0x00000000; config Z3
+pinmux, 0x02212460 = 0x00000003; config Z3
$sudo cat /sys/kernel/debug/gpio |grep 491
gpio-491(SPI0_SCK | sysfs ) out lo
I generated .cfg file by the tool of Jetpack 4.5.1 and I compared to the default .cfg file.
I cannot find config Z3 on .cfg file that generated by me.
I think the issue is related to the tool.
I would like to set default pull high, please teach me how to pull high it on .cfg file.
If it does work, can you provide the method to modified pinmux by dts?