topic How to declare a GPIO pin in devicetree ? in i.MX Processors

How to declare a GPIO pin in devicetree ?

toanjunifer — Mon, 16 Sep 2019 03:57:15 GMT

Hi NXP,

As question above, I get a trouble when approach GPIO in iMX6UL-EVK board.

After find out location of GPIO 25 pin, I try to configure it by:

$ echo 25 > /sys/class/gpio/export
$ echo "out" > /sys/class/gpio/gpio25/direction
$ echo 1 > /sys/class/gpio/gpio25/value

And I test with a red LED. But LED is still no light. (LED is working good with other device and GPIO pin is exactly. )

Does this problem is belong to declare GPIO pin devicetree ? And what should I do now ?

Thank you so much,

Toan

Yuri — Mon, 16 Sep 2019 05:40:05 GMT

Hello,

use imx6ul.dtsi : gpio1 should be included; usrt2 disabled.

Have a great day,

Yuri

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