GPIO in uboot

[abdrhmn]

Hi, 

I'm working on imx8ulp board. I would like to monitor and toggle gpio in uboot. 

1) how to know which gpio is available to use?

2) how to configure the gpio? Do i need to configure it in dts file?

[Alejandro_Salas]

Hello @abdrhmn 

I hope you are doing well.

Please refer to the U-boot gpio utility:

https://docs.u-boot.org/en/latest/usage/cmd/gpio.html

Best regards,

--... ...--

Salas.

[abdrhmn]

Hello @Alejandro_Salas ,

how to configure it programmatically? I always get return -22 when lookup for gpio name. 

take that as an example:

[Alejandro_Salas]

Hello @abdrhmn 

Please take a look to the mxc_gpio.c driver on uboot-imx.

Best regards,

Salas.