How to use UART 2 pin as GPIO ? (PinxMux help needed for imx6ull14x14evk)

[ashoksundar]

I have almost read all the documents online and the discussion in the forums but still couldn't get through this pin muxing. 

I changed the function of the UART 2 pads in the device tree file imx6ull-14x14-evk.dts located in the folder (yocto/build/tmp/work-shared/imx6ull14x14evk/kernel-source/arch/arm/boot/dts) as below,

MX6UL_PAD_UART2_RTS_B__FLEXCAN2_RX 0x1b020
MX6UL_PAD_UART2_CTS_B__FLEXCAN2_TX 0x1b020

--------------------------------to----------------------------------------

MX6UL_PAD_UART2_RTS_B__GPIO1_IO23 0x1b020

MX6UL_PAD_UART2_CTS_B__GPIO1_IO22 0x1b020

but still i couldnt change the value of the GPIO23 that i exported through sysfs. It remains low all the time. I'm looking for steps that I need perform in order to make UART 2 pin as GPIO.

Any help would be much appreciated.

[diegoadrian]

Hello Ashok,

Thank you for writing.

This is what the i.MX pin tools throws me about the GPIOs configuration.

MX6ULL_PAD_UART2_RTS_B__GPIO1_IO23 0x000010B0

MX6ULL_PAD_UART2_CTS_B__GPIO1_IO22 0x000010B0

Also the RX and TX,

MX6ULL_PAD_UART2_RX_DATA_GPIO1_IO21 0x000010B0

MX6ULL_PAD_UART2_TX_DATA_GPIO2_IO20 0x000010B0

I hope this information can solve your question.

Best Regards,

Diego.