i.MX7D USB_OTG1_ID input mux

[tgbe]

The i.MX7D has one dedicated pad and four ALT pads for the USB_OTG1_ID input. I don't understand how to switch between dedicated input and ALT inputs (or why the ALT inputs exist in the first place).

First, there is the non-multiplexed pad USB_OTG1_ID.

Then, there are the following pads that can input USB_OTG1_ID as an ALT function:

GPIO1_IO12 ALT7
I2C4_SCL ALT4
SD2_WP ALT4
GPIO1_IO02 ALT7

With IOMUXC_USB_OTG1_ID_SELECT_INPUT, I can choose between the four ALT inputs, but not the dedicated pad. With the reset value (00), GPIO1_IO12 ALT7 should be used for the ID input.

How can I switch this to the dedicated pad instead?

[Alejandro_Salas]

Hello @tgbe 

I hope you are doing well.

Please refer to register: IOMUXC_LPSR_SW_MUX_CTL_PAD_GPIO1_IO02

SION will be set to 0 and MUX_MODE set to 111 that enables the USB_OTG1_ID function.

Best regards!