SK-AM62: About Soc_USB1_VBUS

Hi,

Please check the AM62x Datasheet, USB1_VBUS pin doesn't have multiple pin mux modes, so the pin doesn't have pinmux defined in the device tree.

The pin is used to monitor the USB VBUS voltage. The pin generates interrupts when the VBUS voltage is in certain level according to the USB Specifications.

hi

I found in the data manual that the usb vbus is in the AB10 and AC10 pins. Can I change the AB10 and AC10 to other pins? Is the use of AB10 and AC10 in linux, such as determining interrupts or reading analog state in the usb-am62 driver?

thanks

tanks

HI

Would it be possible to modify the driver of dw3-am62 to enable USB 1 without detecting Vbus and only using USB device devices? Because the USB VBus is not connected in my self-made board.

thanks

Hi,

I believe you don't need to connect the USB1_VBUS pin if you use USB1 port in host-only mode. Please ensure you set 'dr_mode = "host"' in &usb1 node in your kernel board device tree. Please refer to &usb1 node in kernel k3-am62x-sk-common.dtsi.

Bin Liu said:

I believe you don't need to connect the USB1_VBUS pin if you use USB1 port in host-only mode

Does the usb1 use host mode and do not require vbus power supply? I'll create a new question that describes the problem I'm having.

thanks

Bin Liu said:

You just don't need to connect USB1_VBUS pin if you use USB1 port in host-only mode.

I can understand that usb1 is working in the host only state ·, can the AB10 USB_VBUS pin of my board be suspended? Does it not affect the detection of usb-am62 drivers?

thanks

hao teng said:

can the AB10 USB_VBUS pin of my board be suspended?

Do you mean AB10 pin is not brought out and not connect to anywhere? As explained before, AB10 doesn't have to be connected if USB1 is only used in host mode.

Bin Liu said:

Do you mean AB10 pin is not brought out and not connect to anywhere?

Yes, AB10 is not connected to anything. In this case, whether the usb1 running on the host is valid.

Bin Liu said:

AB10 doesn't have to be connected if USB1 is only used in host mode.

In sk-evm, my test is OK, because AB10 is directly connected to vbus.

https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1358320/am625-usb-vbus-on-and-off-test/5181386?tisearch=e2e-sitesearch&keymatch=usb%20VBUS#5181386

In this post, can I write a register to simulate the high and low levels of AB10 to implement interrupts.

The problem has been found. The hardware has changed the DM and DP to 5V, and now the host can identify it. Thank you very much for your help.