stm32mp255 USB-C VBUS GPIO device tree configuration

[erich664]

I am trying to configure a USB-C connector on a peripheral device to detect VBUS via GPIO (PH9). I have tried several iterations using the following device tree documentation.

- 3.3.1. DT configuration example as high speed OTG, with micro-B connector, Vbus and ID mapped on GPIOs

- 3.3.3 DT configuration example as USB2-speed only USB3DR in Peripheral mode, with micro-B(ID left unconnected) or Type-C connector

The only way I have been able to get USB traffic to occur is by using the role-switch-default-mode attribute, but that comes with the warning about VBUS:

Forcing default mode bypasses the vbus detection, which is normally required to raise the pull-up resistor on D+ data line. This makes it non compliant with USB specifications. Recommended method to implement peripheral only role, is to use GPIO to detect Vbus,

And I suspect this warning is the reason why USB traffic doesn't come back after coming back out of suspend/low-power mode.

Example snippet of a configuration I've tried is as follows:

/ {
	usb_c_connector {
		compatible = "usb-c-connector";
		label = "USB-C Connector";
		type = "usb-c";
		vbus-gpios = <&gpioh 9 (GPIO_ACTIVE_HIGH | GPIO_PULL_UP)>;
		vbus-supply = <&scmi_vdd3v3_usb>;

		port {
			dwc3_ep: endpoint {
				remote-endpoint = <&typec_ep>;
			};
		};
	};
};
&usb3dr {
	status = "okay";

	dwc3:usb@48300000{
		maximum-speed = "high-speed";
		usb-role-switch;

		port {
			typec_ep: endpoint {
				remote-endpoint = <&dwc3_ep>;
			};
		};
    };
};

Is there an example using the DWC3 driver with a `typec` connector and/or VBUS via GPIO?

[erich664 · Accepted solution]

/ {
 usb-b-connector {
        compatible = "gpio-usb-b-connector", "usb-b-connector";
        label = "USB-C";
        type = "mini";
        vbus-gpios = <&gpioh 9 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>;

        port {
            con_usb3dr_ep: endpoint {
                remote-endpoint = <&usb3dr_ep>;
            };
        };
    };
};
&usb3dr {
    status = "okay";

    /* USER CODE BEGIN usb3dr */
    dwc3:usb@48300000{
        maximum-speed = "high-speed";
        usb-role-switch;
        port {
            usb3dr_ep: endpoint {
                remote-endpoint = <&con_usb3dr_ep>;
            };
        };
    };
    /* USER CODE END usb3dr */
};

I was able to end up getting this working with the following device tree configuration: