Hello,
I am currently using a STM32MP157C. The OTG controller is used to add a USB device port with the OTG FS PHY transceiver.
The signals connected are:
- OTG_FS_DP
- OTG_FS_DM
- OTG_VBUS
I made the following configuration in the device tree:
usbotg_no_id_pin: usbotg-no-id-pin {};
usbotg_fs_dp_dm_pins_a: usbotg-fs-dp-dm-0 {
pins {
pinmux = <STM32_PINMUX('A', 11, ANALOG)>, // OTG_FS_DM
<STM32_PINMUX('A', 12, ANALOG)>; // OTG_FS_DP
};
};
&usbotg_hs{
status = "okay";
compatible = "st,stm32mp15-fsotg", "snps,dwc2";
pinctrl-names = "default";
pinctrl-0 = <&usbotg_no_id_pin &usbotg_fs_dp_dm_pins_a>;
dr_mode = "peripheral";
usb-role-switch;
snps,need-phy-for-wake
role-switch-default-mode = "peripheral";
};
The USB device port is working correctly with the gadget serial driver.
Once the board is suspended (with echo mem > /sys/power/state), I would like to wake it up when I plug or unplug an USB host. Or in others words, when a voltage modification is detected on VBUS. Does some one know if this is possible ?
According to the reference manual (RM0436, p3118): "OTG_WKUP becomes active (high state) when resume condition occurs during L1 SLEEP or L2 SUSPEND states.". Should I understand that this is the only way to wake up the STM32MP1 with the OTG controller ?
Thank you for any help you can give,
Quentin
