Hi Marek, > From: Marek Vasut <ma...@denx.de> > Sent: jeudi 15 octobre 2020 15:08 > > On 10/15/20 2:49 PM, Patrick Delaunay wrote: > > On some board, the ID pin is not connected so the B session must be > > overridden with "u-boot,force_b_session_valid" but the VBus sensing > > must continue to be handle. > > > > To managed it, this patch adds a new DT field > > "u-boot,force-vbus-detection" to use with "u-boot,force_b_session_valid" > > How is this solved in Linux ?
It is managed by Linux DWC2 driver: it is a real OTG driver, with dual mode support and by usb framework Throught the properties &usbotg_hs { usb-role-switch; }; a glue treat the session and the sensing management see linux/drivers/usb/dwc2/drd.c in linux-next PS: activate_stm_id_vb_detection is also used in driver = hsotg->params. As ID pin / vbus is completly managed by the USB TYPE driver C (STUSB1600 for STMicroelectronics board) and DWC2 driver with dual role stack (host/gadget). I don't found a better solution than device tree property for this task in U-Boot as DWC2 driver don't support dual role and U-Boot don't have framework for USB type C controller. > > btw can you do something about that huge change in indent ? Is it necessary ? I move all this code under activate_stm_id_vb_detection (linked to compatible "st,stm32mp1-hsotg") to avoid impact on other platform as this "sensing" properties are only support for STM32MP15X (it is linked to USB block detection integrated in SOC) And after I need to check the 1/ The usb33d-supply is required of vbus or IDPIN sensing 2/ manage Vbus sensing or override (according dt) 3/ manage IDPIN or override (according dt) I add a new property to be backward compatible (even it the combinaison is less clear) I protect regulator function call to avoid compilation issue for other platform. PS: after reading the refmanual, I also split VALOEN and VALOVAL bit update as it is required. So yes I think it is needed but I can split the patch to simplify the review. Patrick