Hi Shimodaさん > From: Yoshihiro Shimoda > Sent: Thursday, November 15, 2018 4:20 AM > > Host does NOT work: > > //else > > // /* No otg, so default to host mode */ > > // writel(0x00000000, usb2_base + USB2_COMMCTRL); > > I got it. However, I have a concern how to set the mode to peripheral on > RZ/A2 > if we applied this code. If someone would like to use the USB as > peripheral > on his board, this code is not suitable. But USB peripheral is a different driver. So, this code will not run. So USB2_COMMCTRL will keep the default value 0x80000000. Correct? > So, I have an idea to set the default mode by using "dr_mode" property, > instead of hardcoded. Since the driver already has such a function, > we can reuse rcar_gen3_device_recognition() to set the default value. > To achieve that, we need to modify the following though. > - Don't enable "is_otg_channel". > - Don't call rcar_gen3_enable_vbus_ctrl() to avoid ADPCTRL register > because RZ/A2 doesn't have it. > - Don't need to call rcar_gen3_set_linectrl to avoid LINECTRL1 register > because RZ/A2 doesn't seem to need the setting on host mode. > > What do you think? If a board is designed for USB peripheral, why would they enable a EHCI host driver for the same USB channel? I am confused. > > > (In other words, if we use the port as peripheral with the reset value > > > 0x80000000, does it work?) > > > > We have not been able to get USB peripheral working on RZ/A2 yet. > > For peripheral, RZ/A2 has HS-USB. > > After plugging into the PC, HS-USB goes to Suspended state (DVSQ = > "0110"). > > It should go to Configured state (DVSQ = "0011") > > I guess we need to modify ./drivers/usb/renesas_usbhs/rza.c for RZ/A2 > because RZ/A2's HS-USB has SYSCFG.CNEN, but doesn't have SYSCFG.UPLLE? Today for RZ/A1, we tell people to use USB0 first in their board design, then use USB1 if they need a second USB channel. USB pins are dedicated (no other function) so there should be no design conflicts. If only USB1 is used, USB0 must also be enabled in DT as a dummy driver (so SYSCFG.UPLLE can get set for USB1). > > According to the RZ/A2 Hardware Manual, COMMCTRL should be 0x80000000 > when > > using HS-USB. > > > > There are 2 channels of USB on RZ/A2 (host x 2, HS_USB x 2) > > I got it. So, I guess someone wants to use 1 host and 1 peripheral :) Yes. Chris
