On Fri, Jul 18, 2025 at 02:26:15PM +0800, Chaoyi Chen wrote: > From: Chaoyi Chen <chaoyi.c...@rock-chips.com> > > The RK3399 has two USB/DP combo PHY. With the help of external Type-C > controller, the PHY can switch altmode between USB and DP. > > Their connection diagram is shown below: > > external Type-C Chip0 ---> USB/DP PHY0 ---+ > | <----> CDN-DP controller > external Type-C Chip1 ---> USB/DP PHY1 ---+
It looks like your "external" controller is not described. Look at your port property - "Connection to USB Type-C connector". Lack of proper hardware description leads you to claim that the PHY is the mode switch. I have doubts on that. You already received the comments that you need to come with rationale why making PHY a USB switch is correct. I don't see the arguments for that. Best regards, Krzysztof
