Re: [PATCH v9 0/8] Improve Qualcomm EUD driver and platform support

[Gopikrishna Garmidi]

On 9/30/2026 3:05 AM, Elson Serrao wrote:
> The Embedded USB Debugger (EUD) is a High-Speed USB on-chip hub that
> provides debug and trace capabilities on Qualcomm platforms. The current
> EUD driver, however, lacks essential hardware resources such as PHY
> references and support for multi-port configurations. This series
> addresses those gaps and introduces the necessary device tree updates
> to enable testing and validation of the enhanced functionality.
>
> Below is a high-level block diagram showing the EUD and its connections.
>
>
> 			              EUD Block
>   	                   +------------------------------+
> 			   |                              |
> [Conn-0]-->[USB2PHY-0]---->|-------- Path 0 --------------|-->[USBCtrl-0]
> 			   |                              |
> [Conn-1]-->[USB2PHY-1]---->|-------- Path 1 --------------|-->[USBCtrl-1]
> 			   |                              |
> 			   |      +------------------+    |
> 			   |      |  EUD Debug Hub   |    |
> 			   |      +------------------+    |
> 			   +------------------------------+
>
> The series has been validated on the Qualcomm Dragonwing Q6 platform
> (RB3 Gen2 board), confirming successful OpenOCD connectivity to the EUD
> interface. For detailed usage instructions, refer to Qualcomm’s Linux
> kernel debugging guide:
> https://docs.qualcomm.com/bundle/publicresource/topics/80-70020-12/debugging_linux_kernel.html#debug-using-openocd
Tested patches 2-7 on Glymur-CRD, EUD port selection and role switching
work as expected. Patch 8 (Kodiak DT) not tested.

Tested-by: Gopikrishna Garmidi <gopikrishna.garmidi@xxxxxxxxxxxxxxxx>