Changes between Version 9 and Version 10 of linux/OTG

Timestamp:

04/01/2025 07:00:58 PM (40 hours ago)

Author:

Ryan Erbstoesser

Comment:

add otg note for venice

linux/OTG

@@ -43 +43 @@
 Note that the Vendor ID (VID) and Device ID (DID) that is presented to the USB host is configurable (see [https://www.kernel.org/doc/Documentation/usb/gadget_configfs.txt ​here] for details)
 
+=== Venice Device Mode
+
+Gateworks uses a Texas Instruments TPS25820/TPS25821 chip that only monitors the CC pins and will never pull CC1/CC2 down - it relies on external resistors for this and therefore it can not advertise as an Upstream Facing Port or behave as a dual-role port. The GW71xx USB host controller however 'can' operate as a sink as it has a dual-role USB controller; This is evident when you use a Type-C to Type-A device cable and load a gadget driver for example.
+
+In order to use the GW71xx as an Upstream Facing Port (UFP) device/sink a with a Type-C to Type-C cable to another device you would need to either be able to force the partner device to host mode manually (this can typically be done for Linux devices via device-tree or sysfs) or have a modified GW71xx which removes the TPS and loads optional 5.11kohm Rp resistors in locations R97/R96.
 
 [=#g_ether]