On Tue, 2016-03-01 at 09:54 -0800, amarburg@xxxxxxxxxxxxxxxxxx wrote: > From: Aaron Marburg <amarburg@xxxxxxxxxxxxxxxxxx> > > The USOPTL4-4P and USOPTL4-2P USB-to-quad/dual RS-485/422 hubs use the > Moschip 7840/7820. For correct operation in RS-485, the chip must be > configured in “RS-485 mode” through the scratchpad register as per the > datasheet. This strobes the DTR line on transmission, enabling the driver > on the RS485 transceiver chip. I think if you include a config option to do this, you should also enable the canonical way of using an ioctl(). That means you need to support rs485_config(). Regards Oliver -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
