Hi, I would like to add rs485 support to the Synopsys DesignWare uart, 8250_dw.c but need help on how this should be done. rs485 background: Simplified rs485 is a half duplex standard where the RTS signal needs to be high during the whole transmit and low during receive. The Atmel AT91 for example have a rs485 mode where the hardware handles the RTS signal automatically. Most other uart controllers don't have this mode feature so toggling RTS needs to be done manually or semi-automatically from the driver. problem: To toggle RTS i would like to implement code in ops->start_tx and possibly ops->startup or ops->stop_tx. I also need to implement a ioctl callback to configure the rs485 part. These ops are not available in 8250_dw.c but in the framework 8250_core.c (except for ioctl). So should I add the rs485 support to the 8250 framework or should I export callbacks and implement the functionality in the 8250_dw.c? Any suggestions? BR, Mattias Wallin -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
