On Thu, 19 Mar 2015, Jon Ringle wrote: > > > On Wed, 18 Mar 2015, Jakub Kicinski wrote: > > > From: Jakub Kicinski <kubakici@xxxxx> > > > > Users of RS-485 can request via ioctl that RTS signals should > > be activated selected number of milliseconds before the actual > > data transmission or stay active after the transmission is > > finished. In sc16is7xx, however, RTS signalling is handled by > > the hardware and driver has no way of providing this feature. > > > > Note: this change will make the driver return -EINVAL when the > > feature is requested (.delay_rts_*_send are set). > > Makes sense. I removed the use of .delay_rts_before_send that my user app > was setting and tested it and you are correct it. I am going to have to retract this. We have some modbus peripherals that communicate poorly if data is sent from the controller (this driver) to quickly after the RTS line switches states. Putting in a delay via .delay_rts_befor_send helps these peripherals communicate much much better reliability. > > > > Signed-off-by: Jakub Kicinski <kubakici@xxxxx> > > Signed-off-by: Jon Ringle <jringle@xxxxxxxxxxxxx> NAK -- 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
