Hi, Russell King - ARM Linux writes: > On Sun, Jul 07, 2013 at 01:51:14PM +0200, Lothar Waßmann wrote: > > Hi, > > > > Shawn Guo writes: > > > On Fri, Jul 05, 2013 at 02:12:30PM +0800, Huang Shijie wrote: > > > > There is something wrong with the RTS/CTS pads: > > > > The RTS pad is assigned with the CTS's value; > > > > while the CTS pad is assigned with the RTS's value. > > > > > > > > > > So basically, you are saying that select_input should be set up for CTS > > > rather than RTS. It seems that the people who generated the macro got > > > the wrong input from developer. > > > > > programming 'select_input' only makes sense for inputs, not outputs. > > Since CTS is an output signal, select_input only makes sense for the > > RTS function of the pads. > > Note: If you are a DTE, then RTS is an output, CTS is an input. If you > are a DCE, then RTS is an input and CTS is an output (normally on a > standard UART, you just swap the wiring for RTS and CTS but really that's > all that is going on.) So swapping them in software should be acceptable > too, provided you're not having to disable any auto flow control facilities. > Freescale had decided to implement their UARTs on the i.MX SoCs as DCE and later added a bit to switch between DCE and DTE mode. That's where all the confusion comes from. Lothar Waßmann -- ___________________________________________________________ Ka-Ro electronics GmbH | Pascalstraße 22 | D - 52076 Aachen Phone: +49 2408 1402-0 | Fax: +49 2408 1402-10 Geschäftsführer: Matthias Kaussen Handelsregistereintrag: Amtsgericht Aachen, HRB 4996 www.karo-electronics.de | info@xxxxxxxxxxxxxxxxxxx ___________________________________________________________ -- 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
