On Mon, Mar 29, 2010 at 4:48 AM, Feng Tang <feng.tang@xxxxxxxxx> wrote: >> + tx |= MAX3100_WD | MAX3100_RTS; > > Does this imply to have to work with HW flow control? on my platform > I have to remove the RTS bit to make it work. > Finally I had time to check this. If you compare the 8250 (or similar) data-sheet with the MAX31x0 one you see that the handling of the RTX/CTS bits is exactly the same (8250 about RTS bit for example: "When any of these bits are cleared, the associated output is forced high." and MAX3110: "Request-to-Send Bit. Controls the state of the RTS output. This bit is reset on power-up (RTS bit = 0 sets the RTS pin = logic high)."). If you look at the 8250.c driver (grep for UART_MCR_RTS) you notice that the bit is set on device open (together with DTR of course). So I think the driver is doing the right thing here. -- Christian Pellegrin, see http://www.evolware.org/chri/ "Real Programmers don't play tennis, or any other sport which requires you to change clothes. Mountain climbing is OK, and Real Programmers wear their climbing boots to work in case a mountain should suddenly spring up in the middle of the computer room." -- 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
