On Fri, Dec 06, 2013 at 03:28:37AM +0400, Sergei Ianovich wrote: > pxa2xx-uart was a separate uart platform driver. It was declaring > the same device names and numbers as 8250 driver. As a result, > it was impossible to use 8250 driver on PXA SoCs. > > Upon closer examination pxa2xx-uart turned out to be a clone of > 8250_core driver. [...] > +/* Uart divisor latch write */ > +static void serial_pxa_dl_write(struct uart_8250_port *up, int value) > +{ > + serial_out(up, UART_DLL, value & 0xff); > + serial_out(up, UART_DLM, value >> 8 & 0xff); > +} This is a change. drivers/tty/serial/pxa.c did read back UART_DLL as an errata work around: > - /* > - * work around Errata #75 according to Intel(R) PXA27x Processor Family > - * Specification Update (Nov 2005) > - */ > - dll = serial_in(up, UART_DLL); > - WARN_ON(dll != (quot & 0xff)); If this is no longer needed, serial_pxa_dl_write can be removed because it is same as default_serial_dl_write. I did not check the other errata work arounds. -- James Cameron http://quozl.linux.org.au/ -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html