On 28 February 2017 at 05:04, Andy Shevchenko <andriy.shevche...@linux.intel.com> wrote: > Add a specific serial driver for Intel MID platforms. > > It has special fractional divider which can be programmed via UART_PS, > UART_MUL, and UART_DIV registers. > > The UART clock is calculated as > > UART clock = XTAL * UART_MUL / UART_DIV > > The baudrate is calculated as > > baud rate = UART clock / UART_PS / DLAB > > Initialize fractional divider correctly for Intel Edison platform. > > For backward compatibility we have to set initial DLAB value to 16 > and speed to 115200 baud, where initial frequency is 29491200Hz, and > XTAL frequency is 38.4MHz. > > Signed-off-by: Andy Shevchenko <andriy.shevche...@linux.intel.com> > --- > drivers/serial/Kconfig | 9 +++++ > drivers/serial/Makefile | 1 + > drivers/serial/serial_intel_mid.c | 69 > +++++++++++++++++++++++++++++++++++++++ > 3 files changed, 79 insertions(+) > create mode 100644 drivers/serial/serial_intel_mid.c
Reviewed-by: Simon Glass <s...@chromium.org> _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/listinfo/u-boot
