Re: [U-Boot] [PATCH v3] serial: Add serial driver for Intel MID

On Fri, Mar 3, 2017 at 12:31 PM, Kever Yang kever.yang@rock-chips.com wrote:

On 02/28/2017 08:04 PM, Andy Shevchenko 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.

Reviewed-by: Kever Yang kever.yang@rock-chips.com

Thanks!

Tom et all, is it forgotten?