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dm: serial: Move baud rate calculation to ns16550.c

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Move the function that calculates the baud rate divisor into ns16550.c so
it can be used by that file.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass
2014-09-04 16:27:32 -06:00
parent 2a9ae6e02f
commit fa54eb1243
3 changed files with 34 additions and 11 deletions
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13
include/ns16550.h
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@@ -170,3 +170,16 @@ void NS16550_putc(NS16550_t com_port, char c);
char NS16550_getc(NS16550_t com_port);
int NS16550_tstc(NS16550_t com_port);
void NS16550_reinit(NS16550_t com_port, int baud_divisor);
/**
* ns16550_calc_divisor() - calculate the divisor given clock and baud rate
*
* Given the UART input clock and required baudrate, calculate the divisor
* that should be used.
*
* @port: UART port
* @clock: UART input clock speed in Hz
* @baudrate: Required baud rate
* @return baud rate divisor that should be used
*/
int ns16550_calc_divisor(NS16550_t port, int clock, int baudrate);