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Reword a comment block a bit; no functional changes.

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This commit is contained in:
Ian Lepore 2014-04-26 20:27:58 +00:00
parent 60ad8150c7
commit 49d0a4c3ff
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=264985
1 changed files with 8 additions and 7 deletions
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15
sys/dev/uart/uart_dev_imx.c
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@ -131,13 +131,14 @@ imx_uart_init(struct uart_bas *bas, int baudrate, int databits,
/*
* The hardware has an extremely flexible baud clock: it allows setting
* both the numerator and denominator of the divider, as well as a
* separate pre-divider. We simplify that problem by assuming a
* pre-divider and numerator of one because our base clock is so fast we
* can reach virtually any reasonable speed with a simple divisor. The
* numerator value actually includes the 16x over-sampling; the register
* value is the numerator-1, so we have a hard-coded 15. Note that a
* quirk of the hardware requires that both UBIR and UBMR be set back to
* back in order for the change to take effect.
* separate pre-divider. We simplify the problem of coming up with a
* workable pair of numbers by assuming a pre-divider and numerator of
* one because our base clock is so fast we can reach virtually any
* reasonable speed with a simple divisor. The numerator value actually
* includes the 16x over-sampling (so a value of 16 means divide by 1);
* the register value is the numerator-1, so we have a hard-coded 15.
* Note that a quirk of the hardware requires that both UBIR and UBMR be
* set back to back in order for the change to take effect.
*/
if (baudrate > 0) {
baseclk = imx_ccm_uart_hz();