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| author | Albrecht Dreß <albrecht.dress@arcor.de> | 2010-04-26 11:18:12 +0000 |
|---|---|---|
| committer | Grant Likely <grant.likely@secretlab.ca> | 2010-07-24 18:27:57 -0600 |
| commit | 0d1f22e4907fec330ef0e475cb0dad48419498f2 (patch) | |
| tree | 85a5da2e1c59ddba4f186fcf8b8eae6605f87729 /kernel/srcu.c | |
| parent | b37fa16e78d6f9790462b3181602a26b5af36260 (diff) | |
| download | blackbird-op-linux-0d1f22e4907fec330ef0e475cb0dad48419498f2.tar.gz blackbird-op-linux-0d1f22e4907fec330ef0e475cb0dad48419498f2.zip | |
powerpc/5200: improve uart baud rate calculation (reach high baud rates, better accuracy)
On the MPC5200B, make very high baud rates (e.g. 3 MBaud) accessible and
achieve a higher precision for high baud rates in general. This is done by
selecting the appropriate prescaler (/4 or /32). As to keep the code clean,
the getuartclk method has been dropped, and all calculations are done in a
new set_baudrate method.
Notes: only "fsl,mpc5200b-psc-uart" compatible devices benefit from these
improvements.
Tested on a custom 5200B based board, from 110 baud up to 3 MBaud, and with
both "fsl,mpc5200b-psc-uart" and "fsl,mpc5200-psc-uart" devices.
Also tested on the mpc5121ads board.
Signed-off-by: Albrecht Dreß <albrecht.dress@arcor.de>
[agust: fixed mpc5121 prescaler comment]
Signed-off-by: Anatolij Gustschin <agust@denx.de>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Diffstat (limited to 'kernel/srcu.c')
0 files changed, 0 insertions, 0 deletions
