Hi Greg, Jiri,
This patch series adds support for variable sampling rates on the SCIFA
and SCIFB variants.
Currently the driver uses a fixed sampling rate divider (usually 16 or 32),
except on HSCIF (full range of 8 to 32). Supporting all available
sampling rates on SCIFA and SCIFB increases the range and accuracy of
supported baud rates.
E.g. on r8a7791/koelsch:
- Supports now 134, 150, and standard 500000-4000000 bps,
- Perfect match for 134, 150, 500000, 1000000, 2000000, and 4000000
bps,
- Accuracy has increased for most standard bps values.
Tested on:
- r8a7791/koelsch (Fully tested on SCIFA and SCIFB),
- r8a7740/armadillo (Fully tested on SCIFA and SCIFB),
- sh73a0/kzm9g (Fully tested on SCIFA only, no easy access to SCIFB),
- r8a73a4/ape6evm (SCIFA/FTDI console at 460800 bps, no easy access to
SCIFB).
This series depends on my scif-clk-sck-brg-for-v4.5 pull request.
Thanks for your comments!
Geert Uytterhoeven (5):
serial: sh-sci: Add more Serial Mode Register documentation
serial: sh-sci: Preserve SCIFA/SCIFB bit rate config for serial
console
serial: sh-sci: Use premultiplier to handle half sampling rate
serial: sh-sci: Use a bitmask to indicate supported sampling rates
serial: sh-sci: Add support for SCIFA/SCIFB variable sampling rates
drivers/tty/serial/sh-sci.c | 106 ++++++++++++++++++++++++++------------------
drivers/tty/serial/sh-sci.h | 15 +++++++
2 files changed, 77 insertions(+), 44 deletions(-)
--
1.9.1
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
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