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    Subject[PATCH v3 0/3] serial: 8250_dw: add fractional divisor support
    For Synopsys DesignWare 8250 uart which version >= 4.00a, there's a
    valid divisor latch fraction register. The fractional divisor width is
    4bits ~ 6bits.

    patch1 introduces necessary hooks to 8250 core.
    patch2 exports serial8250_do_set_divisor()
    patch3 implements the fractional divisor support for Synopsys DW 8250.

    Since v2:
    - rebase to tty-next branch, since I need one patch from Andy which
    is in tty-next
    - drop the patch "serial: 8250: let serial8250_get_divisor() get
    uart_port * as param" since it's in tty-next now.
    - add a new patch to export serial8250_do_set_divisor(), and reuse it
    to complete dw8250_set_divisor().
    - remove DW 8250 version check, since the DLF register always exists
    and if fractional divisor isn't supported, the register read as 0
    - add comments to explain how dw8250_get_divisor() get quot and frac.
    - the frac calcuation is simplified with well implemented GENMASK
    - Add Andy's Reviewed-by tag to patch1.

    Since v1:
    - add an extra patch to let serial8250_get_divisor() get uart_port *
    as param
    - take Andy's suggestions to "integrates hooks in the same way like
    it's done for the rest of 8250 ones". Many thanks to Andy.

    Jisheng Zhang (3):
    serial: 8250: introduce get_divisor() and set_divisor() hook
    serial: 8250: export serial8250_do_set_divisor()
    serial: 8250_dw: add fractional divisor support

    drivers/tty/serial/8250/8250_core.c | 4 +++
    drivers/tty/serial/8250/8250_dw.c | 45 +++++++++++++++++++++++++++++
    drivers/tty/serial/8250/8250_port.c | 30 +++++++++++++++----
    include/linux/serial_8250.h | 3 ++
    include/linux/serial_core.h | 7 +++++
    5 files changed, 84 insertions(+), 5 deletions(-)

    --
    2.18.0



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