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    Subject[PATCH 0/8] serial: 8250: support hw-based RS485 direction control (finally!)
    Date
    Some 8250-variants control the direction pin for RS485 in hardware. Linux has
    RS485 support these days, so update the 8250-driver to adhere to that. There
    have been attempts for mainlining this before. So, I started with the version
    from Matthias which got no further comments, a proof-of-concept for the 16V2750
    from Jürgen, and reworked it to match the current state of RS485 in Linux. Some
    minor cleanup patches came along the way. Really looking forward to
    comments/tags, because I think it is really time to get this functionality into
    mainline once and for all ;)

    Code is based on 3.2-rc2, tested on a OMAP-based custom board with a 16V2750.
    A git tree can be found here:

    git://git.pengutronix.de/git/wsa/linux-2.6.git 8250_rs485

    Thanks and regards,

    Wolfram

    Matthias Fuchs (1):
    serial: 8250: Add ioctl to enable auto rs485 mode with some Exar UARTs

    Wolfram Sang (7):
    serial: 8250: replace hardcoded 0xbf with #define
    serial: 8250: save rs485_flags per instance
    serial: 8250: add RX_DURING_TX capability to RS485 mode
    serial: 8250: reject delaying RTS with RS485
    serial: 8250: update rs485 flags with polarity settings
    serial: 8250: add Exar 16V2750 support
    serial: 8250: fix comment about accessing EMSR

    drivers/tty/serial/8250.c | 143 +++++++++++++++++++++++++++++++++++++++---
    include/linux/serial_core.h | 3 +-
    include/linux/serial_reg.h | 4 +-
    3 files changed, 137 insertions(+), 13 deletions(-)

    --
    1.7.7.1

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