• Adamski, Krzysztof (Nokia - PL/Wroclaw)'s avatar
    i2c: axxia: support slave mode · f0b57680
    This device contains both master and slave controllers which can be
    enabled simultaneously. Both controllers share the same SDA/SCL lines
    and interrupt source but has separate control and status registers.
    Controllers also works in loopback mode - slave device can communicate
    with its own master controller internally. The controller can handle up
    to two addresses, both of which may be 10 bit. Most of the logic
    (sending (N)ACK, handling repeated start or switching between
    write/read) is handled automatically which makes working with this
    controller quite easy.
    For simplicity, this patch adds basic support, limiting to only one
    slave address. Support for the 2nd device may be added in the future.
    Note that synchronize_irq() is used to ensure any running slave interrupt
    is finished to make sure slave i2c_client structure can be safely used
    by i2c_slave_event.
    Signed-off-by: default avatarKrzysztof Adamski <krzysztof.adamski@nokia.com>
    Reviewed-by: default avatarAlexander Sverdlin <alexander.sverdlin@nokia.com>
    Signed-off-by: default avatarWolfram Sang <wsa@the-dreams.de>
i2c-axxia.c 23 KB