• Martin Blumenstingl's avatar
    i2c: meson: implement the master_xfer_atomic callback · fe402bd0
    Martin Blumenstingl authored
    
    
    Boards with some of the 32-bit SoCs (mostly Meson8 and Meson8m2) use a
    Ricoh RN5T618 PMU which acts as system power controller. The driver for
    the system power controller may need to the I2C bus just before shutting
    down or rebooting the system. At this stage the interrupts may be
    disabled already.
    
    Implement the master_xfer_atomic callback so the driver for the RN5T618
    PMU can communicate properly with the PMU when shutting down or
    rebooting the board. The CTRL register has a status bit which can be
    polled to determine when processing has completed. According to the
    public S805 datasheet the value 0 means "idle" and 1 means "running".
    
    Signed-off-by: default avatarMartin Blumenstingl <martin.blumenstingl@googlemail.com>
    Reviewed-by: default avatarNeil Armstrong <narmstrong@baylibre.com>
    [wsa: converted some whitespace alignment]
    Signed-off-by: default avatarWolfram Sang <wsa@the-dreams.de>
    fe402bd0