• Holger Brunck's avatar
    net/wan/fsl_ucc_hdlc: add hdlc-bus support · 067bb938
    Holger Brunck authored
    This adds support for hdlc-bus mode to the fsl_ucc_hdlc driver. This can
    be enabled with the "fsl,hdlc-bus" property in the DTS node of the
    corresponding ucc.
    
    This aligns the configuration of the UPSMR and GUMR registers to what is
    done in our ucc_hdlc driver (that only support hdlc-bus mode) and with
    the QuickEngine's documentation for hdlc-bus mode.
    
    GUMR/SYNL is set to AUTO for the busmode as in this case the CD signal
    is ignored. The brkpt_support is enabled to set the HBM1 bit in the
    CMXUCR register to configure an open-drain connected HDLC bus.
    Signed-off-by: default avatarHolger Brunck <holger.brunck@keymile.com>
    Cc: Zhao Qiang <qiang.zhao@nxp.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    067bb938
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