• Paul Burton's avatar
    MIPS: SEAD3: Probe UARTs using DT · c11e3b48
    Paul Burton authored
    Probe the UARTs on SEAD3 boards using device tree rather than platform
    code, in order to reduce the amount of the latter. This requires that
    CONFIG_SERIAL_OF_PLATFORM be enabled, so enable it in sead3_defconfig.
    The SEAD3 DT shim code is extended to read bootloader environment
    variables to determine the appropriate UART & mode for kernel console
    output & set the stdout-path property of the chosen node accordingly.
    
    In contrast to the old platform code, which appears to have only ever
    set "console=ttyS0,38400n8r" with the code in console_config never
    having an effect, this will honor the "yamontty" environment variable to
    select between the 2 UARTs on the board and then check the "modetty0" or
    "modetty1" variable as appropriate to determine the UART configuration.
    Signed-off-by: default avatarPaul Burton <paul.burton@imgtec.com>
    Cc: Rob Herring <robh+dt@kernel.org>
    Cc: Mark Rutland <mark.rutland@arm.com>
    Cc: linux-mips@linux-mips.org
    Cc: devicetree@vger.kernel.org
    Cc: linux-kernel@vger.kernel.org
    Patchwork: https://patchwork.linux-mips.org/patch/14048/Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
    c11e3b48
sead3-dtshim.c 4.5 KB