• Stephen Warren's avatar
    ARM: bcm2835: implement machine restart hook · d0f1c7ff
    Stephen Warren authored
    Implement the machine restart hook using the SoC's watchdog timer module.
    To support this, define a DT binding for the watchdog module, and add it
    to the device tree.
    
    The downstream rpi-split branch contains a full watchdog timer driver
    implementation, which also implements the restart hook. However, the
    restart function is largely separate from the watchdog driver, so for
    simplicity, the restart hook is implemented here directly in the main
    machine source file.
    
    Overall structure (separate setup/restart) functions derived from the
    picoxcell ARM support.
    
    Watchdog register IO sequence taken from code by Simon Arlott. Note that
    the watchdog module is not documented in BCM2835-ARM-Peripherals.pdf.
    Signed-off-by: default avatarStephen Warren <swarren@wwwdotorg.org>
    d0f1c7ff
bcm2835.c 2.61 KB