• Michael Shych's avatar
    watchdog: mlx-wdt: introduce a watchdog driver for Mellanox systems. · c60923dd
    Michael Shych authored
    Introduce watchdog driver for a various range of Mellanox Ethernet and
    Infiniband switch systems.
    
    Watchdog driver for Mellanox watchdog devices, implemented in
    programmable logic device.
    
    Main and auxiliary watchdog devices can exist on the same system.
    There are several actions that can be defined in the watchdog:
    system reset, start fans on full speed and increase a counter.
    The last 2 actions are performed without a system reset.
    Actions without reset are provided for auxiliary watchdog devices,
    which is optional.
    Access to HW registers is performed through generic
    regmap interface.
    
    There are 2 types of HW watchdog implementations.
    Type 1: actual HW timeout can be defined as power of 2 msec.
    e.g. timeout 20 sec will be rounded up to 32768 msec.;
    maximum timeout period is 32 sec (32768 msec.);
    get time-left isn't supported
    Type 2: actual HW timeout is defined in sec. and it's the same as
    user-defined timeout;
    maximum timeout is 255 sec;
    get time-left is supported;
    
    Watchdog driver is probed from the common mlx_platform driver.
    Signed-off-by: default avatarMichael Shych <michaelsh@mellanox.com>
    Reviewed-by: default avatarGuenter Roeck <linux@roeck-us.net>
    Signed-off-by: default avatarGuenter Roeck <linux@roeck-us.net>
    Signed-off-by: default avatarWim Van Sebroeck <wim@linux-watchdog.org>
    c60923dd
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