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    Subject[PATCH v2 0/4] ntb: idt: Add hwmon temperature sensor interface
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    IDT PCIe-switches are equipped with an embedded temperature sensor. It
    works within the range [0; 127.5]C with a resolution of 0.5C. It can
    be used to monitor the chip core temperature so to have prevent it from
    possible overheating. It might be very topical for the chip, since it
    gets heated like in hell especially if ASPM isn't enabled.

    Other than the current sampled temperatur, the sensor interface exposes
    history registors with lowest and highest measured temperature, thresholds
    and alarm IRQs enabled/disable bits, ADC/filter settings. The device manual
    states that the switch is able to generate a msi interrupt on PCIe upstreams
    if the temperature crosses one of three configurable thresholds. But in
    practice we discovered that the enable/disable threshold IRQs bits interface
    is very broken (see the third patch commit message), so it can't be used
    to create the hwmon alarm interface. As the result we had to remove the
    already available temperature sensor IRQ handler and disable the corresponding
    interrupt.

    Current version of the driver provides following standard hwmon sysfs
    files: temperature input, lowest and highest measured temperature
    with possibility to reset the history, temperature offset. The rest of the
    nodes can't be safely implemented for the chip due to the described issues.

    Changelog v2:
    - Add "select HWMON" to the NTB_IDT kconfig

    Signed-off-by: Serge Semin <fancer.lancer@gmail.com>

    Serge Semin (4):
    ntb: idt: Alter temperature read method
    ntb: idt: Add basic hwmon sysfs interface
    ntb: idt: Discard temperature sensor IRQ handler
    ntb: idt: Alter the driver info comments

    drivers/ntb/hw/idt/Kconfig | 4 +-
    drivers/ntb/hw/idt/ntb_hw_idt.c | 317 ++++++++++++++++++++++++++++++++++------
    drivers/ntb/hw/idt/ntb_hw_idt.h | 87 ++++++++++-
    3 files changed, 353 insertions(+), 55 deletions(-)

    --
    2.12.0

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