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    SubjectRe: [PATCH v3 4/7] thermal/drivers/tegra: Add driver for Tegra30 thermal sensor
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    [Cc Viresh]

    On 29/05/2021 19:09, Dmitry Osipenko wrote:
    > All NVIDIA Tegra30 SoCs have a two-channel on-chip sensor unit which
    > monitors temperature and voltage of the SoC. Sensors control CPU frequency
    > throttling, which is activated by hardware once preprogrammed temperature
    > level is breached, they also send signal to Power Management controller to
    > perform emergency shutdown on a critical overheat of the SoC die. Add
    > driver for the Tegra30 TSENSOR module, exposing it as a thermal sensor
    > and a cooling device.

    IMO it does not make sense to expose the hardware throttling mechanism
    as a cooling device because it is not usable anywhere from the thermal
    framework.

    Moreover, that will collide with the thermal / cpufreq framework
    mitigation (hardware sets the frequency but the software thinks the freq
    is different), right ?

    The hardware limiter should let know the cpufreq framework about the
    frequency change.

    https://lkml.org/lkml/2021/6/8/1792

    May be post the sensor without the hw limiter for now and address that
    in a separate series ?

    -- Daniel

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