linux-kernel - Re: [PATCH V4 7/8] thermal: da9062/61: Thermal junction temperature monitoring driver

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Message-ID: <b2d2809e-b71e-5db0-2aeb-4773dc58960d@arm.com>
Date:   Tue, 15 Nov 2016 09:46:51 +0000
From:   Lukasz Luba <lukasz.luba@....com>
To:     Steve Twiss <stwiss.opensource@...semi.com>,
        Eduardo Valentin <edubezval@...il.com>,
        LINUX-KERNEL <linux-kernel@...r.kernel.org>,
        LINUX-PM <linux-pm@...r.kernel.org>,
        Zhang Rui <rui.zhang@...el.com>
Cc:     DEVICETREE <devicetree@...r.kernel.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Guenter Roeck <linux@...ck-us.net>,
        LINUX-INPUT <linux-input@...r.kernel.org>,
        LINUX-WATCHDOG <linux-watchdog@...r.kernel.org>,
        Lee Jones <lee.jones@...aro.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Support Opensource <support.opensource@...semi.com>,
        Wim Van Sebroeck <wim@...ana.be>
Subject: Re: [PATCH V4 7/8] thermal: da9062/61: Thermal junction temperature
 monitoring driver

On 14/11/16 08:22, Steve Twiss wrote:
> From: Steve Twiss <stwiss.opensource@...semi.com>
>
> Add junction temperature monitoring supervisor device driver, compatible
> with the DA9062 and DA9061 PMICs. A MODULE_DEVICE_TABLE() macro is added.
>
> If the PMIC's internal junction temperature rises above TEMP_WARN (125
> degC) an interrupt is issued. This TEMP_WARN level is defined as the
> THERMAL_TRIP_HOT trip-wire inside the device driver.
>
> The thermal triggering mechanism is interrupt based and happens when the
> temperature rises above a given threshold level. The component cannot
> return an exact temperature, it only has knowledge if the temperature is
> above or below a given threshold value. A status bit must be polled to
> detect when the temperature falls below that threshold level again. A
> kernel work queue is configured to repeatedly poll and detect when the
> temperature falls below this trip-wire, between 1 and 10 second intervals
> (defaulting at 3 seconds).
>
> This first level of temperature supervision is intended for non-invasive
> temperature control, where the necessary measures for cooling the system
> down are left to the host software.
>
> Signed-off-by: Steve Twiss <stwiss.opensource@...semi.com>
>
Looks good to me.

Reviewed-by: Lukasz Luba <lukasz.luba@....com>

Regards,
Lukasz