linux-kernel - Re: [PATCH v8 0/7] add thermal sensor driver for A64, A83T, H3, H5, H6, R40

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Date:   Fri, 7 Feb 2020 00:56:41 +0530
From:   Amit Kucheria <amit.kucheria@...durent.com>
To:     Amit Kucheria <amit.kucheria@...durent.com>,
        Vasily Khoruzhick <anarsoul@...il.com>,
        Yangtao Li <tiny.windzz@...il.com>,
        Zhang Rui <rui.zhang@...el.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Maxime Ripard <mripard@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Linux PM list <linux-pm@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        lakml <linux-arm-kernel@...ts.infradead.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v8 0/7] add thermal sensor driver for A64, A83T, H3, H5,
 H6, R40

On Thu, Feb 6, 2020 at 9:27 PM Ondřej Jirman <megous@...ous.com> wrote:
>
> Hi Amit,
>
> On Thu, Feb 06, 2020 at 07:43:59PM +0530, Amit Kucheria wrote:
> > Hi Vasily,
> >
> > For this entire series, the DTS files don't contain any trip points.
> > Did I miss some other series?
> >
> > At a minimum, you should add some "hot" or "critical" trip points
> > since then don't require a cooling-map with throttling actions. If you
> > have "passive" trip points, then you need to provide cooling-maps.
> >
> > Since this series has been merged, could you please follow up with a
> > fixup series to add the trip points?
>
> I don't think lack of trip points causes runtime issues. Or does it? I planned
> to send update with some trip points and cooling maps for 5.7 merge window.
> Is this acceptable?

Yes, I think that would be fine.

> If not, I can send a patch that adds:
>
> + trips {
> +         cpu-very-hot {
> +                 temperature = <100000>;
> +                 hysteresis = <0>;
> +                 type = "critical";
> +         };
> + };
>
> and
>
> + trips {
> +         gpu-very-hot {
> +                 temperature = <100000>;
> +                 hysteresis = <0>;
> +                 type = "critical";
> +         };
> + };
>
> everywhere where appropriate. Though that will make rebase of out of
> tree patches that already have a more complicated setup to be sent for the next
> merge window a bit tedious.

Right, don't do that.

> thank you,
>         Ondrej
>
> > Regards,
> > Amit
> > p.s. We should catch all this automatically, I'll send out yaml
> > bindings for the thermal framework soon that should catch this stuff.