linux-kernel - Re: [PATCH V2] ARM: dts: omap3: Add cpu trips and cooling map for omap34/36 families

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Date:   Mon, 17 Aug 2020 15:02:27 -0500
From:   Adam Ford <aford173@...il.com>
To:     Andreas Kemnade <andreas@...nade.info>
Cc:     Linux-OMAP <linux-omap@...r.kernel.org>,
        Adam Ford-BE <aford@...conembedded.com>,
        Benoît Cousson <bcousson@...libre.com>,
        Tony Lindgren <tony@...mide.com>,
        Rob Herring <robh+dt@...nel.org>,
        devicetree <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "H. Nikolaus Schaller" <hns@...delico.com>
Subject: Re: [PATCH V2] ARM: dts: omap3: Add cpu trips and cooling map for
 omap34/36 families

On Mon, Aug 17, 2020 at 2:59 PM Andreas Kemnade <andreas@...nade.info> wrote:
>
> On Mon, 17 Aug 2020 08:39:31 -0500
> Adam Ford <aford173@...il.com> wrote:
>
> > The OMAP3530, OMAP3630, and DM3730 all show thresholds of 90C and 105C
> > depending on commercial or industrial temperature ratings.
> >
> > This patch expands the thermal information to include the limits of 90
> > and 105C for alert and critical.  It sets the coolings-cells for the
> > 34xx and 36xx CPU's which both point to omap3-cpu-thermal.dtsi.
> >
> > For boards who never use industrial temperatures, these can be
> > changed on their respective device trees with something like:
> >
> > &cpu_alert0 {
> >       temperature = <85000>; /* millicelsius */
> > };
> >
> > &cpu_crit {
> >       temperature = <90000>; /* millicelsius */
> > };
> >
> > OMAP3_THERMAL will need to be enabled.  It is off by default.
> >
> hmm, I think the patch for idling core when OMAP3_THERMAL is enabled
> got stuck somewhere. It still seems not to work. Shouldn't that patch
> be applied first?

I rebased the idle stuff, and now I get errors, so I haven't pushed it
yet.  I put a note that OMAP3_THERMAL is off by default, but this
patch would at least get the framing in there.  I know at least two of
us that use 1GHZ processors which are not supposed to run at that
speed above 90MHz, so the idea was to tolerate the higher current for
now, and when the idle stuff works, we'll enable the OMAP3_THERMAL by
default.

adam
>
> Regards,
> Andreas