linux-kernel - Re: [Letux-kernel] [RFC PATCH 0/3] Enable 1GHz support on omap36xx

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Message-ID: <CAHCN7xKq1CszKxax+7sG4O_V+iBYLSDVtDC480gvGV+KVb2-sw@mail.gmail.com>
Date:   Wed, 11 Sep 2019 12:49:53 -0500
From:   Adam Ford <aford173@...il.com>
To:     "H. Nikolaus Schaller" <hns@...delico.com>
Cc:     Nishanth Menon <nm@...com>,
        Linux-OMAP <linux-omap@...r.kernel.org>,
        Tony Lindgren <tony@...mide.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        André Roth <neolynx@...il.com>,
        Discussions about the Letux Kernel 
        <letux-kernel@...nphoenux.org>
Subject: Re: [Letux-kernel] [RFC PATCH 0/3] Enable 1GHz support on omap36xx

On Wed, Sep 11, 2019 at 12:43 PM H. Nikolaus Schaller <hns@...delico.com> wrote:
>
> Hi Adam,
>
> > Am 11.09.2019 um 18:01 schrieb H. Nikolaus Schaller <hns@...delico.com>:
> >
> >>
> >> Am 11.09.2019 um 17:56 schrieb Adam Ford <aford173@...il.com>:
> >>
> >>> There are some subtleties for testing.
> >>>
> >>> * I have added turbo-mode; to OPP6 / OPP1G
> >>> * which means they are available but not used by the ondemand govenor
> >>> * to enable them one has to echo 1 >/sys/devices/system/cpu/cpufreq/boost
> >>
> >> Will that be documented somewhere? If not, can we put a comment in the
> >> device tree so people know how to enable it?
> >
> > It seems to be pretty standard on i86 systems if you google for "turbo mode".
> > I have added it to the commit message which adds the vbb regulator.
>
> And, I am not sure if DT maintainers will accept comments about the
> Linux /sys implementation in device tree files or bindings. Those
> should be independent of Linux.

OK.
>
> Basically the turbo-mode property is a hint to the OPP system (which
> may or may not use of it).
>
> So I think it is indeed better to have it in the commit message and
> not the code.

That makes sense.

>
> One more thought: as long as we do not have junction temperature monitoring
> we should keep it off by default... We may even remove the turbo-mode
> designator if we have the 90°C limit and smart reflex working.

We're almost there!

adam
>
> BR,
> Nikolaus
>