linux-kernel - Re: [PATCH RFT v1 1/3] drm/panfrost: enable devfreq based the "operating-points-v2" property

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Date:   Wed, 8 Jan 2020 13:38:00 +0100
From:   Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To:     Robin Murphy <robin.murphy@....com>
Cc:     dri-devel@...ts.freedesktop.org, alyssa@...enzweig.io,
        steven.price@....com, tomeu.vizoso@...labora.com, robh@...nel.org,
        linux-kernel@...r.kernel.org, daniel@...ll.ch, airlied@...ux.ie,
        linux-amlogic@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org
Subject: Re: [PATCH RFT v1 1/3] drm/panfrost: enable devfreq based the
 "operating-points-v2" property

Hi Robin,

On Wed, Jan 8, 2020 at 12:18 PM Robin Murphy <robin.murphy@....com> wrote:
>
> On 07/01/2020 11:06 pm, Martin Blumenstingl wrote:
> > Decouple the check to see whether we want to enable devfreq for the GPU
> > from dev_pm_opp_set_regulators(). This is preparation work for adding
> > back support for regulator control (which means we need to call
> > dev_pm_opp_set_regulators() before dev_pm_opp_of_add_table(), which
> > means having a check for "is devfreq enabled" that is not tied to
> > dev_pm_opp_of_add_table() makes things easier).
>
> Hmm, what about cases like the SCMI DVFS protocol where the OPPs are
> dynamically discovered rather than statically defined in DT?
where can I find such an example (Amlogic SoCs use SCPI instead of
SCMI, so I don't think that I have any board with SCMI support) or
some documentation?
(I could only find SCPI clock and CPU DVFS implementations, but no
generic "OPPs for any device" implementation)


Martin