linux-kernel - Re: [PATCH] arm64: dts: allwinner: h6: Use dedicated CPU OPP table for Tanix TX6

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Message-ID: <20200428075156.65okklrupingiza6@gilmour.lan>
Date:   Tue, 28 Apr 2020 09:51:56 +0200
From:   Maxime Ripard <maxime@...no.tech>
To:     Clément Péron <peron.clem@...il.com>
Cc:     Chen-Yu Tsai <wens@...e.org>, Rob Herring <robh+dt@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        linux-sunxi <linux-sunxi@...glegroups.com>,
        Piotr Oniszczuk <warpme@...pl>
Subject: Re: [PATCH] arm64: dts: allwinner: h6: Use dedicated CPU OPP table
 for Tanix TX6

On Sun, Apr 26, 2020 at 02:17:09PM +0200, Clément Péron wrote:
> Tanix TX6 has a fixed regulator. As DVFS is instructed to change
> voltage to meet OPP table. The DVFS is not working as expected.
> 
> Introduce a dedicated OPP Table where voltage are equals to
> the fixed regulator.
> 
> Reported-by: Piotr Oniszczuk <warpme@...pl>
> Fixes: add1e27fb703 ("arm64: dts: allwinner: h6: Enable CPU opp tables for Tanix TX6")
> Signed-off-by: Clément Péron <peron.clem@...il.com>

I'm not really a big fan of duplicating the OPPs, since that would make an
update of those very likely to be overlooked for that particular board (and
since it's a board that not a lot of people have, it would be harder to notice
too).

IIRC, removing the cpu-supply property should work as well?

Maxime

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