linux-kernel - Re: [PATCH v2 1/1] arm64: dts: rockchip: rk3528: Add CPU frequency scaling support

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Message-Id: <20250718140110.308996-1-amadeus@jmu.edu.cn>
Date: Fri, 18 Jul 2025 22:01:10 +0800
From: Chukun Pan <amadeus@....edu.cn>
To: alchark@...il.com
Cc: amadeus@....edu.cn,
	conor+dt@...nel.org,
	devicetree@...r.kernel.org,
	heiko@...ech.de,
	jonas@...boo.se,
	krzk+dt@...nel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	linux-rockchip@...ts.infradead.org,
	ziyao@...root.org
Subject: Re: [PATCH v2 1/1] arm64: dts: rockchip: rk3528: Add CPU frequency scaling support

Hi,

> > Alexey suggested that we remove 408MHz, 600MHz and 816MHz from the
> > opp-table. Do you think it is acceptable to use 850mV for 1008MHz?
>
> But why 850 mV? Vendor .dtsi [1] implies that chips with leakage
> values of L0..L4 might be unstable at this frequency with a 850 mV
> supply and need 875 mV instead.

Because the actual frequency generated by 850mV is closer to 1008MHz.
Since we removed frequencies below 1GHz, all remaining frequencies are
generated by PVTPLL. I think it may not be necessary to use the maximum
values of opp-microvolt* ?

Thanks,
Chukun

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