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

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Message-Id: <20250717070006.192765-1-amadeus@jmu.edu.cn>
Date: Thu, 17 Jul 2025 15:00:06 +0800
From: Chukun Pan <amadeus@....edu.cn>
To: jonas@...boo.se
Cc: alchark@...il.com,
	amadeus@....edu.cn,
	conor+dt@...nel.org,
	devicetree@...r.kernel.org,
	heiko@...ech.de,
	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 Jonas,

> One possible difference here is that the actual CPU rate is controlled
> by a PVTPLL where TF-A will configure a osc ring-length based on the
> requested rate and Linux only configure the regulator voltage.
>
> I have no idea if the configuration made by TF-A will have any affect on
> power usage, but I suggest we keep all opp here because both TF-A and
> Linux is involved in configuring the CPU rate.
>
> The measured rate can typically be read from a PVTPLL status reg, it
> will be different depending on the ring-length, voltage and silicon
> quality for the rates >= 816 MHz.

Alexey suggested that we remove 408MHz, 600MHz and 816MHz from the
opp-table. Do you think it is acceptable to use 850mV for 1008MHz?

Thanks,
Chukun

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