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

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Message-Id: <20250720140010.218235-1-amadeus@jmu.edu.cn>
Date: Sun, 20 Jul 2025 22:00:10 +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,

> > Because the actual frequency generated by 850mV is closer to 1008MHz.
>
> Which likely means that you have an -L5 chip. It will be different on
> other chips - it's a lottery of silicon quality.

The rk3528 board I have has -L3 and -L5 levels.
-L3 level tested at 850mV (mainline kernel) actual frequency is 1055MHz.

Frankly speaking, I have always doubted whether the voltage value of BSP
is correct. The voltage of BSP kernel at 1800MHz and 2016MHz is too low,
and no board can reach the corresponding actual frequency.
For example, if we set the CPU frequency to 2016MHz when running the BSP
kernel, the actual frequency can only reach 1800MHz.

Thanks,
Chukun

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