linux-kernel - Re: [PATCH v2 1/4] arm64: dts: qcom: ipq6018: add 1.2GHz CPU Frequency

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Message-Id: <20240306153610.1289999-1-amadeus@jmu.edu.cn>
Date: Wed,  6 Mar 2024 23:36:10 +0800
From: Chukun Pan <amadeus@....edu.cn>
To: dmitry.baryshkov@...aro.org
Cc: amadeus@....edu.cn,
	andersson@...nel.org,
	conor+dt@...nel.org,
	devicetree@...r.kernel.org,
	konrad.dybcio@...aro.org,
	krzysztof.kozlowski+dt@...aro.org,
	linux-arm-msm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	robh@...nel.org
Subject: Re: [PATCH v2 1/4] arm64: dts: qcom: ipq6018: add 1.2GHz CPU Frequency

Hi, Dmitry
> How is it "some"? You are enabling this opp for all IPQ6000 SoC instances.

This is not the case, please see `opp-supported-hw = <0x4>;`.
Also: https://github.com/torvalds/linux/blob/master/drivers/cpufreq/qcom-cpufreq-nvmem.c#L345
This 1.2GHz Frequency only takes effect when BIT(2) exists.
For fused 1.5GHz devices, the 1.2GHz frequency will not appear.
I have tested this patch on both fused 1.2GHz and 1.5GHz devices.

Thanks,
Chukun

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