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

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Message-ID: <CAOX2RU4BOc6SPbYygq=iMR5EmCvHFtkiBjxXGm7pLDgPY_-7UA@mail.gmail.com>
Date: Fri, 8 Mar 2024 09:51:12 +0100
From: Robert Marko <robimarko@...il.com>
To: Chukun Pan <amadeus@....edu.cn>
Cc: 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

On Thu, 7 Mar 2024 at 04:26, Chukun Pan <amadeus@....edu.cn> wrote:
>
> Hi, Robert
> > Can I ask the source of this voltage level?
> > Because, its not present in the downstream QCA tree at all.
>
> This voltage level is what I guessed through the mhz tool.
> The downstream QCA tree uses 0.8625v voltage corresponding
> to 1.32GHz, which does not need to be so high.

Well, I am not so sure that it will work for every piece of silicon out there.
In OpenWrt we got bit by fixed voltages on IPQ8074 and had to move to the
downstream CPR driver as the variations between the same family are quite big.

Regards,
Robert
>
> Thanks,
> Chukun
>
> --
> 2.25.1
>