linux-kernel - Re: [PATCH v3 6/8] arm64: dts: qcom: ipq5332: populate the opp table based on the eFuse

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Message-ID: <b1926ed8-fbe2-4428-aa23-dc4279553417@linaro.org>
Date:   Wed, 18 Oct 2023 19:51:39 +0200
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Varadarajan Narayanan <quic_varada@...cinc.com>, agross@...nel.org,
        andersson@...nel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        mturquette@...libre.com, sboyd@...nel.org, rafael@...nel.org,
        viresh.kumar@...aro.org, ilia.lin@...nel.org,
        quic_kathirav@...cinc.com, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-pm@...r.kernel.org
Subject: Re: [PATCH v3 6/8] arm64: dts: qcom: ipq5332: populate the opp table
 based on the eFuse



On 10/18/23 11:29, Varadarajan Narayanan wrote:
> IPQ53xx have different OPPs available for the CPU based on
> SoC variant. This can be determined through use of an eFuse
> register present in the silicon.
> 
> Add support to read the eFuse and populate the OPPs based on it.
> 
> 	------------------------------------------------
> 	Frequency	BIT2	BIT1	opp-supported-hw
> 			1.1GHz	1.5GHz
> 	------------------------------------------------
> 	1100000000	1	1	0xf
BIT(0) | BIT(1) | BIT(2) is 0x7

> 	1500000000	0	1	0x3
> 	------------------------------------------------
> 
> Signed-off-by: Kathiravan T <quic_kathirav@...cinc.com>
> Signed-off-by: Varadarajan Narayanan <quic_varada@...cinc.com>
> ---
> v2:	Fix inconsistencies in comment and move it to commit log
> 	as suggested
> 	Remove opp-microvolt entries as no regulator is managed by Linux
> 	cpu_speed_bin -> cpu-speed-bin in node name
> 	Remove "nvmem-cell-names" due to dtbs_check error
> ---
>   arch/arm64/boot/dts/qcom/ipq5332.dtsi | 19 ++++++++++++++++---
>   1 file changed, 16 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/qcom/ipq5332.dtsi b/arch/arm64/boot/dts/qcom/ipq5332.dtsi
> index 4206f05..a0dcba3 100644
> --- a/arch/arm64/boot/dts/qcom/ipq5332.dtsi
> +++ b/arch/arm64/boot/dts/qcom/ipq5332.dtsi
> @@ -91,11 +91,19 @@
>   	};
>   
>   	cpu_opp_table: opp-table-cpu {
> -		compatible = "operating-points-v2";
> +		compatible = "operating-points-v2-kryo-cpu";
>   		opp-shared;
> +		nvmem-cells = <&cpu_speed_bin>;
>   
> -		opp-1488000000 {
> -			opp-hz = /bits/ 64 <1488000000>;
> +		opp-1100000000 {
> +			opp-hz = /bits/ 64 <1100000000>;
> +			opp-supported-hw = <0xF>;
hex literals must be lowercase.

Konrad