linux-kernel - Re: [PATCH 2/7] arm64: dts: qcom: Add MSM8996v3.0 DTSI file

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Date:   Tue, 25 May 2021 22:18:45 -0500
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Konrad Dybcio <konrad.dybcio@...ainline.org>
Cc:     ~postmarketos/upstreaming@...ts.sr.ht, martin.botka@...ainline.org,
        angelogioacchino.delregno@...ainline.org,
        marijn.suijten@...ainline.org, jamipkettunen@...ainline.org,
        Andy Gross <agross@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/7] arm64: dts: qcom: Add MSM8996v3.0 DTSI file

On Tue 25 May 15:02 CDT 2021, Konrad Dybcio wrote:

> Add an overlay for MSM8996v3.0, which is a pre-final revision
> of the said SoC. It has some stark differences with regards to
> GPU, or more specifically its power delivery path. Oh, and of
> course a different msm-id.
> 
> Signed-off-by: Konrad Dybcio <konrad.dybcio@...ainline.org>
> ---
>  arch/arm64/boot/dts/qcom/msm8996-v3.0.dtsi | 59 ++++++++++++++++++++++
>  1 file changed, 59 insertions(+)
>  create mode 100644 arch/arm64/boot/dts/qcom/msm8996-v3.0.dtsi
> 
> diff --git a/arch/arm64/boot/dts/qcom/msm8996-v3.0.dtsi b/arch/arm64/boot/dts/qcom/msm8996-v3.0.dtsi
> new file mode 100644
> index 000000000000..b46f10b7413a
> --- /dev/null
> +++ b/arch/arm64/boot/dts/qcom/msm8996-v3.0.dtsi
> @@ -0,0 +1,59 @@
> +// SPDX-License-Identifier: GPL-2.0

BSD license?

> +/*
> + * Copyright (c) 2021, Konrad Dybcio <konrad.dybcio@...ainline.org>
> + */
> +
> +#include "msm8996.dtsi"
> +
> + / {
> +	qcom,msm-id = <246 0x30000>;
> + };
> +
> + /*
> +  * This revision seems to have differ GPU CPR
> +  * parameters, GPU frequencies and some differences
> +  * when it comes to voltage delivery to.. once again
> +  * the GPU. Funnily enough, it's simpler to make it an
> +  * overlay on top of 3.1 (the final one) than vice versa.
> +  * The differences will show here as more and more
> +  * features get enabled upstream.
> +  */
> +
> +gpu_opp_table_3_0: gpu-opp-table-30 {

Unused for now?

Can you link it up this with the &gpu even if you don't enable it
for now?

Regards,
Bjorn

> +	compatible = "operating-points-v2";
> +
> +	opp-624000000 {
> +		opp-hz = /bits/ 64 <624000000>;
> +		opp-level = <7>;
> +	};
> +
> +	opp-560000000 {
> +		opp-hz = /bits/ 64 <560000000>;
> +		opp-level = <6>;
> +	};
> +
> +	opp-510000000 {
> +		opp-hz = /bits/ 64 <510000000>;
> +		opp-level = <5>;
> +	};
> +
> +	opp-401800000 {
> +		opp-hz = /bits/ 64 <401800000>;
> +		opp-level = <4>;
> +	};
> +
> +	opp-315000000 {
> +		opp-hz = /bits/ 64 <315000000>;
> +		opp-level = <3>;
> +	};
> +
> +	opp-214000000 {
> +		opp-hz = /bits/ 64 <214000000>;
> +		opp-level = <3>;
> +	};
> +
> +	opp-133000000 {
> +		opp-hz = /bits/ 64 <133000000>;
> +		opp-level = <3>;
> +	};
> +};
> -- 
> 2.31.1
>