linux-kernel - Re: [PATCH V2 3/3] arm64: dts: qcom: ipq5018: enable the CPUFreq support

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Date:   Sat, 23 Sep 2023 22:15:25 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Gokul Sriram Palanisamy <quic_gokulsri@...cinc.com>
Cc:     agross@...nel.org, andersson@...nel.org, konrad.dybcio@...aro.org,
        mturquette@...libre.com, sboyd@...nel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, jassisinghbrar@...il.com,
        linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        quic_varada@...cinc.com, quic_srichara@...cinc.com
Subject: Re: [PATCH V2 3/3] arm64: dts: qcom: ipq5018: enable the CPUFreq support

On Fri, 22 Sept 2023 at 11:44, Gokul Sriram Palanisamy
<quic_gokulsri@...cinc.com> wrote:
>
> Add the APCS, A53 PLL, cpu-opp-table nodes to set
> the CPU frequency at 800MHz (idle) or 1.008GHz.
>
> Co-developed-by: Sricharan Ramabadhran <quic_srichara@...cinc.com>
> Signed-off-by: Sricharan Ramabadhran <quic_srichara@...cinc.com>
> Signed-off-by: Gokul Sriram Palanisamy <quic_gokulsri@...cinc.com>
> ---
>  arch/arm64/boot/dts/qcom/ipq5018.dtsi | 40 +++++++++++++++++++++++++++
>  1 file changed, 40 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/qcom/ipq5018.dtsi b/arch/arm64/boot/dts/qcom/ipq5018.dtsi
> index 9f13d2dcdfd5..a04b2019c779 100644
> --- a/arch/arm64/boot/dts/qcom/ipq5018.dtsi
> +++ b/arch/arm64/boot/dts/qcom/ipq5018.dtsi
> @@ -5,6 +5,7 @@
>   * Copyright (c) 2023 The Linux Foundation. All rights reserved.
>   */
>
> +#include <dt-bindings/clock/qcom,apss-ipq.h>
>  #include <dt-bindings/interrupt-controller/arm-gic.h>
>  #include <dt-bindings/clock/qcom,gcc-ipq5018.h>
>  #include <dt-bindings/reset/qcom,gcc-ipq5018.h>
> @@ -36,6 +37,8 @@ CPU0: cpu@0 {
>                         reg = <0x0>;
>                         enable-method = "psci";
>                         next-level-cache = <&L2_0>;
> +                       clocks = <&apcs_glb APCS_ALIAS0_CORE_CLK>;
> +                       operating-points-v2 = <&cpu_opp_table>;
>                 };
>
>                 CPU1: cpu@1 {
> @@ -44,6 +47,8 @@ CPU1: cpu@1 {
>                         reg = <0x1>;
>                         enable-method = "psci";
>                         next-level-cache = <&L2_0>;
> +                       clocks = <&apcs_glb APCS_ALIAS0_CORE_CLK>;
> +                       operating-points-v2 = <&cpu_opp_table>;
>                 };
>
>                 L2_0: l2-cache {
> @@ -54,6 +59,23 @@ L2_0: l2-cache {
>                 };
>         };
>
> +       cpu_opp_table: opp-table-cpu {
> +               compatible = "operating-points-v2";
> +               opp-shared;
> +
> +               opp-800000000 {
> +                       opp-hz = /bits/ 64 <800000000>;
> +                       opp-microvolt = <1100000>;
> +                       clock-latency-ns = <200000>;
> +               };
> +
> +               opp-1008000000 {
> +                       opp-hz = /bits/ 64 <1008000000>;
> +                       opp-microvolt = <1100000>;
> +                       clock-latency-ns = <200000>;
> +               };
> +       };
> +
>         firmware {
>                 scm {
>                         compatible = "qcom,scm-ipq5018", "qcom,scm";
> @@ -181,6 +203,24 @@ v2m1: v2m@...0 {
>                         };
>                 };
>
> +               a53pll: clock@...6000 {
> +                       compatible = "qcom,ipq5018-a53pll";
> +                       reg = <0x0b116000 0x40>;
> +                       #clock-cells = <0>;
> +                       clocks = <&xo_board_clk>;
> +                       clock-names = "xo";
> +               };
> +
> +               apcs_glb: mailbox@...1000 {
> +                       compatible = "qcom,ipq5018-apcs-apps-global",
> +                                    "qcom,ipq6018-apcs-apps-global";
> +                       reg = <0x0b111000 0x1000>;
> +                       #clock-cells = <1>;
> +                       clocks = <&a53pll>, <&xo_board_clk>, <&gcc GPLL0>;
> +                       clock-names = "pll", "xo", "gpll0";
> +                       #mbox-cells = <1>;
> +               };

Hmm, no, I was too quick to R-B. 0xb111 < 0xb116, please change these two nodes.

> +
>                 timer@...0000 {
>                         compatible = "arm,armv7-timer-mem";
>                         reg = <0x0b120000 0x1000>;
> --
> 2.34.1
>


-- 
With best wishes
Dmitry