linux-kernel - Re: [PATCH v1 09/10] cpufreq: qti: Introduce cpufreq for ipq95xx

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Message-ID: <CAA8EJpqox=Ji3cf5iBgL_QvqNZFmikiNu7bBscBYi4AsCdt9CQ@mail.gmail.com>
Date:   Thu, 7 Sep 2023 17:22:56 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Varadarajan Narayanan <quic_varada@...cinc.com>
Cc:     ilia.lin@...nel.org, agross@...nel.org, andersson@...nel.org,
        konrad.dybcio@...aro.org, rafael@...nel.org,
        viresh.kumar@...aro.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        mturquette@...libre.com, sboyd@...nel.org,
        quic_kathirav@...cinc.com, linux-pm@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org,
        Praveenkumar I <ipkumar@...eaurora.org>
Subject: Re: [PATCH v1 09/10] cpufreq: qti: Introduce cpufreq for ipq95xx

On Thu, 7 Sept 2023 at 08:24, Varadarajan Narayanan
<quic_varada@...cinc.com> wrote:
>
> IPQ95xx SoCs have different OPPs available for the CPU based on
> the SoC variant. This can be determined from an eFuse register
> present in the silicon.
>
> Added support for ipq95xx on nvmem driver which helps to
> determine OPPs at runtime based on the eFuse register which
> has the CPU frequency limits. opp-supported-hw dt binding
> can be used to indicate the available OPPs for each limit.
>
> Signed-off-by: Praveenkumar I <ipkumar@...eaurora.org>
> Signed-off-by: Kathiravan T <quic_kathirav@...cinc.com>
> Signed-off-by: Varadarajan Narayanan <quic_varada@...cinc.com>
> ---
>  drivers/cpufreq/cpufreq-dt-platdev.c |  1 +
>  drivers/cpufreq/qcom-cpufreq-nvmem.c | 20 ++++++++++++++++++++
>  2 files changed, 21 insertions(+)
>
> diff --git a/drivers/cpufreq/cpufreq-dt-platdev.c b/drivers/cpufreq/cpufreq-dt-platdev.c
> index f0c45d4..4ab29c0 100644
> --- a/drivers/cpufreq/cpufreq-dt-platdev.c
> +++ b/drivers/cpufreq/cpufreq-dt-platdev.c
> @@ -180,6 +180,7 @@ static const struct of_device_id blocklist[] __initconst = {
>
>         { .compatible = "qcom,ipq5332", },
>         { .compatible = "qcom,ipq8064", },
> +       { .compatible = "qcom,ipq9574", },
>         { .compatible = "qcom,apq8064", },
>         { .compatible = "qcom,msm8974", },
>         { .compatible = "qcom,msm8960", },
> diff --git a/drivers/cpufreq/qcom-cpufreq-nvmem.c b/drivers/cpufreq/qcom-cpufreq-nvmem.c
> index 49d21b0..de70225 100644
> --- a/drivers/cpufreq/qcom-cpufreq-nvmem.c
> +++ b/drivers/cpufreq/qcom-cpufreq-nvmem.c
> @@ -168,6 +168,25 @@ static int qcom_cpufreq_kryo_name_version(struct device *cpu_dev,
>         case QCOM_ID_APQ8096SG:
>                 drv->versions = 1 << ((unsigned int)(*speedbin) + 4);
>                 break;
> +       case QCOM_ID_IPQ9514:
> +       case QCOM_ID_IPQ9550:
> +       case QCOM_ID_IPQ9554:
> +       case QCOM_ID_IPQ9570:
> +       case QCOM_ID_IPQ9574:
> +               /* Fuse Value    Freq    BIT to set
> +                * ---------------------------------
> +                *   2’b00     No Limit     BIT(0)
> +                *   2’b10     1.8 GHz      BIT(1)
> +                *   2’b01     1.5 Ghz      BIT(2)
> +                *   2’b11     1.2 GHz      BIT(3)
> +                */
> +               if ((unsigned int)(*speedbin) == 2)
> +                       drv->versions = BIT(1);
> +               else if ((unsigned int)(*speedbin) == 1)
> +                       drv->versions = BIT(2);
> +               else
> +                       drv->versions = 1 << (unsigned int)(*speedbin);

If you change the order of speedbins 1 and 2 in DT, you can use 1 <<
speedbin for all the kinds,

> +               break;
>         default:
>                 BUG();
>                 break;
> @@ -375,6 +394,7 @@ static const struct of_device_id qcom_cpufreq_match_list[] __initconst = {
>         { .compatible = "qcom,qcs404", .data = &match_data_qcs404 },
>         { .compatible = "qcom,ipq5332", .data = &match_data_kryo },
>         { .compatible = "qcom,ipq8064", .data = &match_data_krait },
> +       { .compatible = "qcom,ipq9574", .data = &match_data_kryo },
>         { .compatible = "qcom,apq8064", .data = &match_data_krait },
>         { .compatible = "qcom,msm8974", .data = &match_data_krait },
>         { .compatible = "qcom,msm8960", .data = &match_data_krait },
> --
> 2.7.4
>


-- 
With best wishes
Dmitry