linux-kernel - Re: [PATCH v2 4/8] clk: qcom: apss-ipq6018: ipq5332: add safe source switch for a53pll

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Message-ID: <1dfef5d380b3a5f920620fbf491280f9.sboyd@kernel.org>
Date:   Thu, 12 Oct 2023 13:51:00 -0700
From:   Stephen Boyd <sboyd@...nel.org>
To:     Varadarajan Narayanan <quic_varada@...cinc.com>, agross@...nel.org,
        andersson@...nel.org, conor+dt@...nel.org,
        devicetree@...r.kernel.org, ilia.lin@...nel.org,
        konrad.dybcio@...aro.org, krzysztof.kozlowski+dt@...aro.org,
        linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        mturquette@...libre.com, quic_kathirav@...cinc.com,
        rafael@...nel.org, robh+dt@...nel.org, viresh.kumar@...aro.org
Cc:     Varadarajan Narayanan <quic_varada@...cinc.com>
Subject: Re: [PATCH v2 4/8] clk: qcom: apss-ipq6018: ipq5332: add safe source switch for a53pll

Quoting Varadarajan Narayanan (2023-10-12 02:26:20)
> diff --git a/drivers/clk/qcom/apss-ipq6018.c b/drivers/clk/qcom/apss-ipq6018.c
> index 4e13a08..c05c2b2 100644
> --- a/drivers/clk/qcom/apss-ipq6018.c
> +++ b/drivers/clk/qcom/apss-ipq6018.c
> @@ -84,15 +87,63 @@ static const struct qcom_cc_desc apss_ipq6018_desc = {
>         .num_clks = ARRAY_SIZE(apss_ipq6018_clks),
>  };
>  
> +static int cpu_clk_notifier_fn(struct notifier_block *nb, unsigned long action,
> +                               void *data)
> +{
> +       struct clk_hw *hw;
> +       u8 index;
> +       int err;
> +
> +       if (action == PRE_RATE_CHANGE)
> +               index = P_GPLL0;
> +       else if ((action == POST_RATE_CHANGE) || (action == ABORT_RATE_CHANGE))

This has too many parenthesis.

> +               index = P_APSS_PLL_EARLY;
> +       else
> +               return 0;

Maybe 'return NOTIFY_OK' instead?

> +
> +       hw = &apcs_alias0_clk_src.clkr.hw;
> +       err = clk_rcg2_mux_closest_ops.set_parent(hw, index);
> +
> +       return notifier_from_errno(err);
> +}
> +
> +static struct notifier_block cpu_clk_notifier = {

Instead of a static global can this be allocated with kzalloc?

> +       .notifier_call = cpu_clk_notifier_fn,
> +};
> +
>  static int apss_ipq6018_probe(struct platform_device *pdev)