linux-kernel - Re: [PATCH v13 6/8] clk: qcom: cpu-8996: Add support to switch to alternate PLL

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Message-ID: <153979032539.5275.12064078400966025600@swboyd.mtv.corp.google.com>
Date:   Wed, 17 Oct 2018 08:32:05 -0700
From:   Stephen Boyd <sboyd@...nel.org>
To:     ilia.lin@...il.com
Cc:     Rajendra Nayak <rnayak@...eaurora.org>,
        Ilia Lin <ilialin@...eaurora.org>,
        Michael Turquette <mturquette@...libre.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Andy Gross <andy.gross@...aro.org>,
        David Brown <david.brown@...aro.org>,
        Will Deacon <will.deacon@....com>,
        Amit Kucheria <amit.kucheria@...aro.org>,
        linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-soc@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v13 6/8] clk: qcom: cpu-8996: Add support to switch to alternate
 PLL

Quoting ilia.lin@...il.com (2018-06-14 14:53:53)
> @@ -227,6 +232,26 @@ clk_cpu_8996_mux_determine_rate(struct clk_hw *hw, struct clk_rate_request *req)
>         return 0;
>  }
>  
> +int cpu_clk_notifier_cb(struct notifier_block *nb, unsigned long event,

static? And name it something like clk_cpu_8996_notifier?

> +                       void *data)
> +{
> +       int ret;
> +       struct clk_cpu_8996_mux *cpuclk = to_clk_cpu_8996_mux_nb(nb);
> +
> +       switch (event) {
> +       case PRE_RATE_CHANGE:
> +               ret = clk_cpu_8996_mux_set_parent(&cpuclk->clkr.hw, ALT_INDEX);
> +               break;
> +       case POST_RATE_CHANGE:
> +               ret = clk_cpu_8996_mux_set_parent(&cpuclk->clkr.hw, PLL_INDEX);
> +               break;
> +       default:
> +               ret = 0;
> +               break;
> +       }
> +
> +       return notifier_from_errno(ret);
> +};