linux-kernel - Re: [PATCH v1] clk: mediatek: mt8183: Register 13MHz clock earlier for clocksource

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Date:   Fri, 07 Jun 2019 10:59:21 -0700
From:   Stephen Boyd <sboyd@...nel.org>
To:     Matthias Brugger <matthias.bgg@...il.com>,
        Nicolas Boichat <drinkcat@...omium.org>,
        Rob Herring <robh@...nel.org>, Weiyi Lu <weiyi.lu@...iatek.com>
Cc:     James Liao <jamesjj.liao@...iatek.com>,
        Fan Chen <fan.chen@...iatek.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mediatek@...ts.infradead.org, linux-clk@...r.kernel.org,
        srv_heupstream@...iatek.com, stable@...r.kernel.org,
        Weiyi Lu <weiyi.lu@...iatek.com>,
        Dehui Sun <dehui.sun@...iatek.com>
Subject: Re: [PATCH v1] clk: mediatek: mt8183: Register 13MHz clock earlier for clocksource

Quoting Weiyi Lu (2019-06-06 20:11:52)
> diff --git a/drivers/clk/mediatek/clk-mt8183.c b/drivers/clk/mediatek/clk-mt8183.c
> index 9d86510..a8f50bc 100644
> --- a/drivers/clk/mediatek/clk-mt8183.c
> +++ b/drivers/clk/mediatek/clk-mt8183.c
> @@ -1167,37 +1169,62 @@ static int clk_mt8183_apmixed_probe(struct platform_device *pdev)
>         return of_clk_add_provider(node, of_clk_src_onecell_get, clk_data);
>  }
>  
> +static struct clk_onecell_data *top_clk_data;
> +
> +static void clk_mt8183_top_init_early(struct device_node *node)
> +{
> +       int i;
> +
> +       if (!top_clk_data) {

Is this function ever called more than once? I believe the answer is no
so this check should be removed.

> +               top_clk_data = mtk_alloc_clk_data(CLK_TOP_NR_CLK);
> +
> +               for (i = 0; i < CLK_TOP_NR_CLK; i++)
> +                       top_clk_data->clks[i] = ERR_PTR(-EPROBE_DEFER);
> +       }
> +
> +       mtk_clk_register_factors(top_early_divs, ARRAY_SIZE(top_early_divs),
> +                       top_clk_data);
> +
> +       of_clk_add_provider(node, of_clk_src_onecell_get, top_clk_data);
> +}
> +
> +CLK_OF_DECLARE_DRIVER(mt8183_topckgen, "mediatek,mt8183-topckgen",
> +                       clk_mt8183_top_init_early);
> +
>  static int clk_mt8183_top_probe(struct platform_device *pdev)
>  {
>         struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>         void __iomem *base;
> -       struct clk_onecell_data *clk_data;
>         struct device_node *node = pdev->dev.of_node;
>  
>         base = devm_ioremap_resource(&pdev->dev, res);
>         if (IS_ERR(base))
>                 return PTR_ERR(base);
>  
> -       clk_data = mtk_alloc_clk_data(CLK_TOP_NR_CLK);
> +       if (!top_clk_data)
> +               top_clk_data = mtk_alloc_clk_data(CLK_TOP_NR_CLK);

And then this can be removed because top_clk_data must be allocated at
this point.