linux-kernel - Re: [PATCH 03/42] clk: at91: sam9x60: switch to parent_hw and parent

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Date:   Fri, 28 Jul 2023 20:28:38 -0700
From:   Stephen Boyd <sboyd@...nel.org>
To:     Claudiu Beznea <claudiu.beznea@...on.dev>,
        alexandre.belloni@...tlin.com, mripard@...nel.org,
        mturquette@...libre.com, nicolas.ferre@...rochip.com
Cc:     linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, varshini.rajendran@...rochip.com,
        Claudiu Beznea <claudiu.beznea@...on.dev>
Subject: Re: [PATCH 03/42] clk: at91: sam9x60: switch to parent_hw and parent_data

Quoting Claudiu Beznea (2023-07-26 22:31:17)
> @@ -177,31 +178,34 @@ static const struct {
>  
>  static void __init sam9x60_pmc_setup(struct device_node *np)
>  {
> +       struct clk_hw *td_slck_hw, *md_slck_hw, *main_xtal_hw, *main_rc_hw, *main_osc_hw;
> +       struct clk_hw *parent_hws[6], *hw, *usbck_hw;
> +       static struct clk_parent_data parent_data;
>         struct clk_range range = CLK_RANGE(0, 0);
> -       const char *td_slck_name, *md_slck_name, *mainxtal_name;
> +       const char *main_xtal_name = "main_xtal";
>         struct pmc_data *sam9x60_pmc;
> -       const char *parent_names[6];
> -       struct clk_hw *main_osc_hw;
>         struct regmap *regmap;
> -       struct clk_hw *hw;
> +       struct clk *clk;
>         int i;
>  
> -       i = of_property_match_string(np, "clock-names", "td_slck");
> -       if (i < 0)
> +       clk = of_clk_get_by_name(np, "td_slck");
> +       if (IS_ERR(clk))
>                 return;
> -
> -       td_slck_name = of_clk_get_parent_name(np, i);
> -
> -       i = of_property_match_string(np, "clock-names", "md_slck");
> -       if (i < 0)
> +       td_slck_hw = __clk_get_hw(clk);

Don't introduce more usage of __clk_get_hw(). The index for "td_slck"
should be known, and it can be used as the index member in struct
clk_parent_data.  This allows the clk framework to lazily find the
parent, instead of requiring the parent to be registered before this
code runs. It also reduces the usage of __clk_get_hw().