linux-kernel - Re: [PATCH v3 15/31] clk: mediatek: Implement mtk_clk_unregister_fixed

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Date:   Tue, 15 Feb 2022 14:35:39 +0800
From:   Chun-Jie Chen <chun-jie.chen@...iatek.com>
To:     Chen-Yu Tsai <wenst@...omium.org>, Stephen Boyd <sboyd@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Matthias Brugger <matthias.bgg@...il.com>
CC:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Miles Chen <miles.chen@...iatek.com>,
        <linux-clk@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 15/31] clk: mediatek: Implement
 mtk_clk_unregister_fixed_clks() API

On Tue, 2022-02-08 at 20:40 +0800, Chen-Yu Tsai wrote:
> mtk_clk_register_fixed_clks(), as the name suggests, is used to
> register
> a given list of fixed rate clks. However it is lacking a counterpart
> unregister API.
> 
> Implement said unregister API so that the various clock platform
> drivers
> can utilize it to do proper unregistration, cleanup and removal.
> 
> In the header file, the register function's declaration is also
> reformatted to fit code style guidelines.
> 
> Signed-off-by: Chen-Yu Tsai <wenst@...omium.org>
> Reviewed-by: Miles Chen <miles.chen@...iatek.com>
> Reviewed-by: AngeloGioacchino Del Regno <
> angelogioacchino.delregno@...labora.com>

Reviewed-by: Chun-Jie Chen <chun-jie.chen@...iatek.com>
> ---
>  drivers/clk/mediatek/clk-mtk.c | 20 ++++++++++++++++++++
>  drivers/clk/mediatek/clk-mtk.h |  6 ++++--
>  2 files changed, 24 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/clk/mediatek/clk-mtk.c
> b/drivers/clk/mediatek/clk-mtk.c
> index 0c5db3c71fdd..7c0d5706eed7 100644
> --- a/drivers/clk/mediatek/clk-mtk.c
> +++ b/drivers/clk/mediatek/clk-mtk.c
> @@ -80,6 +80,26 @@ void mtk_clk_register_fixed_clks(const struct
> mtk_fixed_clk *clks,
>  }
>  EXPORT_SYMBOL_GPL(mtk_clk_register_fixed_clks);
>  
> +void mtk_clk_unregister_fixed_clks(const struct mtk_fixed_clk *clks,
> int num,
> +				   struct clk_onecell_data *clk_data)
> +{
> +	int i;
> +
> +	if (!clk_data)
> +		return;
> +
> +	for (i = num; i > 0; i--) {
> +		const struct mtk_fixed_clk *rc = &clks[i - 1];
> +
> +		if (IS_ERR_OR_NULL(clk_data->clks[rc->id]))
> +			continue;
> +
> +		clk_unregister_fixed_rate(clk_data->clks[rc->id]);
> +		clk_data->clks[rc->id] = ERR_PTR(-ENOENT);
> +	}
> +}
> +EXPORT_SYMBOL_GPL(mtk_clk_unregister_fixed_clks);
> +
>  void mtk_clk_register_factors(const struct mtk_fixed_factor *clks,
>  		int num, struct clk_onecell_data *clk_data)
>  {
> diff --git a/drivers/clk/mediatek/clk-mtk.h
> b/drivers/clk/mediatek/clk-mtk.h
> index 168220f85489..cc7f920eabb4 100644
> --- a/drivers/clk/mediatek/clk-mtk.h
> +++ b/drivers/clk/mediatek/clk-mtk.h
> @@ -34,8 +34,10 @@ struct mtk_fixed_clk {
>  		.rate = _rate,				\
>  	}
>  
> -void mtk_clk_register_fixed_clks(const struct mtk_fixed_clk *clks,
> -		int num, struct clk_onecell_data *clk_data);
> +void mtk_clk_register_fixed_clks(const struct mtk_fixed_clk *clks,
> int num,
> +				 struct clk_onecell_data *clk_data);
> +void mtk_clk_unregister_fixed_clks(const struct mtk_fixed_clk *clks,
> int num,
> +				   struct clk_onecell_data *clk_data);
>  
>  struct mtk_fixed_factor {
>  	int id;