linux-kernel - Re: [PATCH 18/31] clk: mediatek: Implement mtk_clk_unregister

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Date:   Wed, 26 Jan 2022 15:06:09 +0800
From:   Miles Chen <miles.chen@...iatek.com>
To:     <wenst@...omium.org>
CC:     <chun-jie.chen@...iatek.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-clk@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-mediatek@...ts.infradead.org>, <matthias.bgg@...il.com>,
        <mturquette@...libre.com>, <sboyd@...nel.org>
Subject: Re: [PATCH 18/31] clk: mediatek: Implement mtk_clk_unregister_composites() API

> mtk_clk_register_composites(), as the name suggests, is used to register
> a given list of composite 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>
> ---
>  drivers/clk/mediatek/clk-mtk.c | 41 ++++++++++++++++++++++++++++++++++
>  drivers/clk/mediatek/clk-mtk.h |  2 ++
>  2 files changed, 43 insertions(+)
> 
> diff --git a/drivers/clk/mediatek/clk-mtk.c b/drivers/clk/mediatek/clk-mtk.c
> index 3a6dfe445e63..2150ed8678e0 100644
> --- a/drivers/clk/mediatek/clk-mtk.c
> +++ b/drivers/clk/mediatek/clk-mtk.c
> @@ -233,6 +233,27 @@ struct clk *mtk_clk_register_composite(const struct mtk_composite *mc,
>  	return ERR_PTR(ret);
>  }
>  
> +static void mtk_clk_unregister_composite(struct clk *clk)
> +{
> +	struct clk_hw *hw = __clk_get_hw(clk);
> +	struct clk_composite *composite = to_clk_composite(hw);
> +	struct clk_mux *mux = NULL;
> +	struct clk_gate *gate = NULL;
> +	struct clk_divider *div = NULL;

Like mtk_clk_unregister_pll(clk), let's check !hw for consistency
of clk unregister functions.

thanks,
Miles
> +
> +	if (composite->mux_hw)
> +		mux = to_clk_mux(composite->mux_hw);
> +	if (composite->gate_hw)
> +		gate = to_clk_gate(composite->gate_hw);
> +	if (composite->rate_hw)
> +		div = to_clk_divider(composite->rate_hw);
> +
> +	clk_unregister_composite(clk);
> +	kfree(div);
> +	kfree(gate);
> +	kfree(mux);
> +}
> +
>  void mtk_clk_register_composites(const struct mtk_composite *mcs,
>  		int num, void __iomem *base, spinlock_t *lock,
>  		struct clk_onecell_data *clk_data)
> @@ -259,6 +280,26 @@ void mtk_clk_register_composites(const struct mtk_composite *mcs,
>  }
>  EXPORT_SYMBOL_GPL(mtk_clk_register_composites);
>  
> +void mtk_clk_unregister_composites(const struct mtk_composite *mcs, int num,
> +				   struct clk_onecell_data *clk_data)
> +{
> +	int i;
> +
> +	if (!clk_data)
> +		return;
> +
> +	for (i = num; i > 0; i--) {
> +		const struct mtk_composite *mc = &mcs[i - 1];
> +
> +		if (IS_ERR_OR_NULL(clk_data->clks[mc->id]))
> +			continue;
> +
> +		mtk_clk_unregister_composite(clk_data->clks[mc->id]);
> +		clk_data->clks[mc->id] = ERR_PTR(-ENOENT);
> +	}
> +}
> +EXPORT_SYMBOL_GPL(mtk_clk_unregister_composites);
> +
>  void mtk_clk_register_dividers(const struct mtk_clk_divider *mcds,
>  			int num, void __iomem *base, spinlock_t *lock,
>  				struct clk_onecell_data *clk_data)
> diff --git a/drivers/clk/mediatek/clk-mtk.h b/drivers/clk/mediatek/clk-mtk.h
> index e3ae22fb0334..3c3a934f53cd 100644
> --- a/drivers/clk/mediatek/clk-mtk.h
> +++ b/drivers/clk/mediatek/clk-mtk.h
> @@ -153,6 +153,8 @@ struct clk *mtk_clk_register_composite(const struct mtk_composite *mc,
>  void mtk_clk_register_composites(const struct mtk_composite *mcs,
>  		int num, void __iomem *base, spinlock_t *lock,
>  		struct clk_onecell_data *clk_data);
> +void mtk_clk_unregister_composites(const struct mtk_composite *mcs, int num,
> +				   struct clk_onecell_data *clk_data);
>  
>  struct mtk_clk_divider {
>  	int id;
> -- 
> 2.35.0.rc0.227.g00780c9af4-goog