Re: [PATCH v3 09/31] clk: mediatek: mux: Implement unregister API

[Chun-Jie Chen]

On Tue, 2022-02-08 at 20:40 +0800, Chen-Yu Tsai wrote:
> The mux clk type within the MediaTek clk driver library only has a
> register function, and no corresponding unregister function. This
> means there is no way for its users to properly implement cleanup
> and removal.
> 
> Add a matching unregister function for the mux type clk.
> 
> Signed-off-by: Chen-Yu Tsai <wenst@xxxxxxxxxxxx>
> Reviewed-by: Miles Chen <miles.chen@xxxxxxxxxxxx>
> Reviewed-by: AngeloGioacchino Del Regno <
> angelogioacchino.delregno@xxxxxxxxxxxxx>

Reviewed-by: Chun-Jie Chen <chun-jie.chen@xxxxxxxxxxxx>
> ---
>  drivers/clk/mediatek/clk-mux.c | 35
> ++++++++++++++++++++++++++++++++++
>  drivers/clk/mediatek/clk-mux.h |  3 +++
>  2 files changed, 38 insertions(+)
> 
> diff --git a/drivers/clk/mediatek/clk-mux.c
> b/drivers/clk/mediatek/clk-mux.c
> index 89f23e111d91..6f0c22a699c3 100644
> --- a/drivers/clk/mediatek/clk-mux.c
> +++ b/drivers/clk/mediatek/clk-mux.c
> @@ -164,6 +164,21 @@ static struct clk *mtk_clk_register_mux(const
> struct mtk_mux *mux,
>  	return clk;
>  }
>  
> +static void mtk_clk_unregister_mux(struct clk *clk)
> +{
> +	struct mtk_clk_mux *mux;
> +	struct clk_hw *hw;
> +
> +	hw = __clk_get_hw(clk);
> +	if (!hw)
> +		return;
> +
> +	mux = to_mtk_clk_mux(hw);
> +
> +	clk_unregister(clk);
> +	kfree(mux);
> +}
> +
>  int mtk_clk_register_muxes(const struct mtk_mux *muxes,
>  			   int num, struct device_node *node,
>  			   spinlock_t *lock,
> @@ -198,4 +213,24 @@ int mtk_clk_register_muxes(const struct mtk_mux
> *muxes,
>  }
>  EXPORT_SYMBOL_GPL(mtk_clk_register_muxes);
>  
> +void mtk_clk_unregister_muxes(const struct mtk_mux *muxes, int num,
> +			      struct clk_onecell_data *clk_data)
> +{
> +	int i;
> +
> +	if (!clk_data)
> +		return;
> +
> +	for (i = num; i > 0; i--) {
> +		const struct mtk_mux *mux = &muxes[i - 1];
> +
> +		if (IS_ERR_OR_NULL(clk_data->clks[mux->id]))
> +			continue;
> +
> +		mtk_clk_unregister_mux(clk_data->clks[mux->id]);
> +		clk_data->clks[mux->id] = ERR_PTR(-ENOENT);
> +	}
> +}
> +EXPORT_SYMBOL_GPL(mtk_clk_unregister_muxes);
> +
>  MODULE_LICENSE("GPL");
> diff --git a/drivers/clk/mediatek/clk-mux.h
> b/drivers/clk/mediatek/clk-mux.h
> index 27841d649118..cb2ac4f04c58 100644
> --- a/drivers/clk/mediatek/clk-mux.h
> +++ b/drivers/clk/mediatek/clk-mux.h
> @@ -88,4 +88,7 @@ int mtk_clk_register_muxes(const struct mtk_mux
> *muxes,
>  			   spinlock_t *lock,
>  			   struct clk_onecell_data *clk_data);
>  
> +void mtk_clk_unregister_muxes(const struct mtk_mux *muxes, int num,
> +			      struct clk_onecell_data *clk_data);
> +
>  #endif /* __DRV_CLK_MTK_MUX_H */