[PATCH v3 16/31] clk: mediatek: Implement mtk_clk_unregister_factors() API

[Chun-Jie Chen]

On Tue, 2022-02-08 at 20:40 +0800, Chen-Yu Tsai wrote:
> mtk_clk_register_factors(), as the name suggests, is used to register
> a given list of fixed factor 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 at chromium.org>
> Reviewed-by: Miles Chen <miles.chen at mediatek.com>
> Reviewed-by: AngeloGioacchino Del Regno <
> angelogioacchino.delregno at collabora.com>

Reviewed-by: Chun-Jie Chen <chun-jie.chen at mediatek.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 7c0d5706eed7..b267b2f04b84 100644
> --- a/drivers/clk/mediatek/clk-mtk.c
> +++ b/drivers/clk/mediatek/clk-mtk.c
> @@ -126,6 +126,26 @@ void mtk_clk_register_factors(const struct
> mtk_fixed_factor *clks,
>  }
>  EXPORT_SYMBOL_GPL(mtk_clk_register_factors);
>  
> +void mtk_clk_unregister_factors(const struct mtk_fixed_factor *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_factor *ff = &clks[i - 1];
> +
> +		if (IS_ERR_OR_NULL(clk_data->clks[ff->id]))
> +			continue;
> +
> +		clk_unregister_fixed_factor(clk_data->clks[ff->id]);
> +		clk_data->clks[ff->id] = ERR_PTR(-ENOENT);
> +	}
> +}
> +EXPORT_SYMBOL_GPL(mtk_clk_unregister_factors);
> +
>  struct clk *mtk_clk_register_composite(const struct mtk_composite
> *mc,
>  		void __iomem *base, spinlock_t *lock)
>  {
> diff --git a/drivers/clk/mediatek/clk-mtk.h
> b/drivers/clk/mediatek/clk-mtk.h
> index cc7f920eabb4..4db1a97c1250 100644
> --- a/drivers/clk/mediatek/clk-mtk.h
> +++ b/drivers/clk/mediatek/clk-mtk.h
> @@ -55,8 +55,10 @@ struct mtk_fixed_factor {
>  		.div = _div,				\
>  	}
>  
> -void mtk_clk_register_factors(const struct mtk_fixed_factor *clks,
> -		int num, struct clk_onecell_data *clk_data);
> +void mtk_clk_register_factors(const struct mtk_fixed_factor *clks,
> int num,
> +			      struct clk_onecell_data *clk_data);
> +void mtk_clk_unregister_factors(const struct mtk_fixed_factor *clks,
> int num,
> +				struct clk_onecell_data *clk_data);
>  
>  struct mtk_composite {
>  	int id;