[PATCH v2 1/2] clk: implement clk_get_optional helper

[Sascha Hauer]

On Wed, Sep 06, 2023 at 03:39:27PM +0200, Bastian Krause wrote:
> From: Ahmad Fatoum <a.fatoum at pengutronix.de>
> 
> Lack of clock can be ok at times and thus the clk API accepts NULL
> arguments and treats them as no-op.
> 
> Linux provides a clk_get_optional function to simplify code with such
> optional code, so let's provide an equivalent for barebox.
> 
> Signed-off-by: Ahmad Fatoum <a.fatoum at pengutronix.de>
> Reviewed-by: Marco Felsch <m.felsch at pengutronix.de>
> ---
> No changes since (implicit) v1.
> ---
>  include/linux/clk.h | 19 +++++++++++++++++++
>  1 file changed, 19 insertions(+)

Applied, thanks

Sascha

> 
> diff --git a/include/linux/clk.h b/include/linux/clk.h
> index 8509d5ece9d..82022e78e39 100644
> --- a/include/linux/clk.h
> +++ b/include/linux/clk.h
> @@ -932,4 +932,23 @@ static inline void clk_bulk_disable(int num_clks,
>  
>  #endif
>  
> +/**
> + * clk_get_optional - lookup and obtain a reference to an optional clock
> + *		      producer.
> + * @dev: device for clock "consumer"
> + * @id: clock consumer ID
> + *
> + * Behaves the same as clk_get() except where there is no clock producer. In
> + * this case, instead of returning -ENOENT, the function returns NULL.
> + */
> +static inline struct clk *clk_get_optional(struct device *dev, const char *id)
> +{
> +	struct clk *clk = clk_get(dev, id);
> +
> +	if (clk == ERR_PTR(-ENOENT))
> +		return NULL;
> +
> +	return clk;
> +}
> +
>  #endif
> -- 
> 2.39.2
> 
> 
> 

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