linux-kernel - Re: [PATCH v2] clkdev: add devm_of_clk

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Date:	Wed, 06 Jul 2016 17:43:11 -0700
From:	Michael Turquette <mturquette@...libre.com>
To:	Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
	"Russell King" <linux@...linux.org.uk>,
	"Rob Herring" <robh@...nel.org>, "Mark Brown" <broonie@...nel.org>
Cc:	"Linux-Kernel" <linux-kernel@...r.kernel.org>,
	"Linux-DT" <devicetree@...r.kernel.org>,
	"Linux-ARM" <linux-arm-kernel@...ts.infradead.org>,
	"Linux-ALSA" <alsa-devel@...a-project.org>,
	linux-clk@...r.kernel.org
Subject: Re: [PATCH v2] clkdev: add devm_of_clk_get()

Quoting Kuninori Morimoto (2016-07-03 18:36:50)
> +struct clk *devm_of_clk_get(struct device *dev,
> +                           struct device_node *np, int index)

Any reason not to use devm_clk_get? Why do we need this helper?

Thanks,
Mike

> +{
> +       struct clk **ptr, *clk;
> +
> +       ptr = devres_alloc(devm_of_clk_release, sizeof(*ptr), GFP_KERNEL);
> +       if (!ptr)
> +               return ERR_PTR(-ENOMEM);
> +
> +       clk = of_clk_get(np, index);
> +       if (!IS_ERR(clk)) {
> +               *ptr = clk;
> +               devres_add(dev, ptr);
> +       } else {
> +               devres_free(ptr);
> +       }
> +
> +       return clk;
> +}
> +EXPORT_SYMBOL(devm_of_clk_get);
> +
>  static struct clk *__of_clk_get_by_name(struct device_node *np,
>                                         const char *dev_id,
>                                         const char *name)
> diff --git a/include/linux/clk.h b/include/linux/clk.h
> index a89ba4e..33cd540 100644
> --- a/include/linux/clk.h
> +++ b/include/linux/clk.h
> @@ -502,6 +502,8 @@ struct of_phandle_args;
>  
>  #if defined(CONFIG_OF) && defined(CONFIG_COMMON_CLK)
>  struct clk *of_clk_get(struct device_node *np, int index);
> +struct clk *devm_of_clk_get(struct device *dev,
> +                           struct device_node *np, int index);
>  struct clk *of_clk_get_by_name(struct device_node *np, const char *name);
>  struct clk *of_clk_get_from_provider(struct of_phandle_args *clkspec);
>  #else
> @@ -509,6 +511,11 @@ static inline struct clk *of_clk_get(struct device_node *np, int index)
>  {
>         return ERR_PTR(-ENOENT);
>  }
> +static inline struct clk *devm_of_clk_get(struct device *dev,
> +                           struct device_node *np, int index)
> +{
> +       return ERR_PTR(-ENOENT);
> +}
>  static inline struct clk *of_clk_get_by_name(struct device_node *np,
>                                              const char *name)
>  {
> -- 
> 1.9.1
>