linux-kernel - Re: [PATCH v1] clk: Add devm_clk_{prepare,enable,prepare

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Message-ID: <34e32662-c909-9eb3-e561-3274ad0bf3cc@free.fr>
Date:   Mon, 25 Nov 2019 13:46:51 +0100
From:   Marc Gonzalez <marc.w.gonzalez@...e.fr>
To:     Stephen Boyd <sboyd@...nel.org>,
        Michael Turquette <mturquette@...libre.com>
Cc:     linux-clk <linux-clk@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v1] clk: Add devm_clk_{prepare,enable,prepare_enable}

On 15/07/2019 17:34, Marc Gonzalez wrote:

> Provide devm variants for automatic resource release on device removal.
> probe() error-handling is simpler, and remove is no longer required.
> 
> Signed-off-by: Marc Gonzalez <marc.w.gonzalez@...e.fr>
> ---
>  Documentation/driver-model/devres.rst |  3 +++
>  drivers/clk/clk.c                     | 24 ++++++++++++++++++++++++
>  include/linux/clk.h                   |  8 ++++++++
>  3 files changed, 35 insertions(+)
> 
> diff --git a/Documentation/driver-model/devres.rst b/Documentation/driver-model/devres.rst
> index 1b6ced8e4294..9357260576ef 100644
> --- a/Documentation/driver-model/devres.rst
> +++ b/Documentation/driver-model/devres.rst
> @@ -253,6 +253,9 @@ CLOCK
>    devm_clk_hw_register()
>    devm_of_clk_add_hw_provider()
>    devm_clk_hw_register_clkdev()
> +  devm_clk_prepare()
> +  devm_clk_enable()
> +  devm_clk_prepare_enable()
>  
>  DMA
>    dmaenginem_async_device_register()
> diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
> index c0990703ce54..5e85548357c0 100644
> --- a/drivers/clk/clk.c
> +++ b/drivers/clk/clk.c
> @@ -914,6 +914,18 @@ int clk_prepare(struct clk *clk)
>  }
>  EXPORT_SYMBOL_GPL(clk_prepare);
>  
> +static void unprepare(void *clk)
> +{
> +	clk_unprepare(clk);
> +}
> +
> +int devm_clk_prepare(struct device *dev, struct clk *clk)
> +{
> +	int rc = clk_prepare(clk);
> +	return rc ? : devm_add_action_or_reset(dev, unprepare, clk);
> +}
> +EXPORT_SYMBOL_GPL(devm_clk_prepare);
> +
>  static void clk_core_disable(struct clk_core *core)
>  {
>  	lockdep_assert_held(&enable_lock);
> @@ -1136,6 +1148,18 @@ int clk_enable(struct clk *clk)
>  }
>  EXPORT_SYMBOL_GPL(clk_enable);
>  
> +static void disable(void *clk)
> +{
> +	clk_disable(clk);
> +}
> +
> +int devm_clk_enable(struct device *dev, struct clk *clk)
> +{
> +	int rc = clk_enable(clk);
> +	return rc ? : devm_add_action_or_reset(dev, disable, clk);
> +}
> +EXPORT_SYMBOL_GPL(devm_clk_enable);
> +
>  static int clk_core_prepare_enable(struct clk_core *core)
>  {
>  	int ret;
> diff --git a/include/linux/clk.h b/include/linux/clk.h
> index 3c096c7a51dc..d09b5207e3f1 100644
> --- a/include/linux/clk.h
> +++ b/include/linux/clk.h
> @@ -895,6 +895,14 @@ static inline void clk_restore_context(void) {}
>  
>  #endif
>  
> +int devm_clk_prepare(struct device *dev, struct clk *clk);
> +int devm_clk_enable(struct device *dev, struct clk *clk);
> +static inline int devm_clk_prepare_enable(struct device *dev, struct clk *clk)
> +{
> +	int rc = devm_clk_prepare(dev, clk);
> +	return rc ? : devm_clk_enable(dev, clk);
> +}
> +
>  /* clk_prepare_enable helps cases using clk_enable in non-atomic context. */
>  static inline int clk_prepare_enable(struct clk *clk)
>  {

Thoughts? Comments?

Regards.