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

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Date:   Mon, 15 Jul 2019 17:25:19 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Marc Gonzalez <marc.w.gonzalez@...e.fr>,
        Stephen Boyd <sboyd@...nel.org>,
        Michael Turquette <mturquette@...libre.com>
Cc:     linux-clk <linux-clk@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Jonathan Neuschäfer <j.neuschaefer@....net>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>
Subject: Re: [PATCH v1] clk: Add devm_clk_{prepare,enable,prepare_enable}

On 7/15/19 8:34 AM, 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>

Again ?

https://lore.kernel.org/patchwork/patch/755667/

This must be at least the third time this is tried. I don't think anything changed
since the previous submissions. I long since gave up and use devm_add_action_or_reset()
in affected drivers instead.

Guenter

> ---
>   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)
>   {
>