linux-kernel - Re: [RFC PATCH] reset: Add devm_reset_control

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Date: Tue, 14 May 2024 15:09:56 +0100
From: "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To: Geert Uytterhoeven <geert+renesas@...der.be>, Philipp Zabel <p.zabel@...gutronix.de>
Cc: linux-kernel@...r.kernel.org, linux-renesas-soc@...r.kernel.org, 
	Fabrizio Castro <fabrizio.castro.jz@...esas.com>, 
	Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: Re: [RFC PATCH] reset: Add devm_reset_control_deassert helper

On Thu, Apr 18, 2024 at 2:26 PM Prabhakar <prabhakar.csengg@...il.com> wrote:
>
> From: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
>
> A typical code pattern for reset_control_deassert() call is to call it in
> the _probe function and to call reset_control_assert() both from _probe
> error path and from _remove function.
>
> Add helper function to replace this bolierplate piece of code. Calling
> devm_reset_control_deassert() removes the need for calling
> reset_control_assert() both in the probe()'s error path and in the
> remove() function.
>
> Suggested-by: Geert Uytterhoeven <geert+renesas@...der.be>
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> ---
>  drivers/reset/core.c  | 22 ++++++++++++++++++++++
>  include/linux/reset.h |  6 ++++++
>  2 files changed, 28 insertions(+)
>
Gentle ping.

Cheers,
Prabhakar

> diff --git a/drivers/reset/core.c b/drivers/reset/core.c
> index dba74e857be6..a2a6eff8e599 100644
> --- a/drivers/reset/core.c
> +++ b/drivers/reset/core.c
> @@ -592,6 +592,28 @@ int reset_control_deassert(struct reset_control *rstc)
>  }
>  EXPORT_SYMBOL_GPL(reset_control_deassert);
>
> +static void reset_control_assert_action(void *rstc)
> +{
> +       reset_control_assert(rstc);
> +}
> +
> +/**
> + * devm_reset_control_deassert - devres-enabled version of reset_control_deassert()
> + * @dev: device that requests the reset control
> + * @rstc: reset controller
> + */
> +int devm_reset_control_deassert(struct device *dev, struct reset_control *rstc)
> +{
> +       int ret;
> +
> +       ret = reset_control_deassert(rstc);
> +       if (ret)
> +               return ret;
> +
> +       return devm_add_action_or_reset(dev, reset_control_assert_action, rstc);
> +}
> +EXPORT_SYMBOL_GPL(devm_reset_control_deassert);
> +
>  /**
>   * reset_control_bulk_deassert - deasserts the reset lines in reverse order
>   * @num_rstcs: number of entries in rstcs array
> diff --git a/include/linux/reset.h b/include/linux/reset.h
> index 514ddf003efc..e41e752ba098 100644
> --- a/include/linux/reset.h
> +++ b/include/linux/reset.h
> @@ -31,6 +31,7 @@ int reset_control_reset(struct reset_control *rstc);
>  int reset_control_rearm(struct reset_control *rstc);
>  int reset_control_assert(struct reset_control *rstc);
>  int reset_control_deassert(struct reset_control *rstc);
> +int devm_reset_control_deassert(struct device *dev, struct reset_control *rstc);
>  int reset_control_status(struct reset_control *rstc);
>  int reset_control_acquire(struct reset_control *rstc);
>  void reset_control_release(struct reset_control *rstc);
> @@ -91,6 +92,11 @@ static inline int reset_control_deassert(struct reset_control *rstc)
>         return 0;
>  }
>
> +static inline int devm_reset_control_deassert(struct device *dev, struct reset_control *rstc)
> +{
> +       return 0;
> +}
> +
>  static inline int reset_control_status(struct reset_control *rstc)
>  {
>         return 0;
> --
> 2.34.1
>