linux-kernel - Re: [PATCHv3] reset: add reset_control

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Date:	Thu, 23 Oct 2014 10:01:45 -0500
From:	Dinh Nguyen <dinguyen@...nsource.altera.com>
To:	<p.zabel@...gutronix.de>
CC:	<dinh.linux@...il.com>, <atull@...nsource.altera.com>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCHv3] reset: add reset_control_status helper function

Hi Philipp,

On 10/10/2014 10:21 AM, dinguyen@...nsource.altera.com wrote:
> From: Dinh Nguyen <dinguyen@...nsource.altera.com>
> 
> There are cases where a system will want to read a reset status bit before
> doing any other toggling. Add a reset_control_status helper function to the
> reset controller API.
> 
> Signed-off-by: Dinh Nguyen <dinguyen@...nsource.altera.com>
> ---
> v3: Remove last unsigned int and update comment
> v2: reset_control_status should be returning an int, and add a comment about
>     status in reset-controller.h
> ---
>  drivers/reset/core.c             | 15 +++++++++++++++
>  include/linux/reset-controller.h |  2 ++
>  include/linux/reset.h            |  7 +++++++
>  3 files changed, 24 insertions(+)
> 
> diff --git a/drivers/reset/core.c b/drivers/reset/core.c
> index baeaf82..7955e00 100644
> --- a/drivers/reset/core.c
> +++ b/drivers/reset/core.c
> @@ -126,6 +126,21 @@ int reset_control_deassert(struct reset_control *rstc)
>  EXPORT_SYMBOL_GPL(reset_control_deassert);
>  
>  /**
> + * reset_control_status - returns a negative errno if not supported, a
> + * positive value if the reset line is asserted, or zero if the reset
> + * line is not asserted.
> + * @rstc: reset controller
> + */
> +int reset_control_status(struct reset_control *rstc)
> +{
> +	if (rstc->rcdev->ops->status)
> +		return rstc->rcdev->ops->status(rstc->rcdev, rstc->id);
> +
> +	return -ENOSYS;
> +}
> +EXPORT_SYMBOL_GPL(reset_control_status);
> +
> +/**
>   * of_reset_control_get - Lookup and obtain a reference to a reset controller.
>   * @node: device to be reset by the controller
>   * @id: reset line name
> diff --git a/include/linux/reset-controller.h b/include/linux/reset-controller.h
> index 41a4695..ce6b962 100644
> --- a/include/linux/reset-controller.h
> +++ b/include/linux/reset-controller.h
> @@ -12,11 +12,13 @@ struct reset_controller_dev;
>   *         things to reset the device
>   * @assert: manually assert the reset line, if supported
>   * @deassert: manually deassert the reset line, if supported
> + * @status: return the status of the reset line, if supported
>   */
>  struct reset_control_ops {
>  	int (*reset)(struct reset_controller_dev *rcdev, unsigned long id);
>  	int (*assert)(struct reset_controller_dev *rcdev, unsigned long id);
>  	int (*deassert)(struct reset_controller_dev *rcdev, unsigned long id);
> +	int (*status)(struct reset_controller_dev *rcdev, unsigned long id);
>  };
>  
>  struct module;
> diff --git a/include/linux/reset.h b/include/linux/reset.h
> index 349f150..da5602b 100644
> --- a/include/linux/reset.h
> +++ b/include/linux/reset.h
> @@ -10,6 +10,7 @@ struct reset_control;
>  int reset_control_reset(struct reset_control *rstc);
>  int reset_control_assert(struct reset_control *rstc);
>  int reset_control_deassert(struct reset_control *rstc);
> +int reset_control_status(struct reset_control *rstc);
>  
>  struct reset_control *reset_control_get(struct device *dev, const char *id);
>  void reset_control_put(struct reset_control *rstc);
> @@ -57,6 +58,12 @@ static inline int reset_control_deassert(struct reset_control *rstc)
>  	return 0;
>  }
>  
> +static inline int reset_control_status(struct reset_control *rstc)
> +{
> +	WARN_ON(1);
> +	return 0;
> +}
> +
>  static inline void reset_control_put(struct reset_control *rstc)
>  {
>  	WARN_ON(1);
> 

Do you have any further comments on this version of that patch? If not,
can I get an Ack-by?

Thanks,
Dinh
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