linux-kernel - Re: [PATCH v2 01/17] reset: add of_reset_control_get_by

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Date:	Thu, 12 Mar 2015 16:01:44 +0100
From:	Philipp Zabel <p.zabel@...gutronix.de>
To:	Vince Hsu <vinceh@...dia.com>
Cc:	thierry.reding@...il.com, pdeschrijver@...dia.com,
	swarren@...dotorg.org, gnurou@...il.com, jroedel@...e.de,
	mturquette@...aro.org, pgaikwad@...dia.com, sboyd@...eaurora.org,
	robh+dt@...nel.org, pawel.moll@....com, mark.rutland@....com,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org,
	linux@....linux.org.uk, tbergstrom@...dia.com, airlied@...ux.ie,
	bhelgaas@...gle.com, tj@...nel.org, arnd@...db.de, robh@...nel.org,
	will.deacon@....com, linux-tegra@...r.kernel.org,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-pm@...r.kernel.org,
	rjw@...ysocki.net, viresh.kumar@...aro.org
Subject: Re: [PATCH v2 01/17] reset: add of_reset_control_get_by_index()

Hi Vince,

Am Donnerstag, den 12.03.2015, 20:15 +0800 schrieb Vince Hsu:
> Add of_reset_control_get_by_index() to allow the drivers to get reset device
> without knowing its name.

I see this is useful in the case of PM domain drivers that just need to
trigger a list of resets in whatever order.

> Signed-off-by: Vince Hsu <vinceh@...dia.com>
> 
> ---
> v2: minor changes according to Alex's comments
> 
>  drivers/reset/core.c  | 44 +++++++++++++++++++++++++++++---------------
>  include/linux/reset.h |  9 +++++++++
>  2 files changed, 38 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/reset/core.c b/drivers/reset/core.c
> index 7955e00d04d4..5e78866acd62 100644
> --- a/drivers/reset/core.c
> +++ b/drivers/reset/core.c
> @@ -140,28 +140,15 @@ int reset_control_status(struct reset_control *rstc)
>  }
>  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
> - *
> - * Returns a struct reset_control or IS_ERR() condition containing errno.
> - *
> - * Use of id names is optional.
> - */
> -struct reset_control *of_reset_control_get(struct device_node *node,
> -					   const char *id)
> +struct reset_control *__of_reset_control_get(struct device_node *node,
> +						int index)

static

>  {
>  	struct reset_control *rstc = ERR_PTR(-EPROBE_DEFER);
>  	struct reset_controller_dev *r, *rcdev;
>  	struct of_phandle_args args;
> -	int index = 0;
>  	int rstc_id;
>  	int ret;
>  
> -	if (id)
> -		index = of_property_match_string(node,
> -						 "reset-names", id);
>  	ret = of_parse_phandle_with_args(node, "resets", "#reset-cells",
>  					 index, &args);
>  	if (ret)
> @@ -202,6 +189,33 @@ struct reset_control *of_reset_control_get(struct device_node *node,
>  
>  	return rstc;
>  }
> +
> +struct reset_control *of_reset_control_get_by_index(struct device_node *node,
> +					   int index)
> +{
> +	return __of_reset_control_get(node, index);
> +}
> +EXPORT_SYMBOL_GPL(of_reset_control_get_by_index);

This function is missing a kerneldoc comment, and please add a note that
this is only to be used if the order of the resets doesn't matter.

Actually, I see no reason not to just merge __of_reset_control_get into
of_reset_control_get_by_index and then just call that from
of_reset_control_get.

> +/**
> + * 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
> + *
> + * Returns a struct reset_control or IS_ERR() condition containing errno.
> + *
> + * Use of id names is optional.
> + */
> +struct reset_control *of_reset_control_get(struct device_node *node,
> +					   const char *id)
> +{
> +	int index = 0;
> +
> +	if (id)
> +		index = of_property_match_string(node,
> +						 "reset-names", id);
> +	return __of_reset_control_get(node, index);
> +}
>  EXPORT_SYMBOL_GPL(of_reset_control_get);
[...]

regards
Philipp

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