linux-kernel - Re: [PATCH 1/3] of: Add of_match

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Date:	Fri, 8 Aug 2014 11:41:25 +0200
From:	Thierry Reding <thierry.reding@...il.com>
To:	Tuomas Tynkkynen <ttynkkynen@...dia.com>
Cc:	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Stephen Warren <swarren@...dotorg.org>,
	linux-pm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	linux-tegra@...r.kernel.org,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Subject: Re: [PATCH 1/3] of: Add of_match_machine helper

On Fri, Aug 08, 2014 at 02:01:53AM +0300, Tuomas Tynkkynen wrote:
> Add of_match_machine function to test the device tree root for an
> of_match array. This can be useful when testing SoC versions at runtime,
> for example.
> 
> Signed-off-by: Tuomas Tynkkynen <ttynkkynen@...dia.com>
> ---
>  drivers/of/base.c  | 21 +++++++++++++++++++++
>  include/linux/of.h |  3 +++
>  2 files changed, 24 insertions(+)
> 
> diff --git a/drivers/of/base.c b/drivers/of/base.c
> index d8574ad..37798ea 100644
> --- a/drivers/of/base.c
> +++ b/drivers/of/base.c
> @@ -977,6 +977,27 @@ struct device_node *of_find_matching_node_and_match(struct device_node *from,
>  EXPORT_SYMBOL(of_find_matching_node_and_match);
>  
>  /**
> + * of_match_machine - Tell if root of device tree has a matching of_match struct
> + *	@matches:	array of of device match structures to search in
> + *
> + *	Returns the result of of_match_node for the root node.
> + */

I was going to say that this kerneldoc is weirdly formatted, but when I
looked at the other kerneldoc comments in this file it seems that they
use similarly weird formatting...

> +const struct of_device_id *of_match_machine(const struct of_device_id *matches)
> +{
> +	const struct of_device_id *match;
> +	struct device_node *root;
> +
> +	root = of_find_node_by_path("/");
> +	if (!root)
> +		return NULL;
> +
> +	match = of_match_node(matches, root);
> +	of_node_put(root);
> +	return match;
> +}
> +EXPORT_SYMBOL(of_match_machine);

I wonder if of_find_node_by_path("/") is somewhat overkill here. Perhaps
simply of_node_get(of_allnodes) would be more appropriate here since the
function is implemented in the core?

Thierry

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