linux-kernel - Re: [PATCHv5 1/9] of: introduce of_property_for_earch_phandle_with

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Date:	Thu, 21 Nov 2013 12:43:28 +0000
From:	Grant Likely <grant.likely@...aro.org>
To:	Hiroshi Doyu <hdoyu@...dia.com>, swarren@...dia.com,
	will.deacon@....com, thierry.reding@...il.com,
	swarren@...dotorg.org, galak@...eaurora.org
Cc:	Hiroshi Doyu <hdoyu@...dia.com>, mark.rutland@....com,
	devicetree@...r.kernel.org, iommu@...ts.linux-foundation.org,
	linux-tegra@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	lorenzo.pieralisi@....com, linux-kernel@...r.kernel.org
Subject: Re: [PATCHv5 1/9] of: introduce of_property_for_earch_phandle_with_args()

On Tue, 19 Nov 2013 11:33:05 +0200, Hiroshi Doyu <hdoyu@...dia.com> wrote:
> The following pattern of code is tempting:
> 
>   for (i = 0; !of_parse_phandle_with_args(np, list, cells, i, args); i++)
> 
> Signed-off-by: Hiroshi Doyu <hdoyu@...dia.com>

That's a very minimal commit message. Can you elaborate please.

> ---
> v5:
> New patch for v5.
> ---
>  include/linux/of.h | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/include/linux/of.h b/include/linux/of.h
> index 276c546..131fef5 100644
> --- a/include/linux/of.h
> +++ b/include/linux/of.h
> @@ -613,6 +613,9 @@ static inline int of_property_read_u32(const struct device_node *np,
>  		s;						\
>  		s = of_prop_next_string(prop, s))
>  
> +#define of_property_for_each_phandle_with_args(np, list, cells, i, args) \
> +	for (i = 0; !of_parse_phandle_with_args(np, list, cells, i, args); i++)
> +

That works, but pretty darn inefficient. We need an iterator version of
of_parse_phandle_with_args() to loop over all the entries.

>  #if defined(CONFIG_PROC_FS) && defined(CONFIG_PROC_DEVICETREE)
>  extern void proc_device_tree_add_node(struct device_node *, struct proc_dir_entry *);
>  extern void proc_device_tree_add_prop(struct proc_dir_entry *pde, struct property *prop);
> -- 
> 1.8.1.5
> 

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