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

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Message-ID: <20131121151218.befbb483c0cf09cdcd4cd4dd@nvidia.com>
Date:	Thu, 21 Nov 2013 15:12:18 +0200
From:	Hiroshi Doyu <hdoyu@...dia.com>
To:	Grant Likely <grant.likely@...aro.org>
CC:	Stephen Warren <swarren@...dia.com>,
	"will.deacon@....com" <will.deacon@....com>,
	"thierry.reding@...il.com" <thierry.reding@...il.com>,
	"swarren@...dotorg.org" <swarren@...dotorg.org>,
	"galak@...eaurora.org" <galak@...eaurora.org>,
	"mark.rutland@....com" <mark.rutland@....com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"lorenzo.pieralisi@....com" <lorenzo.pieralisi@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCHv5 1/9] of: introduce
 of_property_for_earch_phandle_with_args()

On Thu, 21 Nov 2013 13:43:28 +0100
Grant Likely <grant.likely@...aro.org> wrote:

> 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.

The above can be:

"
  The following pattern of code is tempting to add a new member for
  of_property_for_each_*() family as an idiom.
  
    for (i = 0;
        !of_parse_phandle_with_args(np, list, cells, i, args); i++)
                  <do something with "args">;
"

Actual usage is here:

        int i;
        struct of_phandle_args args;

        of_property_for_each_phandle_with_args(dev->of_node, "iommus",
                                               "#iommu-cells", i, &args) {
                pr_debug("%s(i=%d) %s\n", __func__, i, dev_name(dev));

                if (!of_find_iommu_by_node(args.np))
                        return -EPROBE_DEFER;

Is this acceptable?
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