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

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Message-Id: <20140817153146.1D611C40F4B@trevor.secretlab.ca>
Date:	Sun, 17 Aug 2014 16:31:46 +0100
From:	Grant Likely <grant.likely@...aro.org>
To:	Rob Herring <robherring2@...il.com>,
	Tuomas Tynkkynen <ttynkkynen@...dia.com>
Cc:	Thierry Reding <thierry.reding@...il.com>,
	Rob Herring <robh+dt@...nel.org>,
	Stephen Warren <swarren@...dotorg.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-tegra@...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, 8 Aug 2014 14:01:57 -0500, Rob Herring <robherring2@...il.com> wrote:
> On Fri, Aug 8, 2014 at 8:23 AM, Tuomas Tynkkynen <ttynkkynen@...dia.com> wrote:
> >
> >
> > On 08/08/14 12:41, Thierry Reding wrote:
> >>
> >>> +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?
> >
> > of_machine_is_compatible() uses of_find_node_by_path("/") as well, of_allnodes
> > seems to be only used when during iterating. So I'd prefer to have them
> > consistent.
> 
> Agreed.

Disagreed. of_machine_is_compatible should be simplified.

g.
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