linux-kernel - Re: [PATCH] of: Introduce of_node_get_match

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Message-ID: <7ff6bd21-19f0-7e0c-18bf-e835e7d4319e@mentor.com>
Date:   Fri, 9 Jun 2017 10:30:00 +0300
From:   Vladimir Zapolskiy <vladimir_zapolskiy@...tor.com>
To:     Geert Uytterhoeven <geert+renesas@...der.be>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>
CC:     <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] of: Introduce of_node_get_match_data() helper

Hello Geert,

On 04/25/2017 08:40 PM, Geert Uytterhoeven wrote:
> If CONFIG_OF=n, code using
> 
>     info = of_match_node(matchs, np)->data;
> 
> fails to compile:
> 
>     warning: dereferencing ‘void *’ pointer
>     error: request for member ‘data’ in something not a structure or union

IMHO firstly all the cases like one above must be fixed in place, in
parallel do an overall conversion of subcases:

-	of_id = of_match_node(some_dt_ids, dev->of_node);
+	of_id = of_match_device(some_dt_ids, dev);

> Follow the example set by of_device_get_match_data(), and introduce a
> new helper of_node_get_match_data().  This will allow to increase
> compile-testing coverage later.

Unfortunately the proposed of_node_get_match_data() is not so similar
to the of_device_get_match_data(), the latter one has only one input
argument in opposite to of_match_device(), which is truly convenient.

> Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>

The change itself is good.

Reviewed-by: Vladimir Zapolskiy <vladimir_zapolskiy@...tor.com>

--
With best wishes,
Vladimir