From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stephen Warren <swarren-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
Subject: Re: [PATCH v5 09/16] pwm: tegra: Add device tree support
Date: Mon, 02 Apr 2012 09:42:12 -0600
Message-ID: <4F79C8D4.2000306@wwwdotorg.org>
References: <1332945238-14897-1-git-send-email-thierry.reding@avionic-design.de> <1332945238-14897-10-git-send-email-thierry.reding@avionic-design.de> <4F7602CD.2010808@wwwdotorg.org> <20120402083749.GA6576@avionic-0098.adnet.avionic-design.de>
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit
Return-path: <linux-tegra-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
In-Reply-To: <20120402083749.GA6576-RM9K5IK7kjIyiCvfTdI0JKcOhU4Rzj621B7CTYaBSLdn68oJJulU0Q@public.gmane.org>
Sender: linux-tegra-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
To: Thierry Reding <thierry.reding-RM9K5IK7kjKj5M59NBduVrNAH6kLmebB@public.gmane.org>
Cc: devicetree-discuss-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Sascha Hauer <s.hauer-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>, Arnd Bergmann <arnd-r2nGTMty4D4@public.gmane.org>, Matthias Kaehlcke <matthias-RprLehDfhQ3k1uMJSBkQmQ@public.gmane.org>, Kurt Van Dijck <kurt.van.dijck-/BeEPy95v10@public.gmane.org>, Rob Herring <rob.herring-bsGFqQB8/DxBDgjK7y7TUQ@public.gmane.org>, Grant Likely <grant.likely-s3s/WqlpOiPyB63q8FvJNQ@public.gmane.org>, Colin Cross <ccross-z5hGa2qSFaRBDgjK7y7TUQ@public.gmane.org>, Olof Johansson <olof-nZhT3qVonbNeoWH0uzbU5w@public.gmane.org>, Richard Purdie <rpurdie-Fm38FmjxZ/leoWH0uzbU5w@public.gmane.org>, Mark Brown <broonie-yzvPICuk2AATkU/dhu1WVueM+bqZidxxQQ4Iyu8u01E@public.gmane.org>, Mitch Bradley <wmb-D5eQfiDGL7eakBO8gow8eQ@public.gmane.org>, Mike Frysinger <vapier-aBrp7R+bbdUdnm+yROfE0A@public.gmane.org>, Eric Miao <eric.y.miao-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>, Lars-Peter Clausen <lars-Qo5EllUWu/uELgA04lAiVw@public.gmane.org>, Ryan Mallon <rmallon-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>, Shawn Guo <shawn.guo-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>, Bernhard Walle <walle-pDveNdigDaDu9UdzE1sIFA@public.gmane.org>
List-Id: devicetree@vger.kernel.org

On 04/02/2012 02:37 AM, Thierry Reding wrote:
> * Stephen Warren wrote:
>> On 03/28/2012 08:33 AM, Thierry Reding wrote:
>>> Add auxdata to instantiate the PWFM controller from a device tree,
>>> include the corresponding nodes in the dtsi files for Tegra 20 and
>>> Tegra 30 and add binding documentation.
>>>
>>> Signed-off-by: Thierry Reding <thierry.reding-RM9K5IK7kjKj5M59NBduVrNAH6kLmebB@public.gmane.org>
>>> Acked-by: Stephen Warren <swarren-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
>>
>>> diff --git a/drivers/pwm/pwm-tegra.c b/drivers/pwm/pwm-tegra.c
>> ...
>>> +#ifdef CONFIG_OF
>>> +static struct of_device_id tegra_pwm_of_match[] = {
>>> +	{ .compatible = "nvidia,tegra20-pwm" },
>>> +	{ .compatible = "nvidia,tegra30-pwm" },
>>
>> Could you swap those two lines, so that tegra30-pwm matches first. It
>> makes no difference at present, but might in the future if the driver
>> actually has to differentiate the two SoCs.
> 
> I thought the matching order was determined by the compatible property in the
> device tree, not the OF match table of the driver.

At least logically, yes. However, of_match_device() appears to iterate
over each match table entry, checking whether it matches any string in
the compatible flag. Perhaps this could be considered a bug?