linux-kernel - Re: [PATCH v4 7/8] hwmon: pwm-fan: Read PWM FAN configuration from device tree

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Date:	Mon, 23 Feb 2015 08:23:05 -0800
From:	Guenter Roeck <linux@...ck-us.net>
To:	Lukasz Majewski <l.majewski@...sung.com>
Cc:	Eduardo Valentin <edubezval@...il.com>,
	Kamil Debski <k.debski@...sung.com>,
	Jean Delvare <jdelvare@...e.de>, Kukjin Kim <kgene@...nel.org>,
	lm-sensors@...sensors.org,
	Linux PM list <linux-pm@...r.kernel.org>,
	"linux-samsung-soc@...r.kernel.org" 
	<linux-samsung-soc@...r.kernel.org>, devicetree@...r.kernel.org,
	Lukasz Majewski <l.majewski@...ess.pl>,
	Kukjin Kim <kgene.kim@...sung.com>,
	linux-kernel@...r.kernel.org,
	Sjoerd Simons <sjoerd.simons@...labora.co.uk>,
	Abhilash Kesavan <kesavan.abhilash@...il.com>,
	Abhilash Kesavan <a.kesavan@...sung.com>
Subject: Re: [PATCH v4 7/8] hwmon: pwm-fan: Read PWM FAN configuration from
 device tree

On Mon, Feb 23, 2015 at 05:13:36PM +0100, Lukasz Majewski wrote:
> Hi Guenter,
> 
[ ... ]

> > 
> > If devicetree is not configured, of_property_count_elems_of_size
> > returns -ENOSYS, which is returned, causing the driver to fail
> > loading.
> 
> Has of_property_count_elems_of_size() returns -ENOSYS?
> 
> Maybe something has changed, but in my linux-vanila (3.19-rc4)
> at ./drivers/of/base.c it returns -EINVAL, -ENODATA or number of
> elements.
> 
> Have I missed something?
> 
Hi Lukasz,

Yes, you have. Check include/linux/of.h, line 484, in latest mainline.

Guenter
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