linux-kernel - Re: [PATCH] thermal: of: look for sensor driver parent node if device node missing

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Date:	Wed, 30 Jul 2014 09:18:46 -0400
From:	Eduardo Valentin <edubezval@...il.com>
To:	Lucas Stach <l.stach@...gutronix.de>
Cc:	Laxman Dewangan <ldewangan@...dia.com>, rui.zhang@...el.com,
	eduardo.valentin@...com, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] thermal: of: look for sensor driver parent node if
 device node missing

Laxman,

On Mon, Jul 14, 2014 at 02:04:55PM +0200, Lucas Stach wrote:
> Am Montag, den 14.07.2014, 16:42 +0530 schrieb Laxman Dewangan:
> > There are some mfd devices which supports junction thermal interrupt
> > like ams,AS3722. The DT binding of these devices are defined as the
> > flat and drivers for sub module of such devices are registered as
> > the mfd_add_devices. In this method, the sub devices registered as
> > platform driver and these do not have the of_node pointer on their
> > device structure. In this case, use the parent of_node pointer to
> > get the required of_node pointer.
> > 
> > Signed-off-by: Laxman Dewangan <ldewangan@...dia.com>
> > ---
> >  drivers/thermal/of-thermal.c | 2 ++
> >  1 file changed, 2 insertions(+)
> > 
> > diff --git a/drivers/thermal/of-thermal.c b/drivers/thermal/of-thermal.c
> > index 04b1be7..85a7d71 100644
> > --- a/drivers/thermal/of-thermal.c
> > +++ b/drivers/thermal/of-thermal.c
> > @@ -396,6 +396,8 @@ thermal_zone_of_sensor_register(struct device *dev, int sensor_id,
> >  		return ERR_PTR(-EINVAL);
> >  
> >  	sensor_np = dev->of_node;
> > +	if (!sensor_np && dev->parent)
> > +		sensor_np = dev->parent->of_node;
> >  
> >  	for_each_child_of_node(np, child) {
> >  		struct of_phandle_args sensor_specs;
> 
> This seems like the wrong way around. If the MFD has subdev information
> stored in the parent node it should be the MFD drivers responsibility to
> populate the subdev of_node with its own node. The subdev should not be
> forced to make such possible unsafe assumptions.
> 

This is my understanding too. MFD device drivers must populate the
required data onto their sub devices while creating them.

> Regards,
> Lucas
> -- 
> Pengutronix e.K.             | Lucas Stach                 |
> Industrial Linux Solutions   | http://www.pengutronix.de/  |
> 
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