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

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Date:	Mon, 14 Jul 2014 14:04:55 +0200
From:	Lucas Stach <l.stach@...gutronix.de>
To:	Laxman Dewangan <ldewangan@...dia.com>
Cc:	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

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.

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

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