linux-kernel - Re: lm-senser can't detect thermal on thermal

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Date:	Fri, 13 May 2016 02:04:47 +0000
From:	Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
To:	"Zhang, Rui" <rui.zhang@...el.com>
CC:	"edubezval@...il.com" <edubezval@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-renesas-soc@...r.kernel.org" 
	<linux-renesas-soc@...r.kernel.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"yoshihiro.shimoda.uh@...esas.com" <yoshihiro.shimoda.uh@...esas.com>,
	"cm-hiep@...so.co.jp" <cm-hiep@...so.co.jp>
Subject: Re: lm-senser can't detect thermal on thermal_zone


Hi Zhang

Thank you for your help

> > 	non thermal-zon
> > 	  sensor command: OK
> > 	  read from /sys/class/thermal/thermal_zone0 : OK
> > 
> > 	thermal-zon
> > 	  sensor command: NG
> > 	  read from /sys/class/thermal/thermal_zone0 : OK
> 
> config THERMAL_HWMON
>         bool
>         prompt "Expose thermal sensors as hwmon device"
>         depends on HWMON=y || HWMON=THERMAL
>         default y
> 
> please check if the thermal subsystem is built in, while hwmon subsystem
> is built as module.
> you should either set CONFIG_HWMON=y, or set both CONFIG_HWMON and
> CONFIG_THERMAL as module.

Thanks. but it seems our system has it.

I noticed that thermal_zone case uses of_parse_thermal_zones()
and it has this.

		/* No hwmon because there might be hwmon drivers registering */
		tzp->no_hwmon = true;

and on thermal_zone_device_register() check this for hwmon

struct thermal_zone_device *thermal_zone_device_register(xxxx)
{
	...
	if (!tz->tzp || !tz->tzp->no_hwmon) {
		result = thermal_add_hwmon_sysfs(tz);
		...
	}
	...
}

Does this mean "thermal_zone doesn't use lm-senser" ?