linux-kernel - Re: [PATCH v3 13/13] thermal: qoriq: Add hwmon support

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Date:   Fri, 5 Apr 2019 11:38:00 -0700
From:   Andrey Smirnov <andrew.smirnov@...il.com>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>
Cc:     linux-pm@...r.kernel.org, Chris Healy <cphealy@...il.com>,
        Lucas Stach <l.stach@...gutronix.de>,
        Eduardo Valentin <edubezval@...il.com>,
        Angus Ainslie <angus@...ea.ca>,
        dl-linux-imx <linux-imx@....com>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 13/13] thermal: qoriq: Add hwmon support

On Thu, Apr 4, 2019 at 2:12 AM Daniel Lezcano <daniel.lezcano@...aro.org> wrote:
>
> On 01/04/2019 06:14, Andrey Smirnov wrote:
> > Expose thermal readings as a HWMON device, so that it could be
> > accessed using lm-sensors.
> >
> > Signed-off-by: Andrey Smirnov <andrew.smirnov@...il.com>
> > Cc: Chris Healy <cphealy@...il.com>
> > Cc: Lucas Stach <l.stach@...gutronix.de>
> > Cc: Zhang Rui <rui.zhang@...el.com>
> > Cc: Eduardo Valentin <edubezval@...il.com>
> > Cc: Daniel Lezcano <daniel.lezcano@...aro.org>
> > Cc: Angus Ainslie (Purism) <angus@...ea.ca>
> > Cc: linux-imx@....com
> > Cc: linux-pm@...r.kernel.org
> > Cc: linux-kernel@...r.kernel.org
> > ---
> >  drivers/thermal/qoriq_thermal.c | 6 +++++-
> >  1 file changed, 5 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/thermal/qoriq_thermal.c b/drivers/thermal/qoriq_thermal.c
> > index 9d227654f879..7fb9321a0d8c 100644
> > --- a/drivers/thermal/qoriq_thermal.c
> > +++ b/drivers/thermal/qoriq_thermal.c
> > @@ -12,6 +12,7 @@
> >  #include <linux/thermal.h>
> >
> >  #include "thermal_core.h"
> > +#include "thermal_hwmon.h"
> >
> >  #define SITES_MAX    16
> >
> > @@ -103,7 +104,10 @@ static int qoriq_tmu_register_tmu_zone(struct device *dev,
> >               case -ENODEV:
> >                       continue;
> >               case 0:
> > -                     break;
> > +                     ret = devm_thermal_add_hwmon_sysfs(tzd);
> > +                     if (!ret)
> > +                             break;
> > +                     /* fallthrough */
>
> Do we really want to disable the thermal zone if the hwmon fails to
> register ?

Original code already disables all thermal zones if any single one
fails to register, so I though we may as well be as strict for hwmon
registration as well. Doesn't have to be though. Will change in v4.

Thanks,
Andrey Smirnov