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Message-id: <20141126093510.4233ff7f@amdc2363>
Date: Wed, 26 Nov 2014 09:35:10 +0100
From: Lukasz Majewski <l.majewski@...sung.com>
To: Eduardo Valentin <edubezval@...il.com>
Cc: Zhang Rui <rui.zhang@...el.com>,
Linux PM list <linux-pm@...r.kernel.org>,
Thierry Reding <thierry.reding@...il.com>,
Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
Lukasz Majewski <l.majewski@...ess.pl>,
Mikko Perttunen <mperttunen@...dia.com>,
Stephen Warren <swarren@...dotorg.org>,
Abhilash Kesavan <kesavan.abhilash@...il.com>,
Abhilash Kesavan <a.kesavan@...sung.com>,
Guenter Roeck <linux@...ck-us.net>,
linux-kernel@...r.kernel.org,
Caesar Wang <caesar.wang@...k-chips.com>
Subject: Re: [PATCH v2 3/4] thermal: of: Extend of-thermal to export table of
trip points
Hi Eduardo,
> Hello Lukasz,
>
> On Thu, Nov 20, 2014 at 05:21:27PM +0100, Lukasz Majewski wrote:
> > This patch extends the of-thermal.c to export copy of trip points
> > for a given thermal zone.
> >
> > Thermal drivers should use of_thermal_get_trip_points() method to
> > get pointer to table of thermal trip points.
> >
> > Signed-off-by: Lukasz Majewski <l.majewski@...sung.com>
> > ---
> > Changes for v2:
> > - New patch - as suggested by Eduardo Valentin
> > ---
> > drivers/thermal/of-thermal.c | 33
> > +++++++++++++++++++++++++++++++++ drivers/thermal/thermal_core.h |
> > 7 +++++++ include/linux/thermal.h | 14 ++++++++++++++
> > 3 files changed, 54 insertions(+)
> >
> > diff --git a/drivers/thermal/of-thermal.c
> > b/drivers/thermal/of-thermal.c index 336af7f..33921c5 100644
> > --- a/drivers/thermal/of-thermal.c
> > +++ b/drivers/thermal/of-thermal.c
> > @@ -89,6 +89,7 @@ struct __thermal_zone {
> > /* trip data */
> > int ntrips;
> > struct __thermal_trip *trips;
> > + struct thermal_trip *gtrips;
> >
> > /* cooling binding data */
> > int num_tbps;
> > @@ -152,6 +153,27 @@ bool of_thermal_is_trip_en(struct
> > thermal_zone_device *tz, int trip) return true;
> > }
> >
> > +/**
> > + * of_thermal_get_trip_points - function to get access to a
> > globally exported
> > + * trip points
> > + *
> > + * @tz: pointer to a thermal zone
> > + *
> > + * This function provides a pointer to the copy of trip points
> > table
> > + *
> > + * Return: pointer to trip points table, NULL otherwise
> > + */
> > +const struct thermal_trip * const
> > +of_thermal_get_trip_points(struct thermal_zone_device *tz)
> > +{
> > + struct __thermal_zone *data = tz->devdata;
> > +
> > + if (!data)
> > + return NULL;
> > +
> > + return data->gtrips;
> > +}
> > +
>
> EXPORT_SYMBOL_GPL(of_thermal_get_trip_points);
Ok.
>
> > static int of_thermal_get_trend(struct thermal_zone_device *tz,
> > int trip, enum thermal_trend *trend)
> > {
> > @@ -767,6 +789,16 @@ thermal_of_build_thermal_zone(struct
> > device_node *np) goto free_tbps;
> > }
> >
> > + tz->gtrips = kcalloc(tz->ntrips, sizeof(*tz->gtrips),
> > GFP_KERNEL);
> > + if (!tz->gtrips) {
> > + ret = -ENOMEM;
> > + goto free_tbps;
> > + }
> > +
> > + for (i = 0; i < tz->ntrips; i++)
> > + memcpy(&(tz->gtrips[i]),
> > &(tz->trips[i].temperature),
> > + sizeof(*tz->gtrips));
> > +
> > finish:
> > of_node_put(child);
> > tz->mode = THERMAL_DEVICE_DISABLED;
> > @@ -793,6 +825,7 @@ static inline void of_thermal_free_zone(struct
> > __thermal_zone *tz) {
> > int i;
> >
> > + kfree(tz->gtrips);
> > for (i = 0; i < tz->num_tbps; i++)
> > of_node_put(tz->tbps[i].cooling_device);
> > kfree(tz->tbps);
> > diff --git a/drivers/thermal/thermal_core.h
> > b/drivers/thermal/thermal_core.h index 466208c..a9580ca 100644
> > --- a/drivers/thermal/thermal_core.h
> > +++ b/drivers/thermal/thermal_core.h
> > @@ -91,6 +91,8 @@ int of_parse_thermal_zones(void);
> > void of_thermal_destroy_zones(void);
> > int of_thermal_get_ntrips(struct thermal_zone_device *);
> > bool of_thermal_is_trip_en(struct thermal_zone_device *, int);
> > +const struct thermal_trip * const
> > +of_thermal_get_trip_points(struct thermal_zone_device *);
> > #else
> > static inline int of_parse_thermal_zones(void) { return 0; }
> > static inline void of_thermal_destroy_zones(void) { }
> > @@ -102,6 +104,11 @@ static inline bool
> > of_thermal_is_trip_en(struct thermal_zone_device *, int) {
>
> This produces compilation error when CONFIG_THERMAL_OF is not set.
> Name the parameters to fix.
As all the other cases, I will fix that.
>
> > return 0;
> > }
> > +static inline const struct thermal_trip * const
> > +of_thermal_get_trip_points(struct thermal_zone_device *)
> > +{
> > + return NULL;
> > +}
> > #endif
> >
> > #endif /* __THERMAL_CORE_H__ */
> > diff --git a/include/linux/thermal.h b/include/linux/thermal.h
> > index 5bc28a7..88d7249 100644
> > --- a/include/linux/thermal.h
> > +++ b/include/linux/thermal.h
> > @@ -303,6 +303,20 @@ struct thermal_zone_of_device_ops {
> > int (*get_trend)(void *, long *);
> > };
> >
> > +/**
> > + * struct thermal_trip - Structure representing themal trip points
> > exported from
> > + * of-thermal
> > + *
>
> The only problem I have with this name is that would look like it is
> in use in all thermal framework, which is not really the case. But I
> do think having a type here is a good thing. So, not sure :-)
It can stay to be struct thermal_trip or we can rename it to
struct of_thermal_trip.
I'm fine with both names.
>
> > + * @temperature: trip point temperature
> > + * @hysteresis: trip point hysteresis
> > + * @type: trip point type
> > + */
> > +struct thermal_trip {
> > + unsigned long int temperature;
> > + unsigned long int hysteresis;
> > + enum thermal_trip_type type;
> > +};
> > +
> > /* Function declarations */
> > #ifdef CONFIG_THERMAL_OF
> > struct thermal_zone_device *
> > --
> > 2.0.0.rc2
> >
--
Best regards,
Lukasz Majewski
Samsung R&D Institute Poland (SRPOL) | Linux Platform Group
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