linux-kernel - Re: [PATCHv4 1/1] thermal: of: improve of-thermal sensor registration API

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Date:	Wed, 19 Nov 2014 17:43:20 +0200
From:	Mikko Perttunen <mikko.perttunen@...si.fi>
To:	Eduardo Valentin <edubezval@...il.com>,
	Linux PM <linux-pm@...r.kernel.org>
CC:	Caesar Wang <caesar.wang@...k-chips.com>, Wei Ni <wni@...dia.com>,
	Lukasz Majewski <l.majewski@...sung.com>,
	Alexandre Courbot <gnurou@...il.com>,
	devicetree@...r.kernel.org, Grant Likely <grant.likely@...aro.org>,
	Guenter Roeck <linux@...ck-us.net>,
	Jean Delvare <jdelvare@...e.de>, linux-kernel@...r.kernel.org,
	linux-tegra@...r.kernel.org, lm-sensors@...sensors.org,
	Rob Herring <robh+dt@...nel.org>,
	Stephen Warren <swarren@...dotorg.org>,
	Thierry Reding <thierry.reding@...il.com>,
	Zhang Rui <rui.zhang@...el.com>
Subject: Re: [PATCHv4 1/1] thermal: of: improve of-thermal sensor registration
 API

On 11/19/2014 05:41 PM, Mikko Perttunen wrote:
> On 11/18/2014 04:39 PM, Eduardo Valentin wrote:
>> Different drivers request API extensions in of-thermal. For this reason,
>> additional callbacks are required to fit the new drivers needs.
>>
>> The current API implementation expects the registering sensor driver
>> to provide a get_temp and get_trend callbacks as function parameters.
>> As the amount of callbacks is growing, this patch changes the existing
>> implementation to use a .ops field to hold all the of thermal callbacks
>> to sensor drivers.
>>
>> This patch also changes the existing of-thermal users to fit the new
>> API design. No functional change is introduced in this patch.
>>
>> Cc: Alexandre Courbot <gnurou@...il.com>
>> Cc: devicetree@...r.kernel.org
>> Cc: Grant Likely <grant.likely@...aro.org>
>> Cc: Guenter Roeck <linux@...ck-us.net>
>> Cc: Jean Delvare <jdelvare@...e.de>
>> Cc: linux-kernel@...r.kernel.org
>> Cc: linux-pm@...r.kernel.org
>> Cc: linux-tegra@...r.kernel.org
>> Cc: lm-sensors@...sensors.org
>> Cc: Rob Herring <robh+dt@...nel.org>
>> Cc: Stephen Warren <swarren@...dotorg.org>
>> Cc: Thierry Reding <thierry.reding@...il.com>
>> Cc: Zhang Rui <rui.zhang@...el.com>
>> Reviewed-by: Lukasz Majewski <l.majewski@...sung.com>
>> Signed-off-by: Eduardo Valentin <edubezval@...il.com>
>> ---
>>   drivers/hwmon/lm75.c                               |  9 +++--
>>   drivers/hwmon/ntc_thermistor.c                     |  6 +++-
>>   drivers/hwmon/tmp102.c                             |  6 +++-
>>   drivers/thermal/of-thermal.c                       | 40
>> ++++++++++------------
>>   drivers/thermal/tegra_soctherm.c                   |  7 ++--
>>   drivers/thermal/ti-soc-thermal/ti-thermal-common.c |  8 +++--
>>   include/linux/thermal.h                            | 24 +++++++++----
>>   7 files changed, 63 insertions(+), 37 deletions(-)
>> ---
>> Difference from V3:
>>    - Keep the same behavior regarding callback checks.
>>      Change in behavior may be sent in a separate patch.
>> Difference from V2:
>>    - Fix wrong assignment in tegra driver.
>> Difference from V1:
>>    - Fix error handling when .get_trend is not provided.
>>
>> @@ -356,8 +356,8 @@ thermal_zone_of_add_sensor(struct device_node *zone,
>>    *             than one sensors
>>    * @data: a private pointer (owned by the caller) that will be passed
>>    *        back, when a temperature reading is needed.
>> - * @get_temp: a pointer to a function that reads the sensor temperature.
>> - * @get_trend: a pointer to a function that reads the sensor
>> temperature trend.
>> + * @ops: struct thermal_zone_of_device *. Must contain at least
>> .get_trend and
>> + *       .get_temp.
>
> This comment seems to be incorrect, as .get_trend is optional.

Also, the parameter is of type struct thermal_zone_of_device_ops *, not 
just thermal_zone_of_device.

>
>>    *
>>    * This function will search the list of thermal zones described in
>> device
>>    * tree and look for the zone that refer to the sensor device
>> pointed by
>
> With that minor one fixed,
>
> Tested-by: Mikko Perttunen <mikko.perttunen@...si.fi>
> Reviewed-by: Mikko Perttunen <mikko.perttunen@...si.fi>
>
> Cheers,
> Mikko
> --
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