Re: [PATCH] hwmon: Add driver for EXYNOS4 TMU

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On 2011년 08월 25일 18:17, Jean Delvare wrote:
> Hi Kim,
> 
> On Thu, 25 Aug 2011 17:13:54 +0900, Donggeun Kim wrote:
>> This patch allows to read temperature
>> from TMU(Thermal Management Unit) of SAMSUNG EXYNOS4 series of SoC.
>>
>> Signed-off-by: Donggeun Kim <dg77.kim@xxxxxxxxxxx>
>> Signed-off-by: MyungJoo Ham <myungjoo.ham@xxxxxxxxxxx>
>> Signed-off-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
>> ---
>>  Documentation/hwmon/exynos4_tmu           |   66 ++++
>>  drivers/hwmon/Kconfig                     |   10 +
>>  drivers/hwmon/Makefile                    |    1 +
>>  drivers/hwmon/exynos4_tmu.c               |  478 +++++++++++++++++++++++++++++
>>  include/linux/platform_data/exynos4_tmu.h |   83 +++++
>>  5 files changed, 638 insertions(+), 0 deletions(-)
>>  create mode 100644 Documentation/hwmon/exynos4_tmu
>>  create mode 100644 drivers/hwmon/exynos4_tmu.c
>>  create mode 100644 include/linux/platform_data/exynos4_tmu.h
> 
> I don't have time for a full review at the moment, but one thing stood
> out so I'm commenting on that:
> 
>> +temp1_alarm	shows which interrupt threshold level is met
>> +		1: current temperature exceeds level_0
>> +		10: current temperature exceeds level_1
>> +		100: current temperature exceeds level_2
>> +		1000: current temperature exceeds level_3
>> +		RO
> 
> This doesn't fit in the standard interface described in
> Documentation/hwmon/sysfs-interface and will thus not be accepted.
> 
> Unfortunately the best you can do with the standard interface is 3
> limits, not four. So you'd have:
> 
> temp1_max_alarm
> temp1_crit_alarm
> temp1_emergency_alarm
> 
> so you'll have to omit one of the levels, or map two levels to one
> alarm file. These alarm files can only return 0 or 1.
> 
> BTW it would be great if you could also implement the corresponding
> temp1_max, temp1_crit and temp1_emergency files, at least read-only,
> otherwise the alarm files aren't so useful.
> 
I will add the mentioned files in the next patch.
Thank you for your review.


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