Re: [PATCH v2 3/8] ARM: OMAP5: Thermal: Add slope and offset values

From	Keerthy <j-keerthy@ti.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH v2 3/8] ARM: OMAP5: Thermal: Add slope and offset values
Date	2017-03-30 05:40 +0200
Message-ID	<tqz6h-8J-1@gated-at.bofh.it> (permalink)
References	<tj1j3-2og-7@gated-at.bofh.it> <tj1j4-2og-43@gated-at.bofh.it> <tqdyO-1J4-11@gated-at.bofh.it>
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On Wednesday 29 March 2017 10:03 AM, Eduardo Valentin wrote:
> On Thu, Mar 09, 2017 at 01:35:57PM +0530, Keerthy wrote:
>> Currently the slope and offset values for calculating the
>> hot spot temperature of a particular thermal zone is part
>> of driver data. Pass them here instead and obtain the values
>> while of node parsing.
> 
> 
> The patch is fine.. but
> 
>>
>> Signed-off-by: Keerthy <j-keerthy@ti.com>
>> ---
>>  arch/arm/boot/dts/omap5.dtsi | 9 +++++++++
>>  1 file changed, 9 insertions(+)
>>
>> diff --git a/arch/arm/boot/dts/omap5.dtsi b/arch/arm/boot/dts/omap5.dtsi
>> index 222155c..eaff2a5 100644
>> --- a/arch/arm/boot/dts/omap5.dtsi
>> +++ b/arch/arm/boot/dts/omap5.dtsi
>> @@ -1127,6 +1127,15 @@
>>  
>>  &cpu_thermal {
>>  	polling-delay = <500>; /* milliseconds */
>> +	coefficients = <65 (-1791)>;
> 
> I suppose you tried this change with this patch:
> https://patchwork.kernel.org/patch/9619577/
> ?
> 
> Otherwise, I do not see how your coeff would work, right?

IIRC i did not have that patch.

But No issues there. I did try deliberately with negative values and i
retrieved the negative values in driver nicely.

Fox ex: -20 unsigned when retrieved in driver as an int coeff will give
me -20. I checked with multiple negative co-efficients and i retrieved
the passed negative co-efficients in driver from DT.

Regards,
Keerthy


> 
>>  };
>>  
>>  /include/ "omap54xx-clocks.dtsi"
>> +
>> +&gpu_thermal {
>> +	coefficients = <117 (-2992)>;
>> +};
>> +
>> +&core_thermal {
>> +	coefficients = <0 2000>;
>> +};
>> -- 
>> 1.9.1
>>

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Re: [PATCH v2 3/8] ARM: OMAP5: Thermal: Add slope and offset values Eduardo Valentin <edubezval@gmail.com> - 2017-03-29 06:40 +0200
  Re: [PATCH v2 3/8] ARM: OMAP5: Thermal: Add slope and offset values Keerthy <j-keerthy@ti.com> - 2017-03-30 05:40 +0200

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