linux-kernel - Re: [PATCH V2 1/2] ARM: dts: DRA7: Add bandgap and related thermal nodes

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Date:	Fri, 27 Mar 2015 13:38:07 +0530
From:	Keerthy <a0393675@...com>
To:	Nishanth Menon <nm@...com>, <tony@...mide.com>,
	<bcousson@...libre.com>, <edubezval@...il.com>
CC:	<linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<devicetree@...r.kernel.org>, <linux-omap@...r.kernel.org>,
	<j-keerthy@...com>, <t-kristo@...com>
Subject: Re: [PATCH V2 1/2] ARM: dts: DRA7: Add bandgap and related thermal
 nodes



On Friday 27 March 2015 11:32 AM, Keerthy wrote:
>
>
> On Tuesday 24 March 2015 01:09 AM, Nishanth Menon wrote:
>> From: Keerthy <j-keerthy@...com>
>>
>> Add bandgap and related thermal nodes. The patch adds 5 thermal
>> sensors. Only one cooling device for mpu as of now. The sensors are
>> the exact same on both dra72 and dra7. Introduce CPU, GPU, core nodes
>> for the moment as they are direct reuse of OMAP5 entities.
>>
>> NOTE: OMAP4 has a finer counter granularity, which allows for a delay
>> of 1000ms in the thermal zone polling intervals. DRA7 have different
>> counter mechanism, which allows at maximum a 500ms timer. Adjust the
>> cpu thermal zone accordingly for DRA7.
>>
>> Signed-off-by: Keerthy <j-keerthy@...com>
>> [t-kristo@...com: few reuse from OMAP5 entities]
>> Signed-off-by: Tero Kristo <t-kristo@...com>
>> Signed-off-by: Nishanth Menon <nm@...com>
>> ---
>> Changes since V1:
>>     - omap5-cpu-thermal.dtsi dropped
>>     - approach similar to omap5
>>     - added core and gpu thermal dtsi(they can be reused)
>>     - Squashed patch #1 from v1 to patch #2 - this patch.
>>     - Not carrying forward ack due to change
>
> Thanks for updating Nishanth. Looks good to me.

Tested on DRA7 EVM.

Read the temperatures from all the 5 sensors they were sane.
Loaded the CPU and saw the temperatures rise and fall with increase and 
decrease in the load.

Tested-by: Keerthy <j-keerthy@...com>
>
> - Keerthy
>
>>
>> V1: http://marc.info/?t=142688102700006&r=1&w=2
>>
>>   arch/arm/boot/dts/dra7.dtsi   |   23 +++++++++++++++++++++++
>>   arch/arm/boot/dts/dra72x.dtsi |    5 +++++
>>   arch/arm/boot/dts/dra74x.dtsi |    5 +++++
>>   3 files changed, 33 insertions(+)
>>
>> diff --git a/arch/arm/boot/dts/dra7.dtsi b/arch/arm/boot/dts/dra7.dtsi
>> index eea4a54d6cb3..2d6a7e3e001f 100644
>> --- a/arch/arm/boot/dts/dra7.dtsi
>> +++ b/arch/arm/boot/dts/dra7.dtsi
>> @@ -177,6 +177,18 @@
>>               };
>>           };
>>
>> +        bandgap: bandgap@...021e0 {
>> +            reg = <0x4a0021e0 0xc
>> +                0x4a00232c 0xc
>> +                0x4a002380 0x2c
>> +                0x4a0023C0 0x3c
>> +                0x4a002564 0x8
>> +                0x4a002574 0x50>;
>> +                compatible = "ti,dra752-bandgap";
>> +                interrupts = <GIC_SPI 121 IRQ_TYPE_LEVEL_HIGH>;
>> +                #thermal-sensor-cells = <1>;
>> +        };
>> +
>>           cm_core_aon: cm_core_aon@...05000 {
>>               compatible = "ti,dra7-cm-core-aon";
>>               reg = <0x4a005000 0x2000>;
>> @@ -1419,6 +1431,17 @@
>>               status = "disabled";
>>           };
>>       };
>> +
>> +    thermal_zones: thermal-zones {
>> +        #include "omap4-cpu-thermal.dtsi"
>> +        #include "omap5-gpu-thermal.dtsi"
>> +        #include "omap5-core-thermal.dtsi"
>> +    };
>> +
>> +};
>> +
>> +&cpu_thermal {
>> +    polling-delay = <500>; /* milliseconds */
>>   };
>>
>>   /include/ "dra7xx-clocks.dtsi"
>> diff --git a/arch/arm/boot/dts/dra72x.dtsi
>> b/arch/arm/boot/dts/dra72x.dtsi
>> index e5a3d23a3df1..6ac8e3601499 100644
>> --- a/arch/arm/boot/dts/dra72x.dtsi
>> +++ b/arch/arm/boot/dts/dra72x.dtsi
>> @@ -20,6 +20,11 @@
>>               device_type = "cpu";
>>               compatible = "arm,cortex-a15";
>>               reg = <0>;
>> +
>> +            /* cooling options */
>> +            cooling-min-level = <0>;
>> +            cooling-max-level = <2>;
>> +            #cooling-cells = <2>; /* min followed by max */
>>           };
>>       };
>>
>> diff --git a/arch/arm/boot/dts/dra74x.dtsi
>> b/arch/arm/boot/dts/dra74x.dtsi
>> index 10173fab1a15..eef981f4bcd5 100644
>> --- a/arch/arm/boot/dts/dra74x.dtsi
>> +++ b/arch/arm/boot/dts/dra74x.dtsi
>> @@ -31,6 +31,11 @@
>>               clock-names = "cpu";
>>
>>               clock-latency = <300000>; /* From omap-cpufreq driver */
>> +
>> +            /* cooling options */
>> +            cooling-min-level = <0>;
>> +            cooling-max-level = <2>;
>> +            #cooling-cells = <2>; /* min followed by max */
>>           };
>>           cpu@1 {
>>               device_type = "cpu";
>>
--
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