Re: [lm-sensors] Parallella board temperature sensing

[Guenter Roeck <linux@roeck-us.net>]

On 06/06/2015 08:01 AM, Guenter Roeck wrote:
> On 06/06/2015 07:51 AM, Gergely Imreh wrote:
>> Hi,
>>
>> I was checking out what would it take to support lm-sensors on the
>> Parallella board[1]. It's an interesting little board with a dual core
>> Xilinx ARM Cortex-A9, an FPGA, and a 16-core Epiphany co-processor.
>> It's Xilinx XADC sensor used for temperature/voltage sensing does not
>> seem to be anywhere on the lm-sensors supported device list. Currently
>> users seem to monitor it through reading the device data directly from
>> the /sys entries and doing the necessary scaling and conversion (as it
>> was discussed on the Parallella forums, bash script included[2])
>>
>> In a nutshell, the data is accessible through
>> /sys/bus/iio/devices/iio:device0/in_temp0_{raw,offset,scale} files.
>> There are also 8 voltage readings there that could be extracted.
>>
>
> If it is supported through iio, it should be possible use the iio->hwmon
> bridge.
>

Here is an example devicetree entry, used to configure a max1139 as
hwmon device.

		max1139: voltage-sensor@35 {
	                compatible = "maxim,max1139";
                         reg = <0x35>;
                         vcc-supply = <&reg_3p3v>;
                         vref-supply = <&reg_3p3v>;
                         #io-channel-cells = <1>;
                 };

...

	max1139@35 {
                 compatible = "iio-hwmon";

                 io-channels = <&max1139 0>, <&max1139 1>, <&max1139 2>,
                         <&max1139 3>, <&max1139 4>, <&max1139 5>,
                         <&max1139 6>, <&max1139 7>, <&max1139 8>,
                         <&max1139 9>, <&max1139 10>, <&max1139 11>;
         };

Guenter


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