Re: Parallella board temperature sensing

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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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