topic Device tree configuration for humidity sensor in i.MX Processors

Device tree configuration for humidity sensor

devikar — Tue, 04 Jun 2019 07:14:35 GMT

Hi,

We have setup Yocto project 4.9.11_1.0.0 for imx6qpsabresd and need to add device tree configuration for temperature and humidity sensor(si7020).
We have added the following lines in imx6qdl-sabresd.dtsi file and also enabled si7020 as a module in kernel configuration.But it looks like the kernel module is not executing the functions after inserting it, as we are not seeing a print messages of "init/probe" functions.

adc: si7020@40 {
               compatible = "silabs,si7020";
               reg = <0x40>;
               #io-channel-cells = <1>;
};

iio-hwmon {
compatible = "iio-hwmon";
io-channels = <&adc 0>, <&adc 1>, <&adc 2>;
};

Can you please let us know about if there is something wrong with this dts?

Thanks,

Devika

Re: Device tree configuration for humidity sensor

igorpadykov — Tue, 04 Jun 2019 23:37:12 GMT

Hi devika

one can look at examples for sensors isl29023, mag3110 and sect.2.8 Sensors attached Linux Manual
https://source.codeaurora.org/external/imx/linux-imx/tree/arch/arm/boot/dts/imx6qdl-sabreauto.dtsi?h=imx_4.9.11_1.0.0_ga

Best regards
igor
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Re: Device tree configuration for humidity sensor

devikar — Thu, 06 Jun 2019 10:56:35 GMT

Hi,

Thanks for the reply.

Now we are able to get the print messages of probe functions as we have enabled si7020 as built-in module in menuconfig.

It was not the problem with dts configuration.

Thanks,

Devika