[PATCH] iio: humidity: si7020: add heater support

[Antoni Pokusinski]

Hello, thanks for the review. I have a one question though:

>> @@ -134,6 +259,10 @@ static int si7020_probe(struct i2c_client *client)
>>  	indio_dev->channels = si7020_channels;
>>  	indio_dev->num_channels = ARRAY_SIZE(si7020_channels);
>>  
>> +	/* Default register values */
>> +	data->user_reg = 0x3A;

>Can you build that up from fields with names?
>I don't like a magic value where I have no idea what some of the bits are.

In the datasheet it's said that all the bits that are set by default in
the `user_reg` are "reserved" and have no meaning for now. So perhaps
mentioning this in a simple comment would be sufficient here?