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dt-bindings: iio: adc: meson-saradc: add temperature sensor support 

The 32-bit Meson8 SoC can use the SAR ADC to read the chip temperature.
This requires setting the correct TSC (temperature sensor coefficient),
which is programmed into the eFuse during the manufacturing process.
Meson8b and Meson8m2 are not supported yet because they have a 5-bit TSC
and only the first four bits are stored inside the SAR ADC registers.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Martin Blumenstingl 2018-11-04 00:10:23 +01:00 committed by Jonathan Cameron
parent addacf3b49
commit 27be1f6408
1 changed files with 6 additions and 0 deletions
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6
Documentation/devicetree/bindings/iio/adc/amlogic,meson-saradc.txt
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@ -22,6 +22,12 @@ Required properties:
- vref-supply: the regulator supply for the ADC reference voltage
- #io-channel-cells: must be 1, see ../iio-bindings.txt
Optional properties:
- nvmem-cells: phandle to the temperature_calib eFuse cells
- nvmem-cell-names: if present (to enable the temperature sensor
calibration) this must contain "temperature_calib"
Example:
saradc: adc@8680 {
compatible = "amlogic,meson-gxl-saradc", "amlogic,meson-saradc";