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

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Meson8b and Meson8m2 use a 5-bit wide TSC (temperature sensor
coefficient). The SAR ADC registers however can only store (the lower)
4 bits. The fifth (upper-most) bit is stored inside the
MESON_HHI_DPLL_TOP_0[9] register from the HHI register area.
This adds a syscon property to the HHI register area so a driver can
fetch the HHI register map and store the fifth TSC bit in there.

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 2018-12-27 22:50:19 +01:00 committed by Jonathan Cameron
parent 6e33a125df
commit a4b475b1ab
1 changed files with 4 additions and 0 deletions
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4
Documentation/devicetree/bindings/iio/adc/amlogic,meson-saradc.txt
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@ -23,6 +23,10 @@ Required properties:
- #io-channel-cells: must be 1, see ../iio-bindings.txt
Optional properties:
- amlogic,hhi-sysctrl: phandle to the syscon which contains the 5th bit
of the TSC (temperature sensor coefficient) on
Meson8b and Meson8m2 (which used to calibrate the
temperature sensor)
- 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"