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dt-bindings: iio: imx8qxp-adc: add missing vref-supply

Although this property is used right now for IIO_CHAN_INFO_SCALE,
this ADC has two internal reference voltages, which the driver currently
doesn't make use of.

Fixes: db73419d8c06 ("dt-bindings: iio: adc: Add binding documentation for NXP IMX8QXP ADC")
Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Reviewed-by: Haibo Chen <haibo.chen@nxp.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20230424092312.61746-1-alexander.stein@ew.tq-group.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

authored by

Alexander Stein and committed by
Jonathan Cameron 72c1d110 3e27ef0c

+7
+7
Documentation/devicetree/bindings/iio/adc/nxp,imx8qxp-adc.yaml
··· 39 39 power-domains: 40 40 maxItems: 1 41 41 42 + vref-supply: 43 + description: | 44 + External ADC reference voltage supply on VREFH pad. If VERID[MVI] is 45 + set, there are additional, internal reference voltages selectable. 46 + VREFH1 is always from VREFH pad. 47 + 42 48 "#io-channel-cells": 43 49 const: 1 44 50 ··· 78 72 assigned-clocks = <&clk IMX_SC_R_ADC_0>; 79 73 assigned-clock-rates = <24000000>; 80 74 power-domains = <&pd IMX_SC_R_ADC_0>; 75 + vref-supply = <&reg_1v8>; 81 76 #io-channel-cells = <1>; 82 77 }; 83 78 };