56 lines
1.7 KiB
Plaintext
56 lines
1.7 KiB
Plaintext
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* Mediatek PMIC AUXADC(Auxiliary Analog/Digital Converter)
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===============
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The PMIC AUXADC is a voltage ADC found in some Mediatek PMICs.
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It provides an IIO interface to clients to read voltage.
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Required properties:
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- compatible: Should be one of:
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- "mediatek,mt6357-auxadc": For PMIC MT6357 AUXADC
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- "mediatek,mt6358-auxadc": For PMIC MT6358 AUXADC
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- "mediatek,mt6359-auxadc": For PMIC MT6359 AUXADC
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- #io-channel-cells: Should be 1, see ../iio-bindings.txt
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Required properties for supported channel in subnodes:
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- channel: PMIC AUXADC channel number.
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See include/dt-bindings/iio/mt635x-auxadc.h
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Optional properties for supported channel in subnodes:
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- resistance-ratio: The mapping ratio from 1.8V domain to real voltage.
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It's represented by a 2-elements array like <7 2> which means
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(1.8V domain) * 7 / 2 = (Real voltage domain).
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If this property is not found, the default ratio is 1.
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- avg-num: Selects AUXADC average sample numbers for this channel.
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The valid values are 1, 4, 8, 16, 32, 64, 128, 256.
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If this property is not found, the default number is 8.
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Example:
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#include <dt-bindings/iio/mt635x-auxadc.h>
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/* AUXADC node */
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pmic_auxadc: pmic_auxadc {
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compatible = "mediatek,mt6359-auxadc";
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#io-channel-cells = <1>;
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batadc {
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channel = <AUXADC_BATADC>;
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resistance-ratio = <7 2>;
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avg-num = <128>;
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};
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bat_temp {
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channel = <AUXADC_BAT_TEMP>;
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resistance-ratio = <5 2>;
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};
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chip_temp {
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channel = <AUXADC_CHIP_TEMP>;
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};
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};
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/* IIO client node */
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thermal {
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io-channels = <&pmic_auxadc AUXADC_CHIP_TEMP>;
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io-channel-names = "pmic_chip_temp";
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};
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