167 lines
4.7 KiB
YAML
167 lines
4.7 KiB
YAML
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# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/iio/adc/qcom,pm8018-adc.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: Qualcomm's PM8xxx voltage XOADC
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maintainers:
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- Linus Walleij <linus.walleij@linaro.org>
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description: |
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The Qualcomm PM8xxx PMICs contain a HK/XO ADC (Housekeeping/Crystal
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oscillator ADC) encompassing PM8018, PM8038, PM8058 and PM8921.
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properties:
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compatible:
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enum:
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- qcom,pm8018-adc
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- qcom,pm8038-adc
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- qcom,pm8058-adc
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- qcom,pm8921-adc
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reg:
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maxItems: 1
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description:
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ADC base address in the PMIC, typically 0x197.
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xoadc-ref-supply:
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description:
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The reference voltage may vary with PMIC variant but is typically
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something like 2.2 or 1.8V.
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interrupts:
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maxItems: 1
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"#address-cells":
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const: 2
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description:
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The first cell is the prescaler (on PM8058) or premux (on PM8921)
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with two valid bits so legal values are 0x00, 0x01 or 0x02.
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The second cell is the main analog mux setting (0x00..0x0f).
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The combination of prescaler/premux and analog mux uniquely addresses
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a hardware channel on all systems.
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"#size-cells":
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const: 0
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"#io-channel-cells":
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const: 2
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description:
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The cells are precaler or premux followed by the analog muxing line.
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additionalProperties: false
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required:
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- compatible
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- reg
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- "#io-channel-cells"
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- "#address-cells"
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- "#size-cells"
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- adc-channel@c
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- adc-channel@d
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- adc-channel@f
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patternProperties:
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"^(adc-channel@)[0-9a-f]$":
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type: object
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description: |
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ADC channel specific configuration.
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Note that channels c, d and f must be present for calibration.
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These three nodes are used for absolute and ratiometric calibration
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and only need to have these reg values: they are by hardware definition
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1:1 ratio converters that sample 625, 1250 and 0 milliV and create
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an interpolation calibration for all other ADCs.
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properties:
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reg:
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maxItems: 1
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qcom,decimation:
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$ref: /schemas/types.yaml#/definitions/uint32
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description: |
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This parameter is used to decrease the ADC sampling rate.
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Quicker measurements can be made by reducing the decimation ratio.
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Valid values are 512, 1024, 2048, 4096.
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If the property is not found, a default value of 512 will be used.
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qcom,ratiometric:
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$ref: /schemas/types.yaml#/definitions/uint32
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description: |
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Channel calibration type. If this property is specified
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VADC will use a special voltage references for channel
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calibration. The available references are specified in the
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as a u32 value setting (see below) and it is compulsory
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to also specify this reference if ratiometric calibration
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is selected.
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If the property is not found, the channel will be
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calibrated with the 0.625V and 1.25V reference channels, also
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known as an absolute calibration.
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The reference voltage pairs when using ratiometric calibration:
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0 = XO_IN/XOADC_GND
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1 = PMIC_IN/XOADC_GND
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2 = PMIC_IN/BMS_CSP
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3 (invalid)
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4 = XOADC_GND/XOADC_GND
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5 = XOADC_VREF/XOADC_GND
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additionalProperties: false
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required:
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- reg
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examples:
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- |
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#include <dt-bindings/interrupt-controller/irq.h>
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pmic {
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#address-cells = <1>;
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#size-cells = <0>;
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adc@197 {
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compatible = "qcom,pm8058-adc";
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reg = <0x197>;
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interrupts-extended = <&pm8058 76 IRQ_TYPE_EDGE_RISING>;
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#address-cells = <2>;
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#size-cells = <0>;
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#io-channel-cells = <2>;
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vcoin: adc-channel@0 {
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reg = <0x00 0x00>;
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};
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vbat: adc-channel@1 {
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reg = <0x00 0x01>;
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};
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dcin: adc-channel@2 {
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reg = <0x00 0x02>;
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};
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ichg: adc-channel@3 {
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reg = <0x00 0x03>;
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};
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vph_pwr: adc-channel@4 {
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reg = <0x00 0x04>;
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};
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usb_vbus: adc-channel@a {
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reg = <0x00 0x0a>;
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};
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die_temp: adc-channel@b {
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reg = <0x00 0x0b>;
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};
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ref_625mv: adc-channel@c {
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reg = <0x00 0x0c>;
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};
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ref_1250mv: adc-channel@d {
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reg = <0x00 0x0d>;
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};
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ref_325mv: adc-channel@e {
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reg = <0x00 0x0e>;
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};
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ref_muxoff: adc-channel@f {
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reg = <0x00 0x0f>;
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};
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};
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};
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...
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