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