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+# 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>;
+ };
+ };
+ };
+...
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-Qualcomm's PM8xxx voltage XOADC
-
-The Qualcomm PM8xxx PMICs contain a HK/XO ADC (Housekeeping/Crystal
-oscillator ADC) encompassing PM8018, PM8038, PM8058 and PM8921.
-
-Required properties:
-
-- compatible: should be one of:
- "qcom,pm8018-adc"
- "qcom,pm8038-adc"
- "qcom,pm8058-adc"
- "qcom,pm8921-adc"
-
-- reg: should contain the ADC base address in the PMIC, typically
- 0x197.
-
-- xoadc-ref-supply: should reference a regulator that can supply
- a reference voltage on demand. The reference voltage may vary
- with PMIC variant but is typically something like 2.2 or 1.8V.
-
-The following required properties are standard for IO channels, see
-iio-bindings.txt for more details, but notice that this particular
-ADC has a special addressing scheme that require two cells for
-identifying each ADC channel:
-
-- #address-cells: should be set to <2>, 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: should be set to <0>
-
-- #io-channel-cells: should be set to <2>, again the cells are
- precaler or premux followed by the analog muxing line.
-
-- interrupts: should refer to the parent PMIC interrupt controller
- and reference the proper ADC interrupt.
-
-Required subnodes:
-
-The ADC channels are configured as subnodes of the ADC.
-
-Since some of them are used for calibrating the ADC, these nodes are
-compulsory:
-
-adc-channel@c {
- reg = <0x00 0x0c>;
-};
-
-adc-channel@d {
- reg = <0x00 0x0d>;
-};
-
-adc-channel@f {
- reg = <0x00 0x0f>;
-};
-
-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.
-
-Optional subnodes: any channels other than channels [0x00 0x0c],
-[0x00 0x0d] and [0x00 0x0f] are optional.
-
-Required channel node properties:
-
-- reg: should contain the hardware channel number in the range
- 0 .. 0xff (8 bits).
-
-Optional channel node properties:
-
-- qcom,decimation:
- Value type: <u32>
- Definition: 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:
- Value type: <u32>
- Definition: 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
-
-Example:
-
-xoadc: xoadc@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>;
- };
-};
-
-/* IIO client node */
-iio-hwmon {
- compatible = "iio-hwmon";
- io-channels = <&xoadc 0x00 0x01>, /* Battery */
- <&xoadc 0x00 0x02>, /* DC in (charger) */
- <&xoadc 0x00 0x04>, /* VPH the main system voltage */
- <&xoadc 0x00 0x0b>, /* Die temperature */
- <&xoadc 0x00 0x0c>, /* Reference voltage 1.25V */
- <&xoadc 0x00 0x0d>, /* Reference voltage 0.625V */
- <&xoadc 0x00 0x0e>; /* Reference voltage 0.325V */
-};