Bindings/iio/adc/qcom,pm8018-adc.yaml

   1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
   2 %YAML 1.2
   3 ---
   4 $id: http://devicetree.org/schemas/iio/adc/qcom,pm8018-adc.yaml#
   5 $schema: http://devicetree.org/meta-schemas/core.yaml#
   6
   7 title: Qualcomm's PM8xxx voltage XOADC
   8
   9 maintainers:
  10   - Linus Walleij <linus.walleij@linaro.org>
  11
  12 description: |
  13   The Qualcomm PM8xxx PMICs contain a HK/XO ADC (Housekeeping/Crystal
  14   oscillator ADC) encompassing PM8018, PM8038, PM8058 and PM8921.
  15
  16 properties:
  17   compatible:
  18     enum:
  19       - qcom,pm8018-adc
  20       - qcom,pm8038-adc
  21       - qcom,pm8058-adc
  22       - qcom,pm8921-adc
  23
  24   reg:
  25     maxItems: 1
  26     description:
  27       ADC base address in the PMIC, typically 0x197.
  28
  29   xoadc-ref-supply:
  30     description:
  31       The reference voltage may vary with PMIC variant but is typically
  32       something like 2.2 or 1.8V.
  33
  34   interrupts:
  35     maxItems: 1
  36
  37   "#address-cells":
  38     const: 2
  39     description:
  40       The first cell is the prescaler (on PM8058) or premux (on PM8921)
  41       with two valid bits  so legal values are 0x00, 0x01 or 0x02.
  42       The second cell is the main analog mux setting (0x00..0x0f).
  43       The combination of prescaler/premux and analog mux uniquely addresses
  44       a hardware channel on all systems.
  45
  46   "#size-cells":
  47     const: 0
  48
  49   "#io-channel-cells":
  50     const: 2
  51     description:
  52       The cells are precaler or premux followed by the analog muxing line.
  53
  54 additionalProperties: false
  55
  56 required:
  57   - compatible
  58   - reg
  59   - "#io-channel-cells"
  60   - "#address-cells"
  61   - "#size-cells"
  62   - adc-channel@c
  63   - adc-channel@d
  64   - adc-channel@f
  65
  66 patternProperties:
  67   "^(adc-channel@)[0-9a-f]$":
  68     type: object
  69     description: |
  70       ADC channel specific configuration.
  71       Note that channels c, d and f must be present for calibration.
  72       These three nodes are used for absolute and ratiometric calibration
  73       and only need to have these reg values: they are by hardware definition
  74       1:1 ratio converters that sample 625, 1250 and 0 milliV and create
  75       an interpolation calibration for all other ADCs.
  76
  77     properties:
  78       reg:
  79         maxItems: 1
  80
  81       qcom,decimation:
  82         $ref: /schemas/types.yaml#/definitions/uint32
  83         description: |
  84           This parameter is used to decrease the ADC sampling rate.
  85           Quicker measurements can be made by reducing the decimation ratio.
  86           Valid values are 512, 1024, 2048, 4096.
  87           If the property is not found, a default value of 512 will be used.
  88
  89       qcom,ratiometric:
  90         $ref: /schemas/types.yaml#/definitions/uint32
  91         description: |
  92           Channel calibration type. If this property is specified
  93           VADC will use a special voltage references for channel
  94           calibration. The available references are specified in the
  95           as a u32 value setting (see below) and it is compulsory
  96           to also specify this reference if ratiometric calibration
  97           is selected.
  98
  99           If the property is not found, the channel will be
 100           calibrated with the 0.625V and 1.25V reference channels, also
 101           known as an absolute calibration.
 102
 103           The reference voltage pairs when using ratiometric calibration:
 104           0 = XO_IN/XOADC_GND
 105           1 = PMIC_IN/XOADC_GND
 106           2 = PMIC_IN/BMS_CSP
 107           3 (invalid)
 108           4 = XOADC_GND/XOADC_GND
 109           5 = XOADC_VREF/XOADC_GND
 110
 111     additionalProperties: false
 112
 113     required:
 114       - reg
 115
 116 examples:
 117   - |
 118     #include <dt-bindings/interrupt-controller/irq.h>
 119     pmic {
 120         #address-cells = <1>;
 121         #size-cells = <0>;
 122
 123         adc@197 {
 124             compatible = "qcom,pm8058-adc";
 125             reg = <0x197>;
 126             interrupts-extended = <&pm8058 76 IRQ_TYPE_EDGE_RISING>;
 127             #address-cells = <2>;
 128             #size-cells = <0>;
 129             #io-channel-cells = <2>;
 130
 131             vcoin: adc-channel@0 {
 132                 reg = <0x00 0x00>;
 133             };
 134             vbat: adc-channel@1 {
 135                 reg = <0x00 0x01>;
 136             };
 137             dcin: adc-channel@2 {
 138                 reg = <0x00 0x02>;
 139             };
 140             ichg: adc-channel@3 {
 141                 reg = <0x00 0x03>;
 142             };
 143             vph_pwr: adc-channel@4 {
 144                 reg = <0x00 0x04>;
 145             };
 146             usb_vbus: adc-channel@a {
 147                 reg = <0x00 0x0a>;
 148             };
 149             die_temp: adc-channel@b {
 150                 reg = <0x00 0x0b>;
 151             };
 152             ref_625mv: adc-channel@c {
 153                 reg = <0x00 0x0c>;
 154             };
 155             ref_1250mv: adc-channel@d {
 156                 reg = <0x00 0x0d>;
 157             };
 158             ref_325mv: adc-channel@e {
 159                 reg = <0x00 0x0e>;
 160             };
 161             ref_muxoff: adc-channel@f {
 162                 reg = <0x00 0x0f>;
 163             };
 164         };
 165     };
 166 ...