1 # SPDX-License-Identifier: GPL-2.0-only
4 $id: http://devicetree.org/schemas/iio/adc/qcom,spmi-vadc.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: Qualcomm's SPMI PMIC ADC
10 - Andy Gross <agross@kernel.org>
11 - Bjorn Andersson <bjorn.andersson@linaro.org>
14 SPMI PMIC voltage ADC (VADC) provides interface to clients to read
15 voltage. The VADC is a 15-bit sigma-delta ADC.
16 SPMI PMIC5/PMIC7 voltage ADC (ADC) provides interface to clients to read
17 voltage. The VADC is a 16-bit sigma-delta ADC.
23 - const: qcom,pms405-adc
24 - const: qcom,spmi-adc-rev2
34 description: VADC base address in the SPMI PMIC register map
49 End of conversion interrupt.
62 Represents the external channels which are connected to the ADC.
63 For compatible property "qcom,spmi-vadc" following channels, also known as
64 reference point channels, are used for result calibration and their channel
65 configuration nodes should be defined:
66 VADC_REF_625MV and/or VADC_SPARE1(based on PMIC version) VADC_REF_1250MV,
67 VADC_GND_REF and VADC_VDD_VADC.
73 See include/dt-bindings/iio/qcom,spmi-vadc.h
74 For PMIC7 ADC, the channel numbers are specified separately per PMIC
75 in the PMIC-specific files in include/dt-bindings/iio/.
78 $ref: /schemas/types.yaml#/definitions/string
80 ADC input of the platform as seen in the schematics.
81 For thermistor inputs connected to generic AMUX or GPIO inputs
82 these can vary across platform for the same pins. Hence select
83 the platform schematics name for this channel.
86 $ref: /schemas/types.yaml#/definitions/uint32
88 This parameter is used to decrease ADC sampling rate.
89 Quicker measurements can be made by reducing decimation ratio.
93 Used for scaling the channel input signal before the signal is
94 fed to VADC. The configuration for this node is to know the
95 pre-determined ratio and use it for post scaling. It is a pair of
96 integers, denoting the numerator and denominator of the fraction by which
97 input signal is multiplied. For example, <1 3> indicates the signal is scaled
98 down to 1/3 of its value before ADC measurement.
99 If property is not found default value depending on chip will be used.
100 $ref: /schemas/types.yaml#/definitions/uint32-array
104 - enum: [ 1, 3, 4, 6, 20, 8, 10 ]
111 Channel calibration type.
112 - For compatible property "qcom,spmi-vadc", if this property is
113 specified VADC will use the VDD reference (1.8V) and GND for
114 channel calibration. If property is not found, channel will be
115 calibrated with 0.625V and 1.25V reference channels, also
116 known as absolute calibration.
117 - For compatible property "qcom,spmi-adc5", "qcom,spmi-adc7" and
118 "qcom,spmi-adc-rev2", if this property is specified VADC will use
119 the VDD reference (1.875V) and GND for channel calibration. If
120 property is not found, channel will be calibrated with 0V and 1.25V
121 reference channels, also known as absolute calibration.
125 $ref: /schemas/types.yaml#/definitions/uint32
127 Time between AMUX getting configured and the ADC starting
128 conversion. The 'hw_settle_time' is an index used from valid values
129 and programmed in hardware to achieve the hardware settling delay.
132 $ref: /schemas/types.yaml#/definitions/uint32
134 Number of samples to be used for measurement.
135 Averaging provides the option to obtain a single measurement
136 from the ADC that is an average of multiple samples. The value
137 selected is 2^(value).
147 const: qcom,spmi-vadc
154 enum: [ 512, 1024, 2048, 4096 ]
158 enum: [ 0, 100, 200, 300, 400, 500, 600, 700, 800, 900, 1, 2,
163 enum: [ 1, 2, 4, 8, 16, 32, 64, 128, 256, 512 ]
170 const: qcom,spmi-adc-rev2
177 enum: [ 256, 512, 1024 ]
181 enum: [ 0, 100, 200, 300, 400, 500, 600, 700, 800, 900, 1, 2,
186 enum: [ 1, 2, 4, 8, 16 ]
193 const: qcom,spmi-adc5
200 enum: [ 250, 420, 840 ]
204 enum: [ 15, 100, 200, 300, 400, 500, 600, 700, 800, 900, 1, 2,
205 4, 6, 8, 10, 16, 32, 64, 128 ]
209 enum: [ 1, 2, 4, 8, 16 ]
216 const: qcom,spmi-adc7
223 enum: [ 85, 340, 1360 ]
227 enum: [ 15, 100, 200, 300, 400, 500, 600, 700, 1000, 2000, 4000,
228 8000, 16000, 32000, 64000, 128000 ]
232 enum: [ 1, 2, 4, 8, 16 ]
235 additionalProperties: false
240 #address-cells = <1>;
243 pmic_vadc: adc@3100 {
244 compatible = "qcom,spmi-vadc";
246 interrupts = <0x0 0x31 0x0 0x1>;
247 #address-cells = <1>;
249 #io-channel-cells = <1>;
254 qcom,decimation = <512>;
256 qcom,hw-settle-time = <200>;
257 qcom,avg-samples = <1>;
258 qcom,pre-scaling = <1 3>;