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.
74 See include/dt-bindings/iio/qcom,spmi-vadc.h
75 For PMIC7 ADC, the channel numbers are specified separately per PMIC
76 in the PMIC-specific files in include/dt-bindings/iio/.
79 $ref: /schemas/types.yaml#/definitions/string
81 ADC input of the platform as seen in the schematics.
82 For thermistor inputs connected to generic AMUX or GPIO inputs
83 these can vary across platform for the same pins. Hence select
84 the platform schematics name for this channel.
87 $ref: /schemas/types.yaml#/definitions/uint32
89 This parameter is used to decrease ADC sampling rate.
90 Quicker measurements can be made by reducing decimation ratio.
94 Used for scaling the channel input signal before the signal is
95 fed to VADC. The configuration for this node is to know the
96 pre-determined ratio and use it for post scaling. It is a pair of
97 integers, denoting the numerator and denominator of the fraction by which
98 input signal is multiplied. For example, <1 3> indicates the signal is scaled
99 down to 1/3 of its value before ADC measurement.
100 If property is not found default value depending on chip will be used.
101 $ref: /schemas/types.yaml#/definitions/uint32-array
105 - enum: [ 1, 3, 4, 6, 20, 8, 10 ]
112 Channel calibration type.
113 - For compatible property "qcom,spmi-vadc", if this property is
114 specified VADC will use the VDD reference (1.8V) and GND for
115 channel calibration. If property is not found, channel will be
116 calibrated with 0.625V and 1.25V reference channels, also
117 known as absolute calibration.
118 - For compatible property "qcom,spmi-adc5", "qcom,spmi-adc7" and
119 "qcom,spmi-adc-rev2", if this property is specified VADC will use
120 the VDD reference (1.875V) and GND for channel calibration. If
121 property is not found, channel will be calibrated with 0V and 1.25V
122 reference channels, also known as absolute calibration.
126 $ref: /schemas/types.yaml#/definitions/uint32
128 Time between AMUX getting configured and the ADC starting
129 conversion. The 'hw_settle_time' is an index used from valid values
130 and programmed in hardware to achieve the hardware settling delay.
133 $ref: /schemas/types.yaml#/definitions/uint32
135 Number of samples to be used for measurement.
136 Averaging provides the option to obtain a single measurement
137 from the ADC that is an average of multiple samples. The value
138 selected is 2^(value).
148 const: qcom,spmi-vadc
155 enum: [ 512, 1024, 2048, 4096 ]
159 enum: [ 0, 100, 200, 300, 400, 500, 600, 700, 800, 900, 1, 2,
164 enum: [ 1, 2, 4, 8, 16, 32, 64, 128, 256, 512 ]
171 const: qcom,spmi-adc-rev2
178 enum: [ 256, 512, 1024 ]
182 enum: [ 0, 100, 200, 300, 400, 500, 600, 700, 800, 900, 1, 2,
187 enum: [ 1, 2, 4, 8, 16 ]
194 const: qcom,spmi-adc5
201 enum: [ 250, 420, 840 ]
205 enum: [ 15, 100, 200, 300, 400, 500, 600, 700, 800, 900, 1, 2,
206 4, 6, 8, 10, 16, 32, 64, 128 ]
210 enum: [ 1, 2, 4, 8, 16 ]
217 const: qcom,spmi-adc7
224 enum: [ 85, 340, 1360 ]
228 enum: [ 15, 100, 200, 300, 400, 500, 600, 700, 1000, 2000, 4000,
229 8000, 16000, 32000, 64000, 128000 ]
233 enum: [ 1, 2, 4, 8, 16 ]
236 additionalProperties: false
241 #address-cells = <1>;
244 pmic_vadc: adc@3100 {
245 compatible = "qcom,spmi-vadc";
247 interrupts = <0x0 0x31 0x0 0x1>;
248 #address-cells = <1>;
250 #io-channel-cells = <1>;
255 qcom,decimation = <512>;
257 qcom,hw-settle-time = <200>;
258 qcom,avg-samples = <1>;
259 qcom,pre-scaling = <1 3>;