1 # SPDX-License-Identifier: GPL-2.0-only
4 $id: http://devicetree.org/schemas/iio/adc/qcom,spmi-vadc.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: Qualcomm's SPMI PMIC ADC
10 - Andy Gross <agross@kernel.org>
11 - Bjorn Andersson <bjorn.andersson@linaro.org>
14 SPMI PMIC voltage ADC (VADC) provides interface to clients to read
15 voltage. The VADC is a 15-bit sigma-delta ADC.
16 SPMI PMIC5/PMIC7 voltage ADC (ADC) provides interface to clients to read
17 voltage. The VADC is a 16-bit sigma-delta ADC.
23 - const: qcom,pms405-adc
24 - const: qcom,spmi-adc-rev2
32 description: VADC base address in the SPMI PMIC register map
47 End of conversion interrupt.
57 "^channel@[0-9a-f]+$":
59 additionalProperties: false
61 Represents the external channels which are connected to the ADC.
62 For compatible property "qcom,spmi-vadc" following channels, also known as
63 reference point channels, are used for result calibration and their channel
64 configuration nodes should be defined:
65 VADC_REF_625MV and/or VADC_SPARE1(based on PMIC version) VADC_REF_1250MV,
66 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/.
79 ADC input of the platform as seen in the schematics.
80 For thermistor inputs connected to generic AMUX or GPIO inputs
81 these can vary across platform for the same pins. Hence select
82 the platform schematics name for this channel.
85 $ref: /schemas/types.yaml#/definitions/uint32
87 This parameter is used to decrease ADC sampling rate.
88 Quicker measurements can be made by reducing decimation ratio.
92 Used for scaling the channel input signal before the signal is
93 fed to VADC. The configuration for this node is to know the
94 pre-determined ratio and use it for post scaling. It is a pair of
95 integers, denoting the numerator and denominator of the fraction by which
96 input signal is multiplied. For example, <1 3> indicates the signal is scaled
97 down to 1/3 of its value before ADC measurement.
98 If property is not found default value depending on chip will be used.
99 $ref: /schemas/types.yaml#/definitions/uint32-array
103 - enum: [ 1, 3, 4, 6, 20, 8, 10, 16 ]
110 Channel calibration type.
111 - For compatible property "qcom,spmi-vadc", if this property is
112 specified VADC will use the VDD reference (1.8V) and GND for
113 channel calibration. If property is not found, channel will be
114 calibrated with 0.625V and 1.25V reference channels, also
115 known as absolute calibration.
116 - For compatible property "qcom,spmi-adc5", "qcom,spmi-adc7" and
117 "qcom,spmi-adc-rev2", if this property is specified VADC will use
118 the VDD reference (1.875V) and GND for channel calibration. If
119 property is not found, channel will be calibrated with 0V and 1.25V
120 reference channels, also known as absolute calibration.
124 $ref: /schemas/types.yaml#/definitions/uint32
126 Time between AMUX getting configured and the ADC starting
127 conversion. The 'hw_settle_time' is an index used from valid values
128 and programmed in hardware to achieve the hardware settling delay.
131 $ref: /schemas/types.yaml#/definitions/uint32
133 Number of samples to be used for measurement.
134 Averaging provides the option to obtain a single measurement
135 from the ADC that is an average of multiple samples. The value
136 selected is 2^(value).
146 const: qcom,spmi-vadc
150 "^channel@[0-9a-f]+$":
153 enum: [ 512, 1024, 2048, 4096 ]
157 enum: [ 0, 100, 200, 300, 400, 500, 600, 700, 800, 900, 1, 2,
162 enum: [ 1, 2, 4, 8, 16, 32, 64, 128, 256, 512 ]
169 const: qcom,spmi-adc-rev2
173 "^channel@[0-9a-f]+$":
176 enum: [ 256, 512, 1024 ]
180 enum: [ 0, 100, 200, 300, 400, 500, 600, 700, 800, 900, 1, 2,
185 enum: [ 1, 2, 4, 8, 16 ]
192 const: qcom,spmi-adc5
196 "^channel@[0-9a-f]+$":
199 enum: [ 250, 420, 840 ]
203 enum: [ 15, 100, 200, 300, 400, 500, 600, 700, 800, 900, 1, 2,
204 4, 6, 8, 10, 16, 32, 64, 128 ]
208 enum: [ 1, 2, 4, 8, 16 ]
215 const: qcom,spmi-adc7
219 "^channel@[0-9a-f]+$":
222 enum: [ 85, 340, 1360 ]
226 enum: [ 15, 100, 200, 300, 400, 500, 600, 700, 1000, 2000, 4000,
227 8000, 16000, 32000, 64000, 128000 ]
231 enum: [ 1, 2, 4, 8, 16 ]
234 additionalProperties: false
239 #address-cells = <1>;
243 compatible = "qcom,spmi-vadc";
245 interrupts = <0x0 0x31 0x0 0x1>;
246 #address-cells = <1>;
248 #io-channel-cells = <1>;
253 qcom,decimation = <512>;
255 qcom,hw-settle-time = <200>;
256 qcom,avg-samples = <1>;
257 qcom,pre-scaling = <1 3>;
279 #include <dt-bindings/iio/qcom,spmi-adc7-pmk8350.h>
280 #include <dt-bindings/iio/qcom,spmi-adc7-pm8350.h>
281 #include <dt-bindings/interrupt-controller/irq.h>
284 #address-cells = <1>;
289 compatible = "qcom,spmi-adc7";
290 #address-cells = <1>;
292 #io-channel-cells = <1>;
294 /* Other properties are omitted */
296 reg = <PMK8350_ADC7_AMUX_THM1_100K_PU>;
298 qcom,hw-settle-time = <200>;
303 reg = <PM8350_ADC7_AMUX_THM4_100K_PU(1)>;
305 qcom,hw-settle-time = <200>;
306 label = "conn_therm";