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-Qualcomm's SPMI PMIC ADC
-
-- SPMI PMIC voltage ADC (VADC) provides interface to clients to read
- voltage. The VADC is a 15-bit sigma-delta ADC.
-- SPMI PMIC5 voltage ADC (ADC) provides interface to clients to read
- voltage. The VADC is a 16-bit sigma-delta ADC.
-
-VADC node:
-
-- compatible:
- Usage: required
- Value type: <string>
- Definition: Should contain "qcom,spmi-vadc".
- Should contain "qcom,spmi-adc5" for PMIC5 ADC driver.
- Should contain "qcom,spmi-adc-rev2" for PMIC rev2 ADC driver.
- Should contain "qcom,pms405-adc" for PMS405 PMIC
-
-- reg:
- Usage: required
- Value type: <prop-encoded-array>
- Definition: VADC base address in the SPMI PMIC register map.
-
-- #address-cells:
- Usage: required
- Value type: <u32>
- Definition: Must be one. Child node 'reg' property should define ADC
- channel number.
-
-- #size-cells:
- Usage: required
- Value type: <u32>
- Definition: Must be zero.
-
-- #io-channel-cells:
- Usage: required
- Value type: <u32>
- Definition: Must be one. For details about IIO bindings see:
- Documentation/devicetree/bindings/iio/iio-bindings.txt
-
-- interrupts:
- Usage: optional
- Value type: <prop-encoded-array>
- Definition: End of conversion interrupt.
-
-Channel node properties:
-
-- reg:
- Usage: required
- Value type: <u32>
- Definition: ADC channel number.
- See include/dt-bindings/iio/qcom,spmi-vadc.h
-
-- label:
- Usage: required for "qcom,spmi-adc5" and "qcom,spmi-adc-rev2"
- Value type: <empty>
- Definition: ADC input of the platform as seen in the schematics.
- For thermistor inputs connected to generic AMUX or GPIO inputs
- these can vary across platform for the same pins. Hence select
- the platform schematics name for this channel.
-
-- qcom,decimation:
- Usage: optional
- Value type: <u32>
- Definition: This parameter is used to decrease ADC sampling rate.
- Quicker measurements can be made by reducing decimation ratio.
- - For compatible property "qcom,spmi-vadc", valid values are
- 512, 1024, 2048, 4096. If property is not found, default value
- of 512 will be used.
- - For compatible property "qcom,spmi-adc5", valid values are 250, 420
- and 840. If property is not found, default value of 840 is used.
- - For compatible property "qcom,spmi-adc-rev2", valid values are 256,
- 512 and 1024. If property is not present, default value is 1024.
-
-- qcom,pre-scaling:
- Usage: optional
- Value type: <u32 array>
- Definition: Used for scaling the channel input signal before the signal is
- fed to VADC. The configuration for this node is to know the
- pre-determined ratio and use it for post scaling. Select one from
- the following options.
- <1 1>, <1 3>, <1 4>, <1 6>, <1 20>, <1 8>, <10 81>, <1 10>
- If property is not found default value depending on chip will be used.
-
-- qcom,ratiometric:
- Usage: optional
- Value type: <empty>
- Definition: Channel calibration type.
- - For compatible property "qcom,spmi-vadc", if this property is
- specified VADC will use the VDD reference (1.8V) and GND for
- channel calibration. If property is not found, channel will be
- calibrated with 0.625V and 1.25V reference channels, also
- known as absolute calibration.
- - For compatible property "qcom,spmi-adc5" and "qcom,spmi-adc-rev2",
- if this property is specified VADC will use the VDD reference
- (1.875V) and GND for channel calibration. If property is not found,
- channel will be calibrated with 0V and 1.25V reference channels,
- also known as absolute calibration.
-
-- qcom,hw-settle-time:
- Usage: optional
- Value type: <u32>
- Definition: Time between AMUX getting configured and the ADC starting
- conversion. The 'hw_settle_time' is an index used from valid values
- and programmed in hardware to achieve the hardware settling delay.
- - For compatible property "qcom,spmi-vadc" and "qcom,spmi-adc-rev2",
- Delay = 100us * (hw_settle_time) for hw_settle_time < 11,
- and 2ms * (hw_settle_time - 10) otherwise.
- Valid values are: 0, 100, 200, 300, 400, 500, 600, 700, 800,
- 900 us and 1, 2, 4, 6, 8, 10 ms.
- If property is not found, channel will use 0us.
- - For compatible property "qcom,spmi-adc5", delay = 15us for
- value 0, 100us * (value) for values < 11,
- and 2ms * (value - 10) otherwise.
- Valid values are: 15, 100, 200, 300, 400, 500, 600, 700, 800,
- 900 us and 1, 2, 4, 6, 8, 10 ms
- Certain controller digital versions have valid values of
- 15, 100, 200, 300, 400, 500, 600, 700, 1, 2, 4, 8, 16, 32, 64, 128 ms
- If property is not found, channel will use 15us.
-
-- qcom,avg-samples:
- Usage: optional
- Value type: <u32>
- Definition: Number of samples to be used for measurement.
- Averaging provides the option to obtain a single measurement
- from the ADC that is an average of multiple samples. The value
- selected is 2^(value).
- - For compatible property "qcom,spmi-vadc", valid values
- are: 1, 2, 4, 8, 16, 32, 64, 128, 256, 512
- If property is not found, 1 sample will be used.
- - For compatible property "qcom,spmi-adc5" and "qcom,spmi-adc-rev2",
- valid values are: 1, 2, 4, 8, 16
- If property is not found, 1 sample will be used.
-
-NOTE:
-
-For compatible property "qcom,spmi-vadc" following channels, also known as
-reference point channels, are used for result calibration and their channel
-configuration nodes should be defined:
-VADC_REF_625MV and/or VADC_SPARE1(based on PMIC version) VADC_REF_1250MV,
-VADC_GND_REF and VADC_VDD_VADC.
-
-Example:
-
-#include <dt-bindings/iio/qcom,spmi-vadc.h>
-#include <linux/irq.h>
-/* ... */
-
- /* VADC node */
- pmic_vadc: vadc@3100 {
- compatible = "qcom,spmi-vadc";
- reg = <0x3100>;
- interrupts = <0x0 0x31 0x0 IRQ_TYPE_EDGE_RISING>;
- #address-cells = <1>;
- #size-cells = <0>;
- #io-channel-cells = <1>;
- io-channel-ranges;
-
- /* Channel node */
- adc-chan@VADC_LR_MUX10_USB_ID {
- reg = <VADC_LR_MUX10_USB_ID>;
- qcom,decimation = <512>;
- qcom,ratiometric;
- qcom,hw-settle-time = <200>;
- qcom,avg-samples = <1>;
- qcom,pre-scaling = <1 3>;
- };
- };
-
- /* IIO client node */
- usb {
- io-channels = <&pmic_vadc VADC_LR_MUX10_USB_ID>;
- io-channel-names = "vadc";
- };
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+# SPDX-License-Identifier: GPL-2.0-only
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/adc/qcom,spmi-vadc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Qualcomm's SPMI PMIC ADC
+
+maintainers:
+ - Andy Gross <agross@kernel.org>
+ - Bjorn Andersson <bjorn.andersson@linaro.org>
+
+description: |
+ SPMI PMIC voltage ADC (VADC) provides interface to clients to read
+ voltage. The VADC is a 15-bit sigma-delta ADC.
+ SPMI PMIC5 voltage ADC (ADC) provides interface to clients to read
+ voltage. The VADC is a 16-bit sigma-delta ADC.
+
+properties:
+ compatible:
+ oneOf:
+ - items:
+ - const: qcom,pms405-adc
+ - const: qcom,spmi-adc-rev2
+
+ - items:
+ - enum:
+ - qcom,spmi-vadc
+ - qcom,spmi-adc5
+ - qcom,spmi-adc-rev2
+
+ reg:
+ description: VADC base address in the SPMI PMIC register map
+ maxItems: 1
+
+ '#address-cells':
+ const: 1
+
+ '#size-cells':
+ const: 0
+
+ '#io-channel-cells':
+ const: 1
+
+ interrupts:
+ maxItems: 1
+ description:
+ End of conversion interrupt.
+
+required:
+ - compatible
+ - reg
+ - '#address-cells'
+ - '#size-cells'
+ - '#io-channel-cells'
+
+patternProperties:
+ "^.*@[0-9a-f]+$":
+ type: object
+ description: |
+ Represents the external channels which are connected to the ADC.
+ For compatible property "qcom,spmi-vadc" following channels, also known as
+ reference point channels, are used for result calibration and their channel
+ configuration nodes should be defined:
+ VADC_REF_625MV and/or VADC_SPARE1(based on PMIC version) VADC_REF_1250MV,
+ VADC_GND_REF and VADC_VDD_VADC.
+
+ properties:
+ reg:
+ description: |
+ ADC channel number.
+ See include/dt-bindings/iio/qcom,spmi-vadc.h
+
+ label:
+ $ref: /schemas/types.yaml#/definitions/string
+ description: |
+ ADC input of the platform as seen in the schematics.
+ For thermistor inputs connected to generic AMUX or GPIO inputs
+ these can vary across platform for the same pins. Hence select
+ the platform schematics name for this channel.
+
+ qcom,decimation:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description: |
+ This parameter is used to decrease ADC sampling rate.
+ Quicker measurements can be made by reducing decimation ratio.
+
+ qcom,pre-scaling:
+ description: |
+ Used for scaling the channel input signal before the signal is
+ fed to VADC. The configuration for this node is to know the
+ pre-determined ratio and use it for post scaling. It is a pair of
+ integers, denoting the numerator and denominator of the fraction by which
+ input signal is multiplied. For example, <1 3> indicates the signal is scaled
+ down to 1/3 of its value before ADC measurement.
+ If property is not found default value depending on chip will be used.
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32-array
+ oneOf:
+ - items:
+ - const: 1
+ - enum: [ 1, 3, 4, 6, 20, 8, 10 ]
+
+ - items:
+ - const: 10
+ - const: 81
+
+ qcom,ratiometric:
+ description: |
+ Channel calibration type.
+ - For compatible property "qcom,spmi-vadc", if this property is
+ specified VADC will use the VDD reference (1.8V) and GND for
+ channel calibration. If property is not found, channel will be
+ calibrated with 0.625V and 1.25V reference channels, also
+ known as absolute calibration.
+ - For compatible property "qcom,spmi-adc5" and "qcom,spmi-adc-rev2",
+ if this property is specified VADC will use the VDD reference (1.875V)
+ and GND for channel calibration. If property is not found, channel
+ will be calibrated with 0V and 1.25V reference channels, also known
+ as absolute calibration.
+ type: boolean
+
+ qcom,hw-settle-time:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description: |
+ Time between AMUX getting configured and the ADC starting
+ conversion. The 'hw_settle_time' is an index used from valid values
+ and programmed in hardware to achieve the hardware settling delay.
+
+ qcom,avg-samples:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description: |
+ Number of samples to be used for measurement.
+ Averaging provides the option to obtain a single measurement
+ from the ADC that is an average of multiple samples. The value
+ selected is 2^(value).
+
+ required:
+ - reg
+
+allOf:
+ - if:
+ properties:
+ compatible:
+ contains:
+ const: qcom,spmi-vadc
+
+ then:
+ patternProperties:
+ "^.*@[0-9a-f]+$":
+ properties:
+ qcom,decimation:
+ enum: [ 512, 1024, 2048, 4096 ]
+ default: 512
+
+ qcom,hw-settle-time:
+ enum: [ 0, 100, 200, 300, 400, 500, 600, 700, 800, 900, 1, 2,
+ 4, 6, 8, 10 ]
+ default: 0
+
+ qcom,avg-samples:
+ enum: [ 1, 2, 4, 8, 16, 32, 64, 128, 256, 512 ]
+ default: 1
+
+ - if:
+ properties:
+ compatible:
+ contains:
+ const: qcom,spmi-adc-rev2
+
+ then:
+ patternProperties:
+ "^.*@[0-9a-f]+$":
+ properties:
+ qcom,decimation:
+ enum: [ 256, 512, 1024 ]
+ default: 1024
+
+ qcom,hw-settle-time:
+ enum: [ 0, 100, 200, 300, 400, 500, 600, 700, 800, 900, 1, 2,
+ 4, 6, 8, 10 ]
+ default: 0
+
+ qcom,avg-samples:
+ enum: [ 1, 2, 4, 8, 16 ]
+ default: 1
+
+ - if:
+ properties:
+ compatible:
+ contains:
+ const: qcom,spmi-adc5
+
+ then:
+ patternProperties:
+ "^.*@[0-9a-f]+$":
+ properties:
+ qcom,decimation:
+ enum: [ 250, 420, 840 ]
+ default: 840
+
+ qcom,hw-settle-time:
+ enum: [ 15, 100, 200, 300, 400, 500, 600, 700, 800, 900, 1, 2,
+ 4, 6, 8, 10, 16, 32, 64, 128 ]
+ default: 15
+
+ qcom,avg-samples:
+ enum: [ 1, 2, 4, 8, 16 ]
+ default: 1
+
+examples:
+ - |
+ spmi_bus {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ /* VADC node */
+ pmic_vadc: adc@3100 {
+ compatible = "qcom,spmi-vadc";
+ reg = <0x3100>;
+ interrupts = <0x0 0x31 0x0 0x1>;
+ #address-cells = <1>;
+ #size-cells = <0>;
+ #io-channel-cells = <1>;
+ io-channel-ranges;
+
+ /* Channel node */
+ adc-chan@39 {
+ reg = <0x39>;
+ qcom,decimation = <512>;
+ qcom,ratiometric;
+ qcom,hw-settle-time = <200>;
+ qcom,avg-samples = <1>;
+ qcom,pre-scaling = <1 3>;
+ };
+
+ adc-chan@9 {
+ reg = <0x9>;
+ };
+
+ adc-chan@a {
+ reg = <0xa>;
+ };
+
+ adc-chan@e {
+ reg = <0xe>;
+ };
+
+ adc-chan@f {
+ reg = <0xf>;
+ };
+ };
+ };