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st,stm32-adc

Note

An implementation of a driver matching this compatible is available in drivers/adc/adc_stm32.c.

Description

ST STM32 family ADC

Properties

Top level properties

These property descriptions apply to “st,stm32-adc” nodes themselves. This page also describes child node properties in the following sections.

Properties not inherited from the base binding file.

Name	Type	Details
`#io-channel-cells`	`int`	This property is required. Constant value: `1`
`st,adc-clock-source`	`int`	Type of ADC clock source : - <SYNC>: derived from the bus clock. - <ASYNC> : independent and asynchronous with the bus clock One of the two values may not apply to some series. Refer to the RefMan. If an asynchronous clock is selected, a domain clock in the clock property has to be defined explicitly. This property is required. Legal values: `1`, `2`
`st,adc-prescaler`	`int`	Clock prescaler at the input of the ADC: Apply to synchronous or asynchronous clock depending on the STM32 st,adc-clock-source. Some of the values may not apply to some series, and may depend on the selected clock source. Refer to the RefMan. On STM32F3x (except STM32F37x), this configures only the synchronous prescaler (see properties adcXX-prescaler in st,stm32f3-rcc bindings to set asynchronous prescaler). This property is required. Legal values: `1`, `2`, `4`, `6`, `8`, `10`, `12`, `16`, `32`, `64`, `128`, `256`
`vref-mv`	`int`	Indicates the reference voltage of the ADC in mV (on the target board). Default value: `3300`
`resolutions`	`array`	List of the resolutions supported by the ADC instance. They should be values created with STM32_ADC_RES macro or similar. Their order is not important. For example for STM32F4: <STM32_ADC_RES(12, 0x00) STM32_ADC_RES(10, 0x01) STM32_ADC_RES(8, 0x02) STM32_ADC_RES(6, 0x03)> The two parameters are the resolution (for example 10 bits) and the corresponding register value (0x01 for a 10-bit resolution). By design, these macros also contains all register information (address, field offset and field mask) necessary to properly set the resolution. This property is required.
`sampling-times`	`array`	List all the sampling times supported by the ADC instance. Rounded up if needed. Order is important: their index matches their binary value in the register. This property is required.
`num-sampling-time-common-channels`	`int`	Number of sampling time common channels for this ADC instance, if any.
`st,adc-sequencer`	`int`	Type of ADC sequencer: - <NOT_FULLY_CONFIGURABLE>: Not fully configurable sequencer - <FULLY_CONFIGURABLE>: Fully configurable sequencer This property is required. Legal values: `0`, `1`
`pinctrl-0`	`phandles`	Pin configuration/s for the first state. Content is specific to the selected pin controller driver implementation.
`pinctrl-1`	`phandles`	Pin configuration/s for the second state. See pinctrl-0.
`pinctrl-2`	`phandles`	Pin configuration/s for the third state. See pinctrl-0.
`pinctrl-3`	`phandles`	Pin configuration/s for the fourth state. See pinctrl-0.
`pinctrl-4`	`phandles`	Pin configuration/s for the fifth state. See pinctrl-0.
`pinctrl-names`	`string-array`	Names for the provided states. The number of names needs to match the number of states.

Properties inherited from the base binding file, which defines common properties that may be set on many nodes. Not all of these may apply to the “st,stm32-adc” compatible.

Name	Type	Details
`reg`	`array`	register space This property is required. See Important properties for more information.
`clocks`	`phandle-array`	Clock gate information This property is required.
`interrupts`	`array`	interrupts for device This property is required. See Important properties for more information.
`#address-cells`	`int`	number of address cells in reg property Constant value: `1`
`#size-cells`	`int`	number of size cells in reg property
`status`	`string`	indicates the operational status of a device Legal values: `'ok'`, `'okay'`, `'disabled'`, `'reserved'`, `'fail'`, `'fail-sss'` See Important properties for more information.
`compatible`	`string-array`	compatible strings This property is required. See Important properties for more information.
`reg-names`	`string-array`	name of each register space
`interrupts-extended`	`compound`	extended interrupt specifier for device
`interrupt-names`	`string-array`	name of each interrupt
`interrupt-parent`	`phandle`	phandle to interrupt controller node
`label`	`string`	Human readable string describing the device (used as device_get_binding() argument) See Important properties for more information. This property is deprecated.
`clock-names`	`string-array`	name of each clock
`dmas`	`phandle-array`	DMA channels specifiers
`dma-names`	`string-array`	Provided names of DMA channel specifiers
`io-channels`	`phandle-array`	IO channels specifiers
`io-channel-names`	`string-array`	Provided names of IO channel specifiers
`mboxes`	`phandle-array`	mailbox / IPM channels specifiers
`mbox-names`	`string-array`	Provided names of mailbox / IPM channel specifiers
`power-domains`	`phandle-array`	Power domain specifiers
`power-domain-names`	`string-array`	Provided names of power domain specifiers
`#power-domain-cells`	`int`	Number of cells in power-domains property
`zephyr,deferred-init`	`boolean`	Do not initialize device automatically on boot. Device should be manually initialized using device_init().
`wakeup-source`	`boolean`	Property to identify that a device can be used as wake up source. When this property is provided a specific flag is set into the device that tells the system that the device is capable of wake up the system. Wake up capable devices are disabled (interruptions will not wake up the system) by default but they can be enabled at runtime if necessary.
`zephyr,pm-device-runtime-auto`	`boolean`	Automatically configure the device for runtime power management after the init function runs.
`zephyr,disabling-power-states`	`phandles`	List of power states that will disable this device power.

Child node properties

Name	Type	Details
`reg`	`array`	Channel identifier. This property is required. See Important properties for more information.
`zephyr,gain`	`string`	Gain selection: - ADC_GAIN_1_6: x 1/6 - ADC_GAIN_1_5: x 1/5 - ADC_GAIN_1_4: x 1/4 - ADC_GAIN_1_3: x 1/3 - ADC_GAIN_2_5: x 2/5 - ADC_GAIN_1_2: x 1/2 - ADC_GAIN_2_3: x 2/3 - ADC_GAIN_4_5: x 4/5 - ADC_GAIN_1: x 1 - ADC_GAIN_2: x 2 - ADC_GAIN_3: x 3 - ADC_GAIN_4: x 4 - ADC_GAIN_6: x 6 - ADC_GAIN_8: x 8 - ADC_GAIN_12: x 12 - ADC_GAIN_16: x 16 - ADC_GAIN_24: x 24 - ADC_GAIN_32: x 32 - ADC_GAIN_64: x 64 - ADC_GAIN_128: x 128 This property is required. Legal values: `'ADC_GAIN_1_6'`, `'ADC_GAIN_1_5'`, `'ADC_GAIN_1_4'`, `'ADC_GAIN_1_3'`, `'ADC_GAIN_2_5'`, `'ADC_GAIN_1_2'`, `'ADC_GAIN_2_3'`, `'ADC_GAIN_4_5'`, `'ADC_GAIN_1'`, `'ADC_GAIN_2'`, `'ADC_GAIN_3'`, `'ADC_GAIN_4'`, `'ADC_GAIN_6'`, `'ADC_GAIN_8'`, `'ADC_GAIN_12'`, `'ADC_GAIN_16'`, `'ADC_GAIN_24'`, `'ADC_GAIN_32'`, `'ADC_GAIN_64'`, `'ADC_GAIN_128'`
`zephyr,reference`	`string`	Reference selection: - ADC_REF_VDD_1: VDD - ADC_REF_VDD_1_2: VDD/2 - ADC_REF_VDD_1_3: VDD/3 - ADC_REF_VDD_1_4: VDD/4 - ADC_REF_INTERNAL: Internal - ADC_REF_EXTERNAL0: External, input 0 - ADC_REF_EXTERNAL1: External, input 1 This property is required. Legal values: `'ADC_REF_VDD_1'`, `'ADC_REF_VDD_1_2'`, `'ADC_REF_VDD_1_3'`, `'ADC_REF_VDD_1_4'`, `'ADC_REF_INTERNAL'`, `'ADC_REF_EXTERNAL0'`, `'ADC_REF_EXTERNAL1'`
`zephyr,vref-mv`	`int`	This property can be used to specify the voltage (in millivolts) of the reference selected for this channel, so that applications can get that value if needed for some calculations. For the internal reference, the voltage can be usually obtained with a dedicated ADC API call, so there is no need to use this property in that case, but for other references this property can be useful.
`zephyr,acquisition-time`	`int`	Acquisition time. Use the ADC_ACQ_TIME macro to compose the value for this property or pass ADC_ACQ_TIME_DEFAULT to use the default setting for a given hardware (e.g. when the hardware does not allow to configure the acquisition time). This property is required.
`zephyr,differential`	`boolean`	When set, selects differential input mode for the channel. Otherwise, single-ended mode is used unless the zephyr,input-negative property is specified, in which case the differential mode is selected implicitly.
`zephyr,input-positive`	`int`	Positive ADC input. Used only for drivers that select the ADC_CONFIGURABLE_INPUTS Kconfig option.
`zephyr,input-negative`	`int`	Negative ADC input. Used only for drivers that select the ADC_CONFIGURABLE_INPUTS Kconfig option. When specified, implies the differential input mode for the channel.
`zephyr,resolution`	`int`	ADC resolution to be used for the channel.
`zephyr,oversampling`	`int`	Oversampling setting to be used for the channel. When specified, each sample is averaged from 2^N conversion results (where N is the provided value).
`zephyr,current-source-pin`	`uint8-array`	Output pin selection for the current sources. The actual interpretation depends on the driver. This is used only for drivers which select the ADC_CONFIGURABLE_EXCITATION_CURRENT_SOURCE_PIN Kconfig option.
`zephyr,vbias-pins`	`int`	Output pin selection for the bias voltage. The actual interpretation depends on the driver. This is used only for drivers which select the ADC_CONFIGURABLE_VBIAS_PIN Kconfig option.

Specifier cell names

io-channel cells: input