| # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) |
| %YAML 1.2 |
| --- |
| $id: "http://devicetree.org/schemas/iio/adc/st,stm32-adc.yaml#" |
| $schema: "http://devicetree.org/meta-schemas/core.yaml#" |
| |
| title: STMicroelectronics STM32 ADC bindings |
| |
| description: | |
| STM32 ADC is a successive approximation analog-to-digital converter. |
| It has several multiplexed input channels. Conversions can be performed |
| in single, continuous, scan or discontinuous mode. Result of the ADC is |
| stored in a left-aligned or right-aligned 32-bit data register. |
| Conversions can be launched in software or using hardware triggers. |
| |
| The analog watchdog feature allows the application to detect if the input |
| voltage goes beyond the user-defined, higher or lower thresholds. |
| |
| Each STM32 ADC block can have up to 3 ADC instances. |
| |
| maintainers: |
| - Fabrice Gasnier <fabrice.gasnier@st.com> |
| |
| properties: |
| compatible: |
| enum: |
| - st,stm32f4-adc-core |
| - st,stm32h7-adc-core |
| - st,stm32mp1-adc-core |
| |
| reg: |
| maxItems: 1 |
| |
| interrupts: |
| description: | |
| One or more interrupts for ADC block, depending on part used: |
| - stm32f4 and stm32h7 share a common ADC interrupt line. |
| - stm32mp1 has two separate interrupt lines, one for each ADC within |
| ADC block. |
| minItems: 1 |
| maxItems: 2 |
| |
| clocks: |
| description: | |
| Core can use up to two clocks, depending on part used: |
| - "adc" clock: for the analog circuitry, common to all ADCs. |
| It's required on stm32f4. |
| It's optional on stm32h7 and stm32mp1. |
| - "bus" clock: for registers access, common to all ADCs. |
| It's not present on stm32f4. |
| It's required on stm32h7 and stm32mp1. |
| |
| clock-names: true |
| |
| st,max-clk-rate-hz: |
| description: |
| Allow to specify desired max clock rate used by analog circuitry. |
| |
| vdda-supply: |
| description: Phandle to the vdda input analog voltage. |
| |
| vref-supply: |
| description: Phandle to the vref input analog reference voltage. |
| |
| booster-supply: |
| description: |
| Phandle to the embedded booster regulator that can be used to supply ADC |
| analog input switches on stm32h7 and stm32mp1. |
| |
| vdd-supply: |
| description: |
| Phandle to the vdd input voltage. It can be used to supply ADC analog |
| input switches on stm32mp1. |
| |
| st,syscfg: |
| description: |
| Phandle to system configuration controller. It can be used to control the |
| analog circuitry on stm32mp1. |
| $ref: "/schemas/types.yaml#/definitions/phandle-array" |
| |
| interrupt-controller: true |
| |
| '#interrupt-cells': |
| const: 1 |
| |
| '#address-cells': |
| const: 1 |
| |
| '#size-cells': |
| const: 0 |
| |
| allOf: |
| - if: |
| properties: |
| compatible: |
| contains: |
| const: st,stm32f4-adc-core |
| |
| then: |
| properties: |
| clocks: |
| maxItems: 1 |
| |
| clock-names: |
| const: adc |
| |
| interrupts: |
| items: |
| - description: interrupt line common for all ADCs |
| |
| st,max-clk-rate-hz: |
| minimum: 600000 |
| maximum: 36000000 |
| default: 36000000 |
| |
| booster-supply: false |
| |
| vdd-supply: false |
| |
| st,syscfg: false |
| |
| - if: |
| properties: |
| compatible: |
| contains: |
| const: st,stm32h7-adc-core |
| |
| then: |
| properties: |
| clocks: |
| minItems: 1 |
| maxItems: 2 |
| |
| clock-names: |
| items: |
| - const: bus |
| - const: adc |
| minItems: 1 |
| maxItems: 2 |
| |
| interrupts: |
| items: |
| - description: interrupt line common for all ADCs |
| |
| st,max-clk-rate-hz: |
| minimum: 120000 |
| maximum: 36000000 |
| default: 36000000 |
| |
| vdd-supply: false |
| |
| st,syscfg: false |
| |
| - if: |
| properties: |
| compatible: |
| contains: |
| const: st,stm32mp1-adc-core |
| |
| then: |
| properties: |
| clocks: |
| minItems: 1 |
| maxItems: 2 |
| |
| clock-names: |
| items: |
| - const: bus |
| - const: adc |
| minItems: 1 |
| maxItems: 2 |
| |
| interrupts: |
| items: |
| - description: interrupt line for ADC1 |
| - description: interrupt line for ADC2 |
| |
| st,max-clk-rate-hz: |
| minimum: 120000 |
| maximum: 36000000 |
| default: 36000000 |
| |
| additionalProperties: false |
| |
| required: |
| - compatible |
| - reg |
| - interrupts |
| - clocks |
| - clock-names |
| - vdda-supply |
| - vref-supply |
| - interrupt-controller |
| - '#interrupt-cells' |
| - '#address-cells' |
| - '#size-cells' |
| |
| patternProperties: |
| "^adc@[0-9]+$": |
| type: object |
| description: |
| An ADC block node should contain at least one subnode, representing an |
| ADC instance available on the machine. |
| |
| properties: |
| compatible: |
| enum: |
| - st,stm32f4-adc |
| - st,stm32h7-adc |
| - st,stm32mp1-adc |
| |
| reg: |
| description: | |
| Offset of ADC instance in ADC block. Valid values are: |
| - 0x0: ADC1 |
| - 0x100: ADC2 |
| - 0x200: ADC3 (stm32f4 only) |
| maxItems: 1 |
| |
| '#io-channel-cells': |
| const: 1 |
| |
| interrupts: |
| description: | |
| IRQ Line for the ADC instance. Valid values are: |
| - 0 for adc@0 |
| - 1 for adc@100 |
| - 2 for adc@200 (stm32f4 only) |
| maxItems: 1 |
| |
| clocks: |
| description: |
| Input clock private to this ADC instance. It's required only on |
| stm32f4, that has per instance clock input for registers access. |
| maxItems: 1 |
| |
| dmas: |
| description: RX DMA Channel |
| maxItems: 1 |
| |
| dma-names: |
| const: rx |
| |
| assigned-resolution-bits: |
| description: | |
| Resolution (bits) to use for conversions: |
| - can be 6, 8, 10 or 12 on stm32f4 |
| - can be 8, 10, 12, 14 or 16 on stm32h7 and stm32mp1 |
| $ref: /schemas/types.yaml#/definitions/uint32 |
| |
| st,adc-channels: |
| description: | |
| List of single-ended channels muxed for this ADC. It can have up to: |
| - 16 channels, numbered from 0 to 15 (for in0..in15) on stm32f4 |
| - 20 channels, numbered from 0 to 19 (for in0..in19) on stm32h7 and |
| stm32mp1. |
| $ref: /schemas/types.yaml#/definitions/uint32-array |
| |
| st,adc-diff-channels: |
| description: | |
| List of differential channels muxed for this ADC. Some channels can |
| be configured as differential instead of single-ended on stm32h7 and |
| on stm32mp1. Positive and negative inputs pairs are listed: |
| <vinp vinn>, <vinp vinn>,... vinp and vinn are numbered from 0 to 19. |
| |
| Note: At least one of "st,adc-channels" or "st,adc-diff-channels" is |
| required. Both properties can be used together. Some channels can be |
| used as single-ended and some other ones as differential (mixed). But |
| channels can't be configured both as single-ended and differential. |
| $ref: /schemas/types.yaml#/definitions/uint32-matrix |
| items: |
| items: |
| - description: | |
| "vinp" indicates positive input number |
| minimum: 0 |
| maximum: 19 |
| - description: | |
| "vinn" indicates negative input number |
| minimum: 0 |
| maximum: 19 |
| |
| st,min-sample-time-nsecs: |
| description: |
| Minimum sampling time in nanoseconds. Depending on hardware (board) |
| e.g. high/low analog input source impedance, fine tune of ADC |
| sampling time may be recommended. This can be either one value or an |
| array that matches "st,adc-channels" and/or "st,adc-diff-channels" |
| list, to set sample time resp. for all channels, or independently for |
| each channel. |
| $ref: /schemas/types.yaml#/definitions/uint32-array |
| |
| allOf: |
| - if: |
| properties: |
| compatible: |
| contains: |
| const: st,stm32f4-adc |
| |
| then: |
| properties: |
| reg: |
| enum: |
| - 0x0 |
| - 0x100 |
| - 0x200 |
| |
| interrupts: |
| minimum: 0 |
| maximum: 2 |
| |
| assigned-resolution-bits: |
| enum: [6, 8, 10, 12] |
| default: 12 |
| |
| st,adc-channels: |
| minItems: 1 |
| maxItems: 16 |
| items: |
| minimum: 0 |
| maximum: 15 |
| |
| st,adc-diff-channels: false |
| |
| st,min-sample-time-nsecs: |
| minItems: 1 |
| maxItems: 16 |
| items: |
| minimum: 80 |
| |
| required: |
| - clocks |
| |
| - if: |
| properties: |
| compatible: |
| contains: |
| enum: |
| - st,stm32h7-adc |
| - st,stm32mp1-adc |
| |
| then: |
| properties: |
| reg: |
| enum: |
| - 0x0 |
| - 0x100 |
| |
| interrupts: |
| minimum: 0 |
| maximum: 1 |
| |
| assigned-resolution-bits: |
| enum: [8, 10, 12, 14, 16] |
| default: 16 |
| |
| st,adc-channels: |
| minItems: 1 |
| maxItems: 20 |
| items: |
| minimum: 0 |
| maximum: 19 |
| |
| st,min-sample-time-nsecs: |
| minItems: 1 |
| maxItems: 20 |
| items: |
| minimum: 40 |
| |
| additionalProperties: false |
| |
| anyOf: |
| - required: |
| - st,adc-channels |
| - required: |
| - st,adc-diff-channels |
| |
| required: |
| - compatible |
| - reg |
| - interrupts |
| - '#io-channel-cells' |
| |
| examples: |
| - | |
| // Example 1: with stm32f429, ADC1, single-ended channel 8 |
| adc123: adc@40012000 { |
| compatible = "st,stm32f4-adc-core"; |
| reg = <0x40012000 0x400>; |
| interrupts = <18>; |
| clocks = <&rcc 0 168>; |
| clock-names = "adc"; |
| st,max-clk-rate-hz = <36000000>; |
| vdda-supply = <&vdda>; |
| vref-supply = <&vref>; |
| interrupt-controller; |
| #interrupt-cells = <1>; |
| #address-cells = <1>; |
| #size-cells = <0>; |
| adc@0 { |
| compatible = "st,stm32f4-adc"; |
| #io-channel-cells = <1>; |
| reg = <0x0>; |
| clocks = <&rcc 0 168>; |
| interrupt-parent = <&adc123>; |
| interrupts = <0>; |
| st,adc-channels = <8>; |
| dmas = <&dma2 0 0 0x400 0x0>; |
| dma-names = "rx"; |
| assigned-resolution-bits = <8>; |
| }; |
| // ... |
| // other adc child nodes follow... |
| }; |
| |
| - | |
| // Example 2: with stm32mp157c to setup ADC1 with: |
| // - channels 0 & 1 as single-ended |
| // - channels 2 & 3 as differential (with resp. 6 & 7 negative inputs) |
| #include <dt-bindings/interrupt-controller/arm-gic.h> |
| #include <dt-bindings/clock/stm32mp1-clks.h> |
| adc12: adc@48003000 { |
| compatible = "st,stm32mp1-adc-core"; |
| reg = <0x48003000 0x400>; |
| interrupts = <GIC_SPI 18 IRQ_TYPE_LEVEL_HIGH>, |
| <GIC_SPI 90 IRQ_TYPE_LEVEL_HIGH>; |
| clocks = <&rcc ADC12>, <&rcc ADC12_K>; |
| clock-names = "bus", "adc"; |
| booster-supply = <&booster>; |
| vdd-supply = <&vdd>; |
| vdda-supply = <&vdda>; |
| vref-supply = <&vref>; |
| st,syscfg = <&syscfg>; |
| interrupt-controller; |
| #interrupt-cells = <1>; |
| #address-cells = <1>; |
| #size-cells = <0>; |
| adc@0 { |
| compatible = "st,stm32mp1-adc"; |
| #io-channel-cells = <1>; |
| reg = <0x0>; |
| interrupt-parent = <&adc12>; |
| interrupts = <0>; |
| st,adc-channels = <0 1>; |
| st,adc-diff-channels = <2 6>, <3 7>; |
| st,min-sample-time-nsecs = <5000>; |
| dmas = <&dmamux1 9 0x400 0x05>; |
| dma-names = "rx"; |
| }; |
| // ... |
| // other adc child node follow... |
| }; |
| |
| ... |
