| # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) |
| %YAML 1.2 |
| --- |
| $id: http://devicetree.org/schemas/iio/adc/st,stm32-dfsdm-adc.yaml# |
| $schema: http://devicetree.org/meta-schemas/core.yaml# |
| |
| title: STMicroelectronics STM32 DFSDM ADC device driver |
| |
| maintainers: |
| - Fabrice Gasnier <fabrice.gasnier@foss.st.com> |
| - Olivier Moysan <olivier.moysan@foss.st.com> |
| |
| description: | |
| STM32 DFSDM ADC is a sigma delta analog-to-digital converter dedicated to |
| interface external sigma delta modulators to STM32 micro controllers. |
| It is mainly targeted for: |
| - Sigma delta modulators (motor control, metering...) |
| - PDM microphones (audio digital microphone) |
| |
| It features up to 8 serial digital interfaces (SPI or Manchester) and |
| up to 4 filters on stm32h7 or 6 filters on stm32mp1. |
| |
| Each child node matches with a filter instance. |
| |
| properties: |
| compatible: |
| enum: |
| - st,stm32h7-dfsdm |
| - st,stm32mp1-dfsdm |
| |
| reg: |
| maxItems: 1 |
| |
| clocks: |
| items: |
| - description: |
| Internal clock used for DFSDM digital processing and control blocks. |
| dfsdm clock can also feed CLKOUT, when CLKOUT is used. |
| - description: audio clock can be used as an alternate to feed CLKOUT. |
| minItems: 1 |
| |
| clock-names: |
| items: |
| - const: dfsdm |
| - const: audio |
| minItems: 1 |
| |
| "#address-cells": |
| const: 1 |
| |
| "#size-cells": |
| const: 0 |
| |
| spi-max-frequency: |
| description: |
| SPI clock OUT frequency (Hz). Requested only for SPI master mode. |
| This clock must be set according to the "clock" property. |
| Frequency must be a multiple of the rcc clock frequency. |
| If not, SPI CLKOUT frequency will not be accurate. |
| maximum: 20000000 |
| |
| required: |
| - compatible |
| - reg |
| - clocks |
| - clock-names |
| - "#address-cells" |
| - "#size-cells" |
| |
| additionalProperties: false |
| |
| patternProperties: |
| "^filter@[0-9]+$": |
| type: object |
| unevaluatedProperties: false |
| description: child node |
| |
| properties: |
| compatible: |
| enum: |
| - st,stm32-dfsdm-adc |
| - st,stm32-dfsdm-dmic |
| |
| reg: |
| description: Specifies the DFSDM filter instance used. |
| maxItems: 1 |
| |
| interrupts: |
| maxItems: 1 |
| |
| st,adc-channels: |
| description: | |
| List of single-ended channels muxed for this ADC. |
| On stm32h7 and stm32mp1: |
| - For st,stm32-dfsdm-adc: up to 8 channels numbered from 0 to 7. |
| - For st,stm32-dfsdm-dmic: 1 channel numbered from 0 to 7. |
| $ref: /schemas/types.yaml#/definitions/uint32-array |
| items: |
| minimum: 0 |
| maximum: 7 |
| |
| st,adc-channel-names: |
| description: List of single-ended channel names. |
| |
| st,filter-order: |
| description: | |
| SinC filter order from 0 to 5. |
| - 0: FastSinC |
| - [1-5]: order 1 to 5. |
| For audio purpose it is recommended to use order 3 to 5. |
| $ref: /schemas/types.yaml#/definitions/uint32 |
| maximum: 5 |
| |
| "#io-channel-cells": |
| const: 1 |
| |
| st,adc-channel-types: |
| description: | |
| Single-ended channel input type. |
| - "SPI_R": SPI with data on rising edge (default) |
| - "SPI_F": SPI with data on falling edge |
| - "MANCH_R": manchester codec, rising edge = logic 0, falling edge = logic 1 |
| - "MANCH_F": manchester codec, rising edge = logic 1, falling edge = logic 0 |
| items: |
| enum: [ SPI_R, SPI_F, MANCH_R, MANCH_F ] |
| $ref: /schemas/types.yaml#/definitions/non-unique-string-array |
| |
| st,adc-channel-clk-src: |
| description: | |
| Conversion clock source. |
| - "CLKIN": external SPI clock (CLKIN x) |
| - "CLKOUT": internal SPI clock (CLKOUT) (default) |
| - "CLKOUT_F": internal SPI clock divided by 2 (falling edge). |
| - "CLKOUT_R": internal SPI clock divided by 2 (rising edge). |
| items: |
| enum: [ CLKIN, CLKOUT, CLKOUT_F, CLKOUT_R ] |
| $ref: /schemas/types.yaml#/definitions/non-unique-string-array |
| |
| st,adc-alt-channel: |
| description: |
| Must be defined if two sigma delta modulators are |
| connected on same SPI input. |
| If not set, channel n is connected to SPI input n. |
| If set, channel n is connected to SPI input n + 1. |
| type: boolean |
| |
| st,filter0-sync: |
| description: |
| Set to 1 to synchronize with DFSDM filter instance 0. |
| Used for multi microphones synchronization. |
| type: boolean |
| |
| dmas: |
| maxItems: 1 |
| |
| dma-names: |
| items: |
| - const: rx |
| |
| required: |
| - compatible |
| - reg |
| - interrupts |
| - st,adc-channels |
| - st,adc-channel-names |
| - st,filter-order |
| - "#io-channel-cells" |
| |
| allOf: |
| - if: |
| properties: |
| compatible: |
| contains: |
| const: st,stm32-dfsdm-adc |
| |
| then: |
| properties: |
| st,adc-channels: |
| minItems: 1 |
| maxItems: 8 |
| |
| st,adc-channel-names: |
| minItems: 1 |
| maxItems: 8 |
| |
| st,adc-channel-types: |
| minItems: 1 |
| maxItems: 8 |
| |
| st,adc-channel-clk-src: |
| minItems: 1 |
| maxItems: 8 |
| |
| io-channels: |
| description: |
| From common IIO binding. Used to pipe external sigma delta |
| modulator or internal ADC output to DFSDM channel. |
| |
| required: |
| - io-channels |
| |
| - if: |
| properties: |
| compatible: |
| contains: |
| const: st,stm32-dfsdm-dmic |
| |
| then: |
| properties: |
| st,adc-channels: |
| maxItems: 1 |
| |
| st,adc-channel-names: |
| maxItems: 1 |
| |
| st,adc-channel-types: |
| maxItems: 1 |
| |
| st,adc-channel-clk-src: |
| maxItems: 1 |
| |
| required: |
| - dmas |
| - dma-names |
| |
| patternProperties: |
| "^dfsdm-dai+$": |
| type: object |
| additionalProperties: false |
| description: child node |
| |
| properties: |
| compatible: |
| enum: |
| - st,stm32h7-dfsdm-dai |
| |
| "#sound-dai-cells": |
| const: 0 |
| |
| io-channels: |
| description: |
| From common IIO binding. Used to pipe external sigma delta |
| modulator or internal ADC output to DFSDM channel. |
| |
| required: |
| - compatible |
| - "#sound-dai-cells" |
| - io-channels |
| |
| allOf: |
| - if: |
| properties: |
| compatible: |
| contains: |
| const: st,stm32h7-dfsdm |
| |
| then: |
| patternProperties: |
| "^filter@[0-9]+$": |
| properties: |
| reg: |
| items: |
| minimum: 0 |
| maximum: 3 |
| |
| - if: |
| properties: |
| compatible: |
| contains: |
| const: st,stm32mp1-dfsdm |
| |
| then: |
| patternProperties: |
| "^filter@[0-9]+$": |
| properties: |
| reg: |
| items: |
| minimum: 0 |
| maximum: 5 |
| |
| examples: |
| - | |
| #include <dt-bindings/interrupt-controller/arm-gic.h> |
| #include <dt-bindings/clock/stm32mp1-clks.h> |
| dfsdm: dfsdm@4400d000 { |
| compatible = "st,stm32mp1-dfsdm"; |
| reg = <0x4400d000 0x800>; |
| clocks = <&rcc DFSDM_K>, <&rcc ADFSDM_K>; |
| clock-names = "dfsdm", "audio"; |
| #address-cells = <1>; |
| #size-cells = <0>; |
| |
| dfsdm0: filter@0 { |
| compatible = "st,stm32-dfsdm-dmic"; |
| reg = <0>; |
| interrupts = <GIC_SPI 110 IRQ_TYPE_LEVEL_HIGH>; |
| dmas = <&dmamux1 101 0x400 0x01>; |
| dma-names = "rx"; |
| #io-channel-cells = <1>; |
| st,adc-channels = <1>; |
| st,adc-channel-names = "dmic0"; |
| st,adc-channel-types = "SPI_R"; |
| st,adc-channel-clk-src = "CLKOUT"; |
| st,filter-order = <5>; |
| |
| asoc_pdm0: dfsdm-dai { |
| compatible = "st,stm32h7-dfsdm-dai"; |
| #sound-dai-cells = <0>; |
| io-channels = <&dfsdm0 0>; |
| }; |
| }; |
| |
| dfsdm_pdm1: filter@1 { |
| compatible = "st,stm32-dfsdm-adc"; |
| reg = <1>; |
| interrupts = <GIC_SPI 111 IRQ_TYPE_LEVEL_HIGH>; |
| dmas = <&dmamux1 102 0x400 0x01>; |
| dma-names = "rx"; |
| #io-channel-cells = <1>; |
| st,adc-channels = <2 3>; |
| st,adc-channel-names = "in2", "in3"; |
| st,adc-channel-types = "SPI_R", "SPI_R"; |
| st,adc-channel-clk-src = "CLKOUT_F", "CLKOUT_F"; |
| io-channels = <&sd_adc2 &sd_adc3>; |
| st,filter-order = <1>; |
| }; |
| }; |
| |
| ... |
