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| -rw-r--r-- | Documentation/devicetree/bindings/iio/adc/st,stm32-dfsdm-adc.yaml | 332 |
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diff --git a/Documentation/devicetree/bindings/iio/adc/st,stm32-dfsdm-adc.yaml b/Documentation/devicetree/bindings/iio/adc/st,stm32-dfsdm-adc.yaml new file mode 100644 index 000000000000..c91407081aa5 --- /dev/null +++ b/Documentation/devicetree/bindings/iio/adc/st,stm32-dfsdm-adc.yaml @@ -0,0 +1,332 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/st,stm32-dfsdm-adc.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: STMicroelectronics STM32 DFSDM ADC device driver + +maintainers: + - Fabrice Gasnier <fabrice.gasnier@st.com> + - Olivier Moysan <olivier.moysan@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 + maxItems: 2 + + clock-names: + items: + - const: dfsdm + - const: audio + minItems: 1 + maxItems: 2 + + "#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" + +patternProperties: + "^filter@[0-9]+$": + type: object + 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. + allOf: + - $ref: /schemas/types.yaml#/definitions/uint32-array + - items: + minimum: 0 + maximum: 7 + + st,adc-channel-names: + description: List of single-ended channel names. + allOf: + - $ref: /schemas/types.yaml#/definitions/string-array + + 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. + allOf: + - $ref: /schemas/types.yaml#/definitions/uint32 + - items: + minimum: 0 + 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 ] + allOf: + - $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 ] + allOf: + - $ref: /schemas/types.yaml#/definitions/non-unique-string-array + + st,adc-alt-channel: + description: + Must be defined if two sigma delta modulators are + connected on same SPI input. + If not set, channel n is connected to SPI input n. + If set, channel n is connected to SPI input n + 1. + type: boolean + + st,filter0-sync: + description: + Set to 1 to synchronize with DFSDM filter instance 0. + Used for multi microphones synchronization. + type: boolean + + dmas: + maxItems: 1 + + dma-names: + items: + - const: rx + + required: + - compatible + - reg + - interrupts + - st,adc-channels + - st,adc-channel-names + - st,filter-order + - "#io-channel-cells" + + allOf: + - if: + properties: + compatible: + contains: + const: st,stm32-dfsdm-adc + + - then: + properties: + st,adc-channels: + minItems: 1 + maxItems: 8 + + st,adc-channel-names: + minItems: 1 + maxItems: 8 + + st,adc-channel-types: + minItems: 1 + maxItems: 8 + + st,adc-channel-clk-src: + minItems: 1 + maxItems: 8 + + io-channels: + description: + From common IIO binding. Used to pipe external sigma delta + modulator or internal ADC output to DFSDM channel. + This is not required for "st,stm32-dfsdm-pdm" compatibility as + PDM microphone is binded in Audio DT node. + + required: + - io-channels + + - if: + properties: + compatible: + contains: + const: st,stm32-dfsdm-dmic + + - then: + properties: + st,adc-channels: + maxItems: 1 + + st,adc-channel-names: + maxItems: 1 + + st,adc-channel-types: + maxItems: 1 + + st,adc-channel-clk-src: + maxItems: 1 + + required: + - dmas + - dma-names + + patternProperties: + "^dfsdm-dai+$": + type: object + description: child node + + properties: + "#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: + - "#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>; + }; + }; + +... |