330 lines
8.5 KiB
YAML
330 lines
8.5 KiB
YAML
# 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>;
|
|
};
|
|
};
|
|
|
|
...
|