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# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/sound/microchip,sama7g5-pdmc.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: Microchip Pulse Density Microphone Controller
maintainers:
- Codrin Ciubotariu <codrin.ciubotariu@microchip.com>
description:
The Microchip Pulse Density Microphone Controller (PDMC) interfaces up to 4
digital microphones having Pulse Density Modulated (PDM) outputs.
allOf:
- $ref: dai-common.yaml#
properties:
compatible:
const: microchip,sama7g5-pdmc
reg:
maxItems: 1
"#sound-dai-cells":
const: 0
interrupts:
maxItems: 1
clocks:
items:
- description: Peripheral Bus Clock
- description: Generic Clock
clock-names:
items:
- const: pclk
- const: gclk
dmas:
description: RX DMA Channel
maxItems: 1
dma-names:
const: rx
microchip,mic-pos:
description: |
Position of PDM microphones on the DS line and the sampling edge (rising
or falling) of the CLK line. A microphone is represented as a pair of DS
line and the sampling edge. The first microphone is mapped to channel 0,
the second to channel 1, etc.
$ref: /schemas/types.yaml#/definitions/uint32-matrix
items:
items:
- description: value for DS line
enum: [0, 1]
- description: value for sampling edge
enum: [0, 1]
minItems: 1
maxItems: 4
uniqueItems: true
microchip,startup-delay-us:
description: |
Specifies the delay in microseconds that needs to be applied after
enabling the PDMC microphones to avoid unwanted noise due to microphones
not being ready.
required:
- compatible
- reg
- "#sound-dai-cells"
- interrupts
- clocks
- clock-names
- dmas
- dma-names
- microchip,mic-pos
unevaluatedProperties: false
examples:
- |
#include <dt-bindings/clock/at91.h>
#include <dt-bindings/dma/at91.h>
#include <dt-bindings/interrupt-controller/arm-gic.h>
#include <dt-bindings/sound/microchip,pdmc.h>
pdmc: sound@e1608000 {
compatible = "microchip,sama7g5-pdmc";
reg = <0xe1608000 0x4000>;
#sound-dai-cells = <0>;
interrupts = <GIC_SPI 68 IRQ_TYPE_LEVEL_HIGH>;
dmas = <&dma0 AT91_XDMAC_DT_PERID(37)>;
dma-names = "rx";
clocks = <&pmc PMC_TYPE_PERIPHERAL 68>, <&pmc PMC_TYPE_GCK 68>;
clock-names = "pclk", "gclk";
microchip,mic-pos = <MCHP_PDMC_DS0 MCHP_PDMC_CLK_POSITIVE>,
<MCHP_PDMC_DS0 MCHP_PDMC_CLK_NEGATIVE>,
<MCHP_PDMC_DS1 MCHP_PDMC_CLK_POSITIVE>,
<MCHP_PDMC_DS1 MCHP_PDMC_CLK_NEGATIVE>;
};
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