2023-08-30 17:31:07 +02:00
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# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/sound/microchip,sama7g5-pdmc.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: Microchip Pulse Density Microphone Controller
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maintainers:
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- Codrin Ciubotariu <codrin.ciubotariu@microchip.com>
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description:
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The Microchip Pulse Density Microphone Controller (PDMC) interfaces up to 4
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digital microphones having Pulse Density Modulated (PDM) outputs.
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allOf:
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- $ref: dai-common.yaml#
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properties:
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compatible:
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const: microchip,sama7g5-pdmc
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reg:
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maxItems: 1
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"#sound-dai-cells":
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const: 0
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interrupts:
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maxItems: 1
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clocks:
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items:
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- description: Peripheral Bus Clock
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- description: Generic Clock
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clock-names:
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items:
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- const: pclk
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- const: gclk
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dmas:
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description: RX DMA Channel
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maxItems: 1
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dma-names:
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const: rx
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microchip,mic-pos:
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description: |
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Position of PDM microphones on the DS line and the sampling edge (rising
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or falling) of the CLK line. A microphone is represented as a pair of DS
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line and the sampling edge. The first microphone is mapped to channel 0,
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the second to channel 1, etc.
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$ref: /schemas/types.yaml#/definitions/uint32-matrix
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items:
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items:
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- description: value for DS line
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2023-10-24 12:59:35 +02:00
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enum: [0, 1]
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2023-08-30 17:31:07 +02:00
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- description: value for sampling edge
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2023-10-24 12:59:35 +02:00
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enum: [0, 1]
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2023-08-30 17:31:07 +02:00
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minItems: 1
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maxItems: 4
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uniqueItems: true
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microchip,startup-delay-us:
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description: |
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Specifies the delay in microseconds that needs to be applied after
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enabling the PDMC microphones to avoid unwanted noise due to microphones
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not being ready.
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required:
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- compatible
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- reg
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- "#sound-dai-cells"
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- interrupts
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- clocks
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- clock-names
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- dmas
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- dma-names
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- microchip,mic-pos
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unevaluatedProperties: false
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examples:
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- |
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#include <dt-bindings/clock/at91.h>
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#include <dt-bindings/dma/at91.h>
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#include <dt-bindings/interrupt-controller/arm-gic.h>
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#include <dt-bindings/sound/microchip,pdmc.h>
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pdmc: sound@e1608000 {
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compatible = "microchip,sama7g5-pdmc";
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reg = <0xe1608000 0x4000>;
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#sound-dai-cells = <0>;
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interrupts = <GIC_SPI 68 IRQ_TYPE_LEVEL_HIGH>;
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dmas = <&dma0 AT91_XDMAC_DT_PERID(37)>;
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dma-names = "rx";
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clocks = <&pmc PMC_TYPE_PERIPHERAL 68>, <&pmc PMC_TYPE_GCK 68>;
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clock-names = "pclk", "gclk";
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microchip,mic-pos = <MCHP_PDMC_DS0 MCHP_PDMC_CLK_POSITIVE>,
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<MCHP_PDMC_DS0 MCHP_PDMC_CLK_NEGATIVE>,
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<MCHP_PDMC_DS1 MCHP_PDMC_CLK_POSITIVE>,
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<MCHP_PDMC_DS1 MCHP_PDMC_CLK_NEGATIVE>;
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};
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