| Tom Rini | 53633a8 | 2024-02-29 12:33:36 -0500 | [diff] [blame] | 1 | # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) |
| 2 | %YAML 1.2 |
| 3 | --- |
| 4 | $id: http://devicetree.org/schemas/sound/microchip,sama7g5-pdmc.yaml# |
| 5 | $schema: http://devicetree.org/meta-schemas/core.yaml# |
| 6 | |
| 7 | title: Microchip Pulse Density Microphone Controller |
| 8 | |
| 9 | maintainers: |
| 10 | - Codrin Ciubotariu <codrin.ciubotariu@microchip.com> |
| 11 | |
| 12 | description: |
| 13 | The Microchip Pulse Density Microphone Controller (PDMC) interfaces up to 4 |
| 14 | digital microphones having Pulse Density Modulated (PDM) outputs. |
| 15 | |
| 16 | allOf: |
| 17 | - $ref: dai-common.yaml# |
| 18 | |
| 19 | properties: |
| 20 | compatible: |
| 21 | const: microchip,sama7g5-pdmc |
| 22 | |
| 23 | reg: |
| 24 | maxItems: 1 |
| 25 | |
| 26 | "#sound-dai-cells": |
| 27 | const: 0 |
| 28 | |
| 29 | interrupts: |
| 30 | maxItems: 1 |
| 31 | |
| 32 | clocks: |
| 33 | items: |
| 34 | - description: Peripheral Bus Clock |
| 35 | - description: Generic Clock |
| 36 | |
| 37 | clock-names: |
| 38 | items: |
| 39 | - const: pclk |
| 40 | - const: gclk |
| 41 | |
| 42 | dmas: |
| 43 | description: RX DMA Channel |
| 44 | maxItems: 1 |
| 45 | |
| 46 | dma-names: |
| 47 | const: rx |
| 48 | |
| 49 | microchip,mic-pos: |
| 50 | description: | |
| 51 | Position of PDM microphones on the DS line and the sampling edge (rising |
| 52 | or falling) of the CLK line. A microphone is represented as a pair of DS |
| 53 | line and the sampling edge. The first microphone is mapped to channel 0, |
| 54 | the second to channel 1, etc. |
| 55 | $ref: /schemas/types.yaml#/definitions/uint32-matrix |
| 56 | items: |
| 57 | items: |
| 58 | - description: value for DS line |
| 59 | enum: [0, 1] |
| 60 | - description: value for sampling edge |
| 61 | enum: [0, 1] |
| 62 | minItems: 1 |
| 63 | maxItems: 4 |
| 64 | uniqueItems: true |
| 65 | |
| 66 | microchip,startup-delay-us: |
| 67 | description: | |
| 68 | Specifies the delay in microseconds that needs to be applied after |
| 69 | enabling the PDMC microphones to avoid unwanted noise due to microphones |
| 70 | not being ready. |
| 71 | |
| 72 | required: |
| 73 | - compatible |
| 74 | - reg |
| 75 | - "#sound-dai-cells" |
| 76 | - interrupts |
| 77 | - clocks |
| 78 | - clock-names |
| 79 | - dmas |
| 80 | - dma-names |
| 81 | - microchip,mic-pos |
| 82 | |
| 83 | unevaluatedProperties: false |
| 84 | |
| 85 | examples: |
| 86 | - | |
| 87 | #include <dt-bindings/clock/at91.h> |
| 88 | #include <dt-bindings/dma/at91.h> |
| 89 | #include <dt-bindings/interrupt-controller/arm-gic.h> |
| 90 | #include <dt-bindings/sound/microchip,pdmc.h> |
| 91 | |
| 92 | pdmc: sound@e1608000 { |
| 93 | compatible = "microchip,sama7g5-pdmc"; |
| 94 | reg = <0xe1608000 0x4000>; |
| 95 | #sound-dai-cells = <0>; |
| 96 | interrupts = <GIC_SPI 68 IRQ_TYPE_LEVEL_HIGH>; |
| 97 | dmas = <&dma0 AT91_XDMAC_DT_PERID(37)>; |
| 98 | dma-names = "rx"; |
| 99 | clocks = <&pmc PMC_TYPE_PERIPHERAL 68>, <&pmc PMC_TYPE_GCK 68>; |
| 100 | clock-names = "pclk", "gclk"; |
| 101 | microchip,mic-pos = <MCHP_PDMC_DS0 MCHP_PDMC_CLK_POSITIVE>, |
| 102 | <MCHP_PDMC_DS0 MCHP_PDMC_CLK_NEGATIVE>, |
| 103 | <MCHP_PDMC_DS1 MCHP_PDMC_CLK_POSITIVE>, |
| 104 | <MCHP_PDMC_DS1 MCHP_PDMC_CLK_NEGATIVE>; |
| 105 | }; |