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 };
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.