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PDMC can work with different types of microphones, thus different boards could have different microphones. Depending on microphone type the PDMC would need to wait longer or shorter period (at startup) than the default chosen one to filter unwanted noise. Thus add microchip,startup-delay-us binding to let PDMC users to specify startup delay. Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> Link: https://lore.kernel.org/r/20230228110145.3770525-3-claudiu.beznea@microchip.com Signed-off-by: Mark Brown <broonie@kernel.org>
110 lines
2.8 KiB
YAML
110 lines
2.8 KiB
YAML
# 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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- description: value for sampling edge
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anyOf:
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- enum:
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- [0, 0]
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- [0, 1]
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- [1, 0]
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- [1, 1]
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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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