Add driver for SAMA7G5's PDMC

# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)

%YAML 1.2

---

$id: http://devicetree.org/schemas/sound/microchip,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.

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

        - description: value for sampling edge

      anyOf:

        - enum:

            - [0, 0]

            - [0, 1]

            - [1, 0]

            - [1, 1]

    minItems: 1

    maxItems: 4

    uniqueItems: true

required:

  - compatible

  - reg

  - "#sound-dai-cells"

  - interrupts

  - clocks

  - clock-names

  - dmas

  - dma-names

  - microchip,mic-pos

additionalProperties: 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>;

    };

/* SPDX-License-Identifier: GPL-2.0 */

#ifndef __DT_BINDINGS_MICROCHIP_PDMC_H__

#define __DT_BINDINGS_MICROCHIP_PDMC_H__

/* PDM microphone's pin placement */

#define MCHP_PDMC_DS0 0

#define MCHP_PDMC_DS1 1

/* PDM microphone clock edge sampling */

#define MCHP_PDMC_CLK_POSITIVE 0

#define MCHP_PDMC_CLK_NEGATIVE 1

#endif /* __DT_BINDINGS_MICROCHIP_PDMC_H__ */

	  This S/PDIF RX driver is compliant with IEC-60958 standard and

	  includes programmable User Data and Channel Status fields.

config SND_MCHP_SOC_PDMC

	tristate "Microchip ASoC driver for boards using PDMC"

	depends on OF && (ARCH_AT91 || COMPILE_TEST)

	select SND_SOC_GENERIC_DMAENGINE_PCM

	select REGMAP_MMIO

	help

	  Say Y or M if you want to add support for Microchip ASoC PDMC driver on the

	  following Microchip platforms:

	  - sama7g5

	  The Pulse Density Microphone Controller (PDMC) interfaces up to 4 digital

	  microphones PDM outputs. It generates a single clock line and samples 1 or

	  2 data lines. The signal path includes an audio grade programmable

	  decimation filter and outputs 24-bit audio words.

endif

snd-soc-mchp-i2s-mcc-objs := mchp-i2s-mcc.o

snd-soc-mchp-spdiftx-objs := mchp-spdiftx.o

snd-soc-mchp-spdifrx-objs := mchp-spdifrx.o

snd-soc-mchp-pdmc-objs := mchp-pdmc.o

# pdc and dma need to both be built-in if any user of

# ssc is built-in.

obj-$(CONFIG_SND_MCHP_SOC_I2S_MCC) += snd-soc-mchp-i2s-mcc.o

obj-$(CONFIG_SND_MCHP_SOC_SPDIFTX) += snd-soc-mchp-spdiftx.o

obj-$(CONFIG_SND_MCHP_SOC_SPDIFRX) += snd-soc-mchp-spdifrx.o

obj-$(CONFIG_SND_MCHP_SOC_PDMC) += snd-soc-mchp-pdmc.o

# AT91 Machine Support

snd-soc-sam9g20-wm8731-objs := sam9g20_wm8731.o