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Subject[PATCH 2/6] ASoC: add DT bindings for Microchip PDMC
Date
This patch adds DT bindings for the new Microchip PDMC embedded in
sama7g5 SoCs.

Signed-off-by: Codrin Ciubotariu <codrin.ciubotariu@microchip.com>
---
.../devicetree/bindings/sound/mchp,pdmc.yaml | 99 +++++++++++++++++++
include/dt-bindings/sound/mchp,pdmc.h | 13 +++
2 files changed, 112 insertions(+)
create mode 100644 Documentation/devicetree/bindings/sound/mchp,pdmc.yaml
create mode 100644 include/dt-bindings/sound/mchp,pdmc.h

diff --git a/Documentation/devicetree/bindings/sound/mchp,pdmc.yaml b/Documentation/devicetree/bindings/sound/mchp,pdmc.yaml
new file mode 100644
index 000000000000..bdf5c52c29d9
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/mchp,pdmc.yaml
@@ -0,0 +1,99 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/mchp,pdmc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Microchip PDMC Device Tree Bindings
+
+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:
+ "#sound-dai-cells":
+ const: 0
+
+ compatible:
+ const: microchip,sama7g5-pdmc
+
+ reg:
+ maxItems: 1
+
+ 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
+ microhpone 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:
+ - "#sound-dai-cells"
+ - compatible
+ - reg
+ - 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/mchp,pdmc.h>
+
+ pdmc: pdmc@e1608000 {
+ #sound-dai-cells = <0>;
+ compatible = "microchip,sama7g5-pdmc";
+ reg = <0xe1608000 0x4000>;
+ 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>;
+ };
diff --git a/include/dt-bindings/sound/mchp,pdmc.h b/include/dt-bindings/sound/mchp,pdmc.h
new file mode 100644
index 000000000000..543c424a5a6f
--- /dev/null
+++ b/include/dt-bindings/sound/mchp,pdmc.h
@@ -0,0 +1,13 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __DT_BINDINGS_MCHP_PDMC_H__
+#define __DT_BINDINGS_MCHP_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_MCHP_PDMC_H__ */
--
2.32.0
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