linux-kernel - [PATCH 2/6] ASoC: add DT bindings for Microchip PDMC

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Message-ID: <20220304181756.1894561-3-codrin.ciubotariu@microchip.com>
Date:   Fri, 4 Mar 2022 20:17:52 +0200
From:   Codrin Ciubotariu <codrin.ciubotariu@...rochip.com>
To:     <alsa-devel@...a-project.org>, <linux-kernel@...r.kernel.org>,
        <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>
CC:     <lars@...afoo.de>, <broonie@...nel.org>, <perex@...ex.cz>,
        <tiwai@...e.com>, <robh+dt@...nel.org>,
        <nicolas.ferre@...rochip.com>,
        "Codrin Ciubotariu" <codrin.ciubotariu@...rochip.com>
Subject: [PATCH 2/6] ASoC: add DT bindings for Microchip PDMC

This patch adds DT bindings for the new Microchip PDMC embedded in
sama7g5 SoCs.

Signed-off-by: Codrin Ciubotariu <codrin.ciubotariu@...rochip.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@...rochip.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@...08000 {
+        #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