linux-kernel - [PATCH v3 2/6] ASoC: dt-bindings: Document Microchip's PDMC

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Date:   Mon, 7 Mar 2022 14:21:58 +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 v3 2/6] ASoC: dt-bindings: Document Microchip's PDMC

Add DT bindings for the new Microchip PDMC embedded in sama7g5 SoCs.

Signed-off-by: Codrin Ciubotariu <codrin.ciubotariu@...rochip.com>
---

Changes in v3:
 - set line length to 80 characters long
 - set 'reg' as the second property

Changes in v2:
 - renamed patch from 'ASoC: add DT bindings for Microchip PDMC' to
   'ASoC: dt-bindings: Document Microchip's PDMC';
 - renamed yaml file from 'mchp,pdmc.yaml' to 'microchip,pdmc.yaml';
 - used imperative mode in commit description;
 - renamed mchp,pdmc.h to microchip,pdmc.h;
 - fixed 'title' to represent HW;
 - made 'compatible' first property;
 - s/microhpone/microphone
 - none name in example set to 'sound'

 .../bindings/sound/microchip,pdmc.yaml        | 100 ++++++++++++++++++
 include/dt-bindings/sound/microchip,pdmc.h    |  13 +++
 2 files changed, 113 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/sound/microchip,pdmc.yaml
 create mode 100644 include/dt-bindings/sound/microchip,pdmc.h

diff --git a/Documentation/devicetree/bindings/sound/microchip,pdmc.yaml b/Documentation/devicetree/bindings/sound/microchip,pdmc.yaml
new file mode 100644
index 000000000000..04414eb4ada9
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/microchip,pdmc.yaml
@@ -0,0 +1,100 @@
+# 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@...rochip.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@...08000 {
+        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>;
+    };
diff --git a/include/dt-bindings/sound/microchip,pdmc.h b/include/dt-bindings/sound/microchip,pdmc.h
new file mode 100644
index 000000000000..96cde94ce74f
--- /dev/null
+++ b/include/dt-bindings/sound/microchip,pdmc.h
@@ -0,0 +1,13 @@
+/* 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__ */
-- 
2.32.0