linux-kernel - [RFC PATCH v2 1/5] dt-bindings: sound: Add Apple MCA I2S transceiver

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Message-Id: <20220606191910.16580-2-povik+lin@cutebit.org>
Date:   Mon,  6 Jun 2022 21:19:06 +0200
From:   Martin Povišer <povik+lin@...ebit.org>
To:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>
Cc:     Martin Povišer <povik+lin@...ebit.org>,
        alsa-devel@...a-project.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, Mark Kettenis <kettenis@...nbsd.org>,
        Hector Martin <marcan@...can.st>,
        Sven Peter <sven@...npeter.dev>, asahi@...ts.linux.dev
Subject: [RFC PATCH v2 1/5] dt-bindings: sound: Add Apple MCA I2S transceiver

Add binding schema for MCA I2S transceiver found on Apple M1 and other
chips.

Signed-off-by: Martin Povišer <povik+lin@...ebit.org>
---
 .../devicetree/bindings/sound/apple,mca.yaml  | 102 ++++++++++++++++++
 1 file changed, 102 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/sound/apple,mca.yaml

diff --git a/Documentation/devicetree/bindings/sound/apple,mca.yaml b/Documentation/devicetree/bindings/sound/apple,mca.yaml
new file mode 100644
index 000000000000..c8a36d8c38ad
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/apple,mca.yaml
@@ -0,0 +1,102 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/apple,mca.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Apple MCA I2S transceiver
+
+description: |
+  MCA is an I2S transceiver peripheral found on M1 and other Apple chips. It is
+  composed of a number of identical clusters which can operate independently
+  or in an interlinked fashion. Up to 6 clusters have been seen on an MCA.
+
+maintainers:
+  - Martin Povišer <povik+lin@...ebit.org>
+
+properties:
+  compatible:
+    items:
+      - enum:
+          - apple,t8103-mca
+          - apple,t6000-mca
+      - const: apple,mca
+
+  reg:
+    minItems: 2
+    maxItems: 2
+
+  interrupts:
+    maxItems: 6
+    description: |
+      One interrupt per each cluster
+
+  "#address-cells":
+    const: 1
+
+  "#size-cells":
+    const: 0
+
+  dmas:
+    minItems: 16
+    maxItems: 24
+    description: |
+      DMA channels associated to the SERDES units within the peripheral. They
+      are listed in groups of four per cluster, and within the cluster they are
+      given in order TXA, RXA, TXB, RXB of the respective SERDES units.
+
+  dma-names:
+    minItems: 16
+    maxItems: 24
+    description: |
+      Names for the DMA channels: 'tx'/'rx', then cluster number, then 'a'/'b'
+      based on the associated SERDES unit.
+
+  clocks:
+    minItems: 4
+    maxItems: 6
+    description: |
+      Clusters' input reference clock.
+
+  power-domains:
+    minItems: 5
+    maxItems: 7
+    description: |
+      First the overall power domain for register access, then the power
+      domains of individual clusters for their operation.
+
+  "#sound-dai-cells":
+    const: 1
+
+required:
+  - compatible
+  - reg
+  - dmas
+  - dma-names
+  - clocks
+  - power-domains
+  - '#sound-dai-cells'
+
+additionalProperties: false
+
+examples:
+  - |
+    mca: mca@...00000 {
+      compatible = "apple,t6000-mca", "apple,mca";
+      reg = <0x9b600000 0x10000>,
+            <0x9b500000 0x20000>;
+
+      clocks = <&nco 0>, <&nco 1>, <&nco 2>, <&nco 3>;
+      power-domains = <&ps_audio_p>, <&ps_mca0>, <&ps_mca1>,
+                      <&ps_mca2>, <&ps_mca3>;
+      dmas = <&admac 0>, <&admac 1>, <&admac 2>, <&admac 3>,
+             <&admac 4>, <&admac 5>, <&admac 6>, <&admac 7>,
+             <&admac 8>, <&admac 9>, <&admac 10>, <&admac 11>,
+             <&admac 12>, <&admac 13>, <&admac 14>, <&admac 15>;
+      dma-names = "tx0a", "rx0a", "tx0b", "rx0b",
+                  "tx1a", "rx1a", "tx1b", "rx1b",
+                  "tx2a", "rx2a", "tx2b", "rx2b",
+                  "tx3a", "rx3a", "tx3b", "rx3b";
+
+      #sound-dai-cells = <1>;
+    };
-- 
2.33.0