linux-kernel - [PATCH v2 1/2] dt-bindings: sound: Add FSL CPU DAI bindings

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Date:   Fri,  6 Mar 2020 13:13:52 +0200
From:   Daniel Baluta <daniel.baluta@....nxp.com>
To:     pierre-louis.bossart@...ux.intel.com, alsa-devel@...a-project.org,
        kuninori.morimoto.gx@...esas.com, peter.ujfalusi@...com,
        broonie@...nel.org, linux-imx@....com, robh+dt@...nel.org,
        devicetree@...r.kernel.org
Cc:     Xiubo.Lee@...il.com, shengjiu.wang@....com,
        linux-kernel@...r.kernel.org, tiwai@...e.com,
        ranjani.sridharan@...ux.intel.com, liam.r.girdwood@...ux.intel.com,
        sound-open-firmware@...a-project.org,
        Daniel Baluta <daniel.baluta@....com>
Subject: [PATCH v2 1/2] dt-bindings: sound: Add FSL CPU DAI bindings

From: Daniel Baluta <daniel.baluta@....com>

Add dt bindings for he Generic FSL CPU DAI.

Signed-off-by: Daniel Baluta <daniel.baluta@....com>
---
 .../devicetree/bindings/sound/fsl,dai.yaml    | 97 +++++++++++++++++++
 1 file changed, 97 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/sound/fsl,dai.yaml

diff --git a/Documentation/devicetree/bindings/sound/fsl,dai.yaml b/Documentation/devicetree/bindings/sound/fsl,dai.yaml
new file mode 100644
index 000000000000..e6426af67d30
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/fsl,dai.yaml
@@ -0,0 +1,97 @@
+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/fsl,dai.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Generic CPU FSL DAI driver for resource management
+
+maintainers:
+  - Daniel Baluta <daniel.baluta@....com>
+
+description: |
+  On platforms with a DSP we need to split the resource handling between
+  Application Processor (AP) and DSP. On platforms where the DSP doesn't
+  have an easy access to resources, the AP will take care of
+  configuring them. Resources handled by this generic driver are: clocks,
+  power domains, pinctrl.
+
+properties:
+  '#sound-dai-cells':
+    const: 0
+
+  compatible:
+    enum:
+      - fsl,esai-dai
+      - fsl,sai-dai
+
+  clocks:
+    oneOf:
+      - items: # for ESAI
+          - description: Core clock used to access registers.
+          - description: ESAI baud clock for ESAI controller used to derive
+                         HCK, SCK and FS.
+          - description: The system clock derived from ahb clock used to derive
+                         HCK, SCK and FS.
+          - description: SPBA clock is required when ESAI is placed as a bus
+                         slave of the SP Bus and when two or more bus masters
+                         (CPU, DMA or DSP) try to access it. This property is
+                         optional depending on SoC design.
+      - items: # for SAI
+          - description: Bus clock for accessing registers
+          - description: Master clock 0 for providing bit clock and frame clock
+          - description: Master clock 1 for providing bit clock and frame clock
+          - description: Master clock 2 for providing bit clock and frame clock
+          - description: Master clock 3 for providing bit clock and frame clock
+
+  clock-names:
+    oneOf:
+      - items: # for ESAI
+          - const: core
+          - const: extal
+          - const: fsys
+          - const: spba
+      - items: # for SAI
+          - const: bus
+          - const: mclk0
+          - const: mclk1
+          - const: mclk2
+          - const: mclk3
+
+  pinctrl-0:
+    description: Should specify pin control groups used for this controller.
+
+  pinctrl-names:
+    const: default
+
+  power-domains:
+    $ref: '/schemas/types.yaml#/definitions/phandle-array'
+    description:
+      List of phandles and PM domain specifiers, as defined by bindings of the
+      PM domain provider.
+
+  fsl,dai-index:
+    $ref: '/schemas/types.yaml#/definitions/uint32'
+    description: Physical DAI index, must match the index from topology file
+
+required:
+  - compatible
+  - clocks
+  - clock-names
+  - fsl,dai-index
+
+examples:
+  - |
+    #include <dt-bindings/clock/imx8-clock.h>
+    esai0_port: esai-port {
+         #sound-dai-cells = <0>;
+        compatible = "fsl,esai-dai";
+
+        fsl,dai-index = <0>;
+        pinctrl-names = "default";
+        pinctrl-0 = <&pinctrl_esai0>;
+
+        clocks = <&esai0_lpcg 1>, <&esai0_lpcg 0>,  <&esai0_lpcg 1>,
+            <&clk_dummy>;
+        clock-names = "core", "extal", "fsys", "spba";
+    };
-- 
2.17.1