[PATCH] ASoC: dt-bindings: fsl-sai: Convert to YAML DT schema

[Marek Vasut <marex@denx.de>]

Convert the SAI bindings to YAML DT schema to permit validation.
Add Shengjiu as maintainer, derived from sound/soc/fsl/fsl_sai.c
get_maintainer result.

Describe existing used combinations of compatible strings, add the
missing imx7d-sai compatible string which is used on i.MX7 .

Properties lsb-first, fsl,sai-synchronous-rx, fsl,sai-asynchronous,
fsl,dataline are no longer listed as required, since those are clearly
optional, even the description says so, so does their usage.

Fix the undefined edma channel macro per arch/arm/boot/dts/vfxxx.dtsi ,
use the value itself just like in the vfxxx.dtsi .

Document interrupts property, which was previously undocumented, but
it is required property of this IP.

Document #sound-sai-cells, which should be zero for this IP.

Document fsl,imx6ul-iomuxc-gpr and its dependency on MX6UL and
fsl,sai-mclk-direction-output .

Signed-off-by: Marek Vasut <marex@denx.de>
---
Cc: Fabio Estevam <festevam@gmail.com>
Cc: Jaroslav Kysela <perex@perex.cz>
Cc: Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>
Cc: Liam Girdwood <lgirdwood@gmail.com>
Cc: Mark Brown <broonie@kernel.org>
Cc: Nicolin Chen <nicoleotsuka@gmail.com>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Shengjiu Wang <shengjiu.wang@gmail.com>
Cc: Takashi Iwai <tiwai@suse.com>
Cc: Xiubo Li <Xiubo.Lee@gmail.com>
Cc: alsa-devel@alsa-project.org
To: devicetree@vger.kernel.org
---
 .../devicetree/bindings/sound/fsl-sai.yaml    | 188 ++++++++++++++++++
 1 file changed, 188 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/sound/fsl-sai.yaml

diff --git a/Documentation/devicetree/bindings/sound/fsl-sai.yaml b/Documentation/devicetree/bindings/sound/fsl-sai.yaml
new file mode 100644
index 0000000000000..e6620a127f419
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/fsl-sai.yaml
@@ -0,0 +1,188 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/fsl-sai.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Freescale Synchronous Audio Interface (SAI).
+
+maintainers:
+  - Shengjiu Wang <shengjiu.wang@gmail.com>
+
+description:
+  The SAI is based on I2S module that used communicating with audio
+  codecs, which provides a synchronous audio interface that supports
+  fullduplex serial interfaces with frame synchronization such as I2S,
+  AC97, TDM, and codec/DSP interfaces.
+
+properties:
+  compatible:
+    oneOf:
+      - items:
+          - enum:
+              - fsl,imx6ul-sai
+              - fsl,imx7d-sai
+          - const: fsl,imx6sx-sai
+
+      - items:
+          - enum:
+              - fsl,imx8mm-sai
+              - fsl,imx8mn-sai
+              - fsl,imx8mp-sai
+          - const: fsl,imx8mq-sai
+
+      - items:
+          - enum:
+              - fsl,imx6sx-sai
+              - fsl,imx7ulp-sai
+              - fsl,imx8mq-sai
+              - fsl,imx8qm-sai
+              - fsl,imx8ulp-sai
+              - fsl,vf610-sai
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    minItems: 4
+    maxItems: 6
+
+  clock-names:
+    minItems: 4
+    items:
+      - const: bus
+      - const: mclk1
+      - const: mclk2
+      - const: mclk3
+      - const: pll8k
+      - const: pll11k
+
+  dmas:
+    maxItems: 2
+
+  dma-names:
+    items:
+      - const: tx
+      - const: rx
+
+  interrupts:
+    maxItems: 1
+
+  lsb-first:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description: |
+      Configures whether the LSB or the MSB is transmitted first for the
+      fifo data. If this property is absent, the MSB is transmitted first
+      as default, or the LSB is transmitted first.
+
+  fsl,sai-synchronous-rx:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description: |
+      This is a boolean property. If present, indicating that SAI will
+      work in the synchronous mode (sync Tx with Rx) which means both
+      the transmitter and the receiver will send and receive data by
+      following receiver's bit clocks and frame sync clocks.
+      If both fsl,sai-asynchronous and fsl,sai-synchronous-rx are
+      absent, the default synchronous mode (sync Rx with Tx) will
+      be used, which means both transmitter and receiver will send
+      and receive data by following clocks of transmitter.
+      fsl,sai-asynchronous and fsl,sai-synchronous-rx are exclusive.
+
+  fsl,sai-asynchronous:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description: |
+      If present, indicating that SAI will work in the asynchronous
+      mode, which means both transmitter and receiver will send and
+      receive data by following their own bit clocks and frame sync
+      clocks separately.
+      If both fsl,sai-asynchronous and fsl,sai-synchronous-rx are
+      absent, the default synchronous mode (sync Rx with Tx) will
+      be used, which means both transmitter and receiver will send
+      and receive data by following clocks of transmitter.
+      fsl,sai-asynchronous and fsl,sai-synchronous-rx are exclusive.
+
+  fsl,dataline:
+    $ref: /schemas/types.yaml#/definitions/uint8-array
+    description: |
+      Configure the dataline. It has 3 values for each configuration:
+      first one means the type: I2S(1) or PDM(2)
+      second one is dataline mask for 'rx'
+      third one is dataline mask for 'tx'.
+      for example: fsl,dataline = <1 0xff 0xff 2 0xff 0x11>;
+      means I2S type rx mask is 0xff, tx mask is 0xff, PDM type
+      rx mask is 0xff, tx mask is 0x11 (dataline 1 and 4 enabled).
+
+  fsl,sai-mclk-direction-output:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description: |
+      If present, indicates that SAI will output the SAI MCLK clock.
+
+  fsl,imx6ul-iomuxc-gpr:
+    $ref: /schemas/types.yaml#/definitions/phandle
+    description: Phandle to MX6UL IOMUXC GPR shared register file.
+
+  big-endian:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description: |
+     Required if all the SAI registers are big-endian rather
+     than little-endian.
+
+  "#sound-dai-cells":
+    const: 0
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - clock-names
+  - dmas
+  - dma-names
+  - interrupts
+
+unevaluatedProperties: false
+
+allOf:
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - fsl,imx6ul-sai
+    then:
+      dependencies:
+        fsl,imx6ul-iomuxc-gpr: [ "fsl,sai-mclk-direction-output" ]
+
+  - if:
+      not:
+        properties:
+          compatible:
+            contains:
+              enum:
+                - fsl,imx6ul-sai
+                - fsl,imx8mm-sai
+                - fsl,imx8mn-sai
+                - fsl,imx8mp-sai
+                - fsl,imx8mq-sai
+    then:
+      properties:
+        fsl,sai-mclk-direction-output: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/vf610-clock.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+    sai@40031000 {
+      compatible = "fsl,vf610-sai";
+      reg = <0x40031000 0x1000>;
+      interrupts = <86 IRQ_TYPE_LEVEL_HIGH>;
+      pinctrl-names = "default";
+      pinctrl-0 = <&pinctrl_sai2_1>;
+      clocks = <&clks VF610_CLK_PLATFORM_BUS>, <&clks VF610_CLK_SAI2>,
+               <&clks 0>, <&clks 0>;
+      clock-names = "bus", "mclk1", "mclk2", "mclk3";
+      dma-names = "tx", "rx";
+      dmas = <&edma0 0 21>, <&edma0 0 20>;
+      big-endian;
+      lsb-first;
+    };
-- 
2.35.1