[PATCH v4] ASoC: dt-bindings: stm32: convert sai to json-schema

* [PATCH v4] ASoC: dt-bindings: stm32: convert sai to json-schema
@ 2020-10-09 14:10 Olivier Moysan
  2020-10-13 16:06 ` Rob Herring
  2020-10-26 23:45 ` Mark Brown
  0 siblings, 2 replies; 3+ messages in thread
From: Olivier Moysan @ 2020-10-09 14:10 UTC (permalink / raw)
  To: lgirdwood, broonie, perex, tiwai, alexandre.torgue, robh, mark.rutland
  Cc: alsa-devel, devicetree, linux-arm-kernel, linux-stm32,
	linux-kernel, olivier.moysan, arnaud.pouliquen

Convert the STM32 SAI bindings to DT schema format using json-schema.

Signed-off-by: Olivier Moysan <olivier.moysan@st.com>
---
Changes in v2:
- use pattern for compatible of child nodes
- rework dmas and clocks properties
- add "additionalProperties"

Changes in v3:
- move clocks properties for st,stm32h7-sai compatible, to 'else' clause

Changes in v4:
- fix dtbs_check errors
---
 .../bindings/sound/st,stm32-sai.txt           | 107 ----------
 .../bindings/sound/st,stm32-sai.yaml          | 200 ++++++++++++++++++
 2 files changed, 200 insertions(+), 107 deletions(-)
 delete mode 100644 Documentation/devicetree/bindings/sound/st,stm32-sai.txt
 create mode 100644 Documentation/devicetree/bindings/sound/st,stm32-sai.yaml

diff --git a/Documentation/devicetree/bindings/sound/st,stm32-sai.txt b/Documentation/devicetree/bindings/sound/st,stm32-sai.txt
deleted file mode 100644
index c42b91e525fa..000000000000
--- a/Documentation/devicetree/bindings/sound/st,stm32-sai.txt
+++ /dev/null
@@ -1,107 +0,0 @@
-STMicroelectronics STM32 Serial Audio Interface (SAI).
-
-The SAI interface (Serial Audio Interface) offers a wide set of audio protocols
-as I2S standards, LSB or MSB-justified, PCM/DSP, TDM, and AC'97.
-The SAI contains two independent audio sub-blocks. Each sub-block has
-its own clock generator and I/O lines controller.
-
-Required properties:
-  - compatible: Should be "st,stm32f4-sai" or "st,stm32h7-sai"
-  - reg: Base address and size of SAI common register set.
-  - clocks: Must contain phandle and clock specifier pairs for each entry
-	in clock-names.
-  - clock-names: Must contain "pclk" "x8k" and "x11k"
-	"pclk": Clock which feeds the peripheral bus interface.
-	        Mandatory for "st,stm32h7-sai" compatible.
-	        Not used for "st,stm32f4-sai" compatible.
-	"x8k": SAI parent clock for sampling rates multiple of 8kHz.
-	"x11k": SAI parent clock for sampling rates multiple of 11.025kHz.
-  - interrupts: cpu DAI interrupt line shared by SAI sub-blocks
-
-Optional properties:
-  - resets: Reference to a reset controller asserting the SAI
-
-SAI subnodes:
-Two subnodes corresponding to SAI sub-block instances A et B can be defined.
-Subnode can be omitted for unsused sub-block.
-
-SAI subnodes required properties:
-  - compatible: Should be "st,stm32-sai-sub-a" or "st,stm32-sai-sub-b"
-	for SAI sub-block A or B respectively.
-  - reg: Base address and size of SAI sub-block register set.
-  - clocks: Must contain one phandle and clock specifier pair
-	for sai_ck which feeds the internal clock generator.
-	If the SAI shares a master clock, with another SAI set as MCLK
-	clock provider, SAI provider phandle must be specified here.
-  - clock-names: Must contain "sai_ck".
-	Must also contain "MCLK", if SAI shares a master clock,
-	with a SAI set as MCLK clock provider.
-  - dmas: see Documentation/devicetree/bindings/dma/st,stm32-dma.yaml
-  - dma-names: identifier string for each DMA request line
-	"tx": if sai sub-block is configured as playback DAI
-	"rx": if sai sub-block is configured as capture DAI
-  - pinctrl-names: should contain only value "default"
-  - pinctrl-0: see Documentation/devicetree/bindings/pinctrl/st,stm32-pinctrl.yaml
-
-SAI subnodes Optional properties:
-  - st,sync: specify synchronization mode.
-	By default SAI sub-block is in asynchronous mode.
-	This property sets SAI sub-block as slave of another SAI sub-block.
-	Must contain the phandle and index of the sai sub-block providing
-	the synchronization.
-  - st,iec60958: support S/PDIF IEC6958 protocol for playback
-	IEC60958 protocol is not available for capture.
-	By default, custom protocol is assumed, meaning that protocol is
-	configured according to protocol defined in related DAI link node,
-	such as i2s, left justified, right justified, dsp and pdm protocols.
-	Note: ac97 protocol is not supported by SAI driver
-   - #clock-cells: should be 0. This property must be present if the SAI device
-	is a master clock provider, according to clocks bindings, described in
-	Documentation/devicetree/bindings/clock/clock-bindings.txt.
-
-The device node should contain one 'port' child node with one child 'endpoint'
-node, according to the bindings defined in Documentation/devicetree/bindings/
-graph.txt.
-
-Example:
-sound_card {
-	compatible = "audio-graph-card";
-	dais = <&sai1b_port>;
-};
-
-sai1: sai1@40015800 {
-	compatible = "st,stm32h7-sai";
-	#address-cells = <1>;
-	#size-cells = <1>;
-	ranges = <0 0x40015800 0x400>;
-	reg = <0x40015800 0x4>;
-	clocks = <&rcc SAI1_CK>, <&rcc PLL1_Q>, <&rcc PLL2_P>;
-	clock-names = "pclk", "x8k", "x11k";
-	interrupts = <87>;
-
-	sai1a: audio-controller@40015804 {
-		compatible = "st,stm32-sai-sub-a";
-		reg = <0x4 0x1C>;
-		clocks = <&rcc SAI1_CK>;
-		clock-names = "sai_ck";
-		dmas = <&dmamux1 1 87 0x400 0x0>;
-		dma-names = "tx";
-		pinctrl-names = "default";
-		pinctrl-0 = <&pinctrl_sai1a>;
-
-		sai1b_port: port {
-			cpu_endpoint: endpoint {
-				remote-endpoint = <&codec_endpoint>;
-				format = "i2s";
-			};
-		};
-	};
-};
-
-audio-codec {
-	codec_port: port {
-		codec_endpoint: endpoint {
-			remote-endpoint = <&cpu_endpoint>;
-		};
-	};
-};
diff --git a/Documentation/devicetree/bindings/sound/st,stm32-sai.yaml b/Documentation/devicetree/bindings/sound/st,stm32-sai.yaml
new file mode 100644
index 000000000000..6ad48c7681c1
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/st,stm32-sai.yaml
@@ -0,0 +1,200 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/st,stm32-sai.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: STMicroelectronics STM32 Serial Audio Interface (SAI)
+
+maintainers:
+  - Olivier Moysan <olivier.moysan@st.com>
+
+description:
+  The SAI interface (Serial Audio Interface) offers a wide set of audio
+  protocols as I2S standards, LSB or MSB-justified, PCM/DSP, TDM, and AC'97.
+  The SAI contains two independent audio sub-blocks. Each sub-block has
+  its own clock generator and I/O lines controller.
+
+properties:
+  compatible:
+    enum:
+      - st,stm32f4-sai
+      - st,stm32h7-sai
+
+  reg:
+    items:
+      - description: Base address and size of SAI common register set.
+      - description: Base address and size of SAI identification register set.
+    minItems: 1
+    maxItems: 2
+
+  ranges:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  resets:
+    maxItems: 1
+
+  "#address-cells":
+    const: 1
+
+  "#size-cells":
+    const: 1
+
+  clocks:
+    maxItems: 3
+
+  clock-names:
+    maxItems: 3
+
+required:
+  - compatible
+  - reg
+  - ranges
+  - "#address-cells"
+  - "#size-cells"
+  - clocks
+  - clock-names
+
+patternProperties:
+  "^audio-controller@[0-9a-f]+$":
+    type: object
+    description:
+      Two subnodes corresponding to SAI sub-block instances A et B
+      can be defined. Subnode can be omitted for unsused sub-block.
+
+    properties:
+      compatible:
+        description: Compatible for SAI sub-block A or B.
+        pattern: "st,stm32-sai-sub-[ab]"
+
+      "#sound-dai-cells":
+        const: 0
+
+      reg:
+        maxItems: 1
+
+      clocks:
+        items:
+          - description: sai_ck clock feeding the internal clock generator.
+          - description: MCLK clock from a SAI set as master clock provider.
+        minItems: 1
+        maxItems: 2
+
+      clock-names:
+        items:
+          - const: sai_ck
+          - const: MCLK
+        minItems: 1
+        maxItems: 2
+
+      dmas:
+        maxItems: 1
+
+      dma-names:
+        description: |
+          rx: SAI sub-block is configured as a capture DAI.
+          tx: SAI sub-block is configured as a playback DAI.
+        enum: [ rx, tx ]
+
+      st,sync:
+        description:
+          Configure the SAI sub-block as slave of another SAI sub-block.
+          By default SAI sub-block is in asynchronous mode.
+          Must contain the phandle and index of the SAI sub-block providing
+          the synchronization.
+        allOf:
+          - $ref: /schemas/types.yaml#definitions/phandle-array
+          - maxItems: 1
+
+      st,iec60958:
+        description:
+          If set, support S/PDIF IEC6958 protocol for playback.
+          IEC60958 protocol is not available for capture.
+          By default, custom protocol is assumed, meaning that protocol is
+          configured according to protocol defined in related DAI link node,
+          such as i2s, left justified, right justified, dsp and pdm protocols.
+        allOf:
+          - $ref: /schemas/types.yaml#definitions/flag
+
+      "#clock-cells":
+        description: Configure the SAI device as master clock provider.
+        const: 0
+
+    required:
+      - compatible
+      - "#sound-dai-cells"
+      - reg
+      - clocks
+      - clock-names
+      - dmas
+      - dma-names
+
+allOf:
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: st,stm32f4-sai
+
+  - then:
+      properties:
+        clocks:
+          items:
+            - description: x8k, SAI parent clock for sampling rates multiple of 8kHz.
+            - description: x11k, SAI parent clock for sampling rates multiple of 11.025kHz.
+
+        clock-names:
+          items:
+            - const: x8k
+            - const: x11k
+
+  - else:
+      properties:
+        clocks:
+          items:
+            - description: pclk feeds the peripheral bus interface.
+            - description: x8k, SAI parent clock for sampling rates multiple of 8kHz.
+            - description: x11k, SAI parent clock for sampling rates multiple of 11.025kHz.
+
+        clock-names:
+          items:
+            - const: pclk
+            - const: x8k
+            - const: x11k
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/clock/stm32mp1-clks.h>
+    #include <dt-bindings/reset/stm32mp1-resets.h>
+    sai2: sai@4400b000 {
+      compatible = "st,stm32h7-sai";
+      #address-cells = <1>;
+      #size-cells = <1>;
+      ranges = <0 0x4400b000 0x400>;
+      reg = <0x4400b000 0x4>, <0x4400b3f0 0x10>;
+      clocks = <&rcc SAI2>, <&rcc PLL3_Q>, <&rcc PLL3_R>;
+      clock-names = "pclk", "x8k", "x11k";
+      pinctrl-names = "default", "sleep";
+      pinctrl-0 = <&sai2a_pins_a>, <&sai2b_pins_b>;
+      pinctrl-1 = <&sai2a_sleep_pins_a>, <&sai2b_sleep_pins_b>;
+      status = "okay";
+
+      sai2a: audio-controller@4400b004 {
+        #sound-dai-cells = <0>;
+        compatible = "st,stm32-sai-sub-a";
+        reg = <0x4 0x1c>;
+        dmas = <&dmamux1 89 0x400 0x01>;
+        dma-names = "tx";
+        clocks = <&rcc SAI2_K>;
+        clock-names = "sai_ck";
+        status = "okay";
+      };
+    };
+
+...
-- 
2.17.1


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