ASoC: dt-bindings: stm32: convert sai to json-schema
Convert the STM32 SAI bindings to DT schema format using json-schema. Signed-off-by: Olivier Moysan <olivier.moysan@st.com> Reviewed-by: Rob Herring <robh@kernel.org> Link: https://lore.kernel.org/r/20201009141051.27365-1-olivier.moysan@st.com Signed-off-by: Mark Brown <broonie@kernel.org>
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Olivier Moysan
Mark Brown
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STMicroelectronics STM32 Serial Audio Interface (SAI).
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The SAI interface (Serial Audio Interface) offers a wide set of audio protocols
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as I2S standards, LSB or MSB-justified, PCM/DSP, TDM, and AC'97.
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The SAI contains two independent audio sub-blocks. Each sub-block has
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its own clock generator and I/O lines controller.
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Required properties:
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- compatible: Should be "st,stm32f4-sai" or "st,stm32h7-sai"
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- reg: Base address and size of SAI common register set.
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- clocks: Must contain phandle and clock specifier pairs for each entry
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in clock-names.
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- clock-names: Must contain "pclk" "x8k" and "x11k"
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"pclk": Clock which feeds the peripheral bus interface.
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Mandatory for "st,stm32h7-sai" compatible.
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Not used for "st,stm32f4-sai" compatible.
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"x8k": SAI parent clock for sampling rates multiple of 8kHz.
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"x11k": SAI parent clock for sampling rates multiple of 11.025kHz.
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- interrupts: cpu DAI interrupt line shared by SAI sub-blocks
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Optional properties:
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- resets: Reference to a reset controller asserting the SAI
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SAI subnodes:
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Two subnodes corresponding to SAI sub-block instances A et B can be defined.
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Subnode can be omitted for unsused sub-block.
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SAI subnodes required properties:
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- compatible: Should be "st,stm32-sai-sub-a" or "st,stm32-sai-sub-b"
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for SAI sub-block A or B respectively.
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- reg: Base address and size of SAI sub-block register set.
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- clocks: Must contain one phandle and clock specifier pair
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for sai_ck which feeds the internal clock generator.
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If the SAI shares a master clock, with another SAI set as MCLK
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clock provider, SAI provider phandle must be specified here.
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- clock-names: Must contain "sai_ck".
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Must also contain "MCLK", if SAI shares a master clock,
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with a SAI set as MCLK clock provider.
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- dmas: see Documentation/devicetree/bindings/dma/st,stm32-dma.yaml
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- dma-names: identifier string for each DMA request line
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"tx": if sai sub-block is configured as playback DAI
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"rx": if sai sub-block is configured as capture DAI
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- pinctrl-names: should contain only value "default"
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- pinctrl-0: see Documentation/devicetree/bindings/pinctrl/st,stm32-pinctrl.yaml
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SAI subnodes Optional properties:
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- st,sync: specify synchronization mode.
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By default SAI sub-block is in asynchronous mode.
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This property sets SAI sub-block as slave of another SAI sub-block.
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Must contain the phandle and index of the sai sub-block providing
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the synchronization.
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- st,iec60958: support S/PDIF IEC6958 protocol for playback
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IEC60958 protocol is not available for capture.
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By default, custom protocol is assumed, meaning that protocol is
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configured according to protocol defined in related DAI link node,
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such as i2s, left justified, right justified, dsp and pdm protocols.
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Note: ac97 protocol is not supported by SAI driver
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- #clock-cells: should be 0. This property must be present if the SAI device
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is a master clock provider, according to clocks bindings, described in
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Documentation/devicetree/bindings/clock/clock-bindings.txt.
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The device node should contain one 'port' child node with one child 'endpoint'
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node, according to the bindings defined in Documentation/devicetree/bindings/
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graph.txt.
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Example:
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sound_card {
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compatible = "audio-graph-card";
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dais = <&sai1b_port>;
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};
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sai1: sai1@40015800 {
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compatible = "st,stm32h7-sai";
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#address-cells = <1>;
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#size-cells = <1>;
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ranges = <0 0x40015800 0x400>;
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reg = <0x40015800 0x4>;
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clocks = <&rcc SAI1_CK>, <&rcc PLL1_Q>, <&rcc PLL2_P>;
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clock-names = "pclk", "x8k", "x11k";
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interrupts = <87>;
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sai1a: audio-controller@40015804 {
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compatible = "st,stm32-sai-sub-a";
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reg = <0x4 0x1C>;
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clocks = <&rcc SAI1_CK>;
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clock-names = "sai_ck";
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dmas = <&dmamux1 1 87 0x400 0x0>;
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dma-names = "tx";
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pinctrl-names = "default";
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pinctrl-0 = <&pinctrl_sai1a>;
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sai1b_port: port {
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cpu_endpoint: endpoint {
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remote-endpoint = <&codec_endpoint>;
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format = "i2s";
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};
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};
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};
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};
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audio-codec {
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codec_port: port {
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codec_endpoint: endpoint {
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remote-endpoint = <&cpu_endpoint>;
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};
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};
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};
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@ -0,0 +1,200 @@
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# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/sound/st,stm32-sai.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: STMicroelectronics STM32 Serial Audio Interface (SAI)
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maintainers:
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- Olivier Moysan <olivier.moysan@st.com>
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description:
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The SAI interface (Serial Audio Interface) offers a wide set of audio
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protocols as I2S standards, LSB or MSB-justified, PCM/DSP, TDM, and AC'97.
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The SAI contains two independent audio sub-blocks. Each sub-block has
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its own clock generator and I/O lines controller.
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properties:
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compatible:
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enum:
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- st,stm32f4-sai
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- st,stm32h7-sai
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reg:
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items:
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- description: Base address and size of SAI common register set.
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- description: Base address and size of SAI identification register set.
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minItems: 1
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maxItems: 2
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ranges:
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maxItems: 1
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interrupts:
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maxItems: 1
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resets:
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maxItems: 1
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"#address-cells":
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const: 1
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"#size-cells":
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const: 1
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clocks:
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maxItems: 3
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clock-names:
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maxItems: 3
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required:
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- compatible
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- reg
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- ranges
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- "#address-cells"
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- "#size-cells"
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- clocks
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- clock-names
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patternProperties:
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"^audio-controller@[0-9a-f]+$":
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type: object
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description:
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Two subnodes corresponding to SAI sub-block instances A et B
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can be defined. Subnode can be omitted for unsused sub-block.
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properties:
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compatible:
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description: Compatible for SAI sub-block A or B.
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pattern: "st,stm32-sai-sub-[ab]"
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"#sound-dai-cells":
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const: 0
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reg:
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maxItems: 1
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clocks:
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items:
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- description: sai_ck clock feeding the internal clock generator.
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- description: MCLK clock from a SAI set as master clock provider.
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minItems: 1
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maxItems: 2
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clock-names:
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items:
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- const: sai_ck
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- const: MCLK
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minItems: 1
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maxItems: 2
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dmas:
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maxItems: 1
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dma-names:
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description: |
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rx: SAI sub-block is configured as a capture DAI.
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tx: SAI sub-block is configured as a playback DAI.
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enum: [ rx, tx ]
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st,sync:
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description:
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Configure the SAI sub-block as slave of another SAI sub-block.
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By default SAI sub-block is in asynchronous mode.
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Must contain the phandle and index of the SAI sub-block providing
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the synchronization.
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allOf:
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- $ref: /schemas/types.yaml#definitions/phandle-array
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- maxItems: 1
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st,iec60958:
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description:
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If set, support S/PDIF IEC6958 protocol for playback.
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IEC60958 protocol is not available for capture.
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By default, custom protocol is assumed, meaning that protocol is
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configured according to protocol defined in related DAI link node,
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such as i2s, left justified, right justified, dsp and pdm protocols.
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allOf:
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- $ref: /schemas/types.yaml#definitions/flag
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"#clock-cells":
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description: Configure the SAI device as master clock provider.
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const: 0
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required:
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- compatible
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- "#sound-dai-cells"
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- reg
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- clocks
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- clock-names
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- dmas
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- dma-names
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allOf:
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- if:
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properties:
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compatible:
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contains:
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const: st,stm32f4-sai
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- then:
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properties:
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clocks:
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items:
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- description: x8k, SAI parent clock for sampling rates multiple of 8kHz.
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- description: x11k, SAI parent clock for sampling rates multiple of 11.025kHz.
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clock-names:
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items:
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- const: x8k
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- const: x11k
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- else:
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properties:
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clocks:
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items:
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- description: pclk feeds the peripheral bus interface.
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- description: x8k, SAI parent clock for sampling rates multiple of 8kHz.
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- description: x11k, SAI parent clock for sampling rates multiple of 11.025kHz.
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clock-names:
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items:
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- const: pclk
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- const: x8k
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- const: x11k
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additionalProperties: false
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examples:
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- |
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#include <dt-bindings/interrupt-controller/arm-gic.h>
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#include <dt-bindings/clock/stm32mp1-clks.h>
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#include <dt-bindings/reset/stm32mp1-resets.h>
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sai2: sai@4400b000 {
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compatible = "st,stm32h7-sai";
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#address-cells = <1>;
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#size-cells = <1>;
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ranges = <0 0x4400b000 0x400>;
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reg = <0x4400b000 0x4>, <0x4400b3f0 0x10>;
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clocks = <&rcc SAI2>, <&rcc PLL3_Q>, <&rcc PLL3_R>;
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clock-names = "pclk", "x8k", "x11k";
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pinctrl-names = "default", "sleep";
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pinctrl-0 = <&sai2a_pins_a>, <&sai2b_pins_b>;
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pinctrl-1 = <&sai2a_sleep_pins_a>, <&sai2b_sleep_pins_b>;
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status = "okay";
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sai2a: audio-controller@4400b004 {
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#sound-dai-cells = <0>;
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compatible = "st,stm32-sai-sub-a";
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reg = <0x4 0x1c>;
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dmas = <&dmamux1 89 0x400 0x01>;
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dma-names = "tx";
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clocks = <&rcc SAI2_K>;
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clock-names = "sai_ck";
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status = "okay";
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};
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};
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...
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