196 lines
4.9 KiB
YAML
196 lines
4.9 KiB
YAML
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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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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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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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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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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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};
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};
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...
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