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Date: Thu, 6 Feb 2020 18:21:25 +0000
From: Rob Herring <robh@...nel.org>
To: Olivier Moysan <olivier.moysan@...com>
Cc: lgirdwood@...il.com, broonie@...nel.org, perex@...ex.cz,
tiwai@...e.com, mcoquelin.stm32@...il.com, alexandre.torgue@...com,
alsa-devel@...a-project.org, mark.rutland@....com,
devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-stm32@...md-mailman.stormreply.com,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ASoC: dt-bindings: stm32: convert sai to json-schema
On Thu, Jan 30, 2020 at 02:50:40PM +0100, Olivier Moysan wrote:
> Convert the STM32 SAI bindings to DT schema format using json-schema.
>
> Signed-off-by: Olivier Moysan <olivier.moysan@...com>
> ---
> .../bindings/sound/st,stm32-sai.txt | 107 ----------
> .../bindings/sound/st,stm32-sai.yaml | 193 ++++++++++++++++++
> 2 files changed, 193 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.yaml b/Documentation/devicetree/bindings/sound/st,stm32-sai.yaml
> new file mode 100644
> index 000000000000..33dca007fc86
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/sound/st,stm32-sai.yaml
> @@ -0,0 +1,193 @@
> +# 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@...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:
> + 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:
> + enum: [ pclk, x8k, x11k ]
> + minItems: 3
> + 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.
> + enum:
> + - st,stm32-sai-sub-a
> + - st,stm32-sai-sub-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:
> + items:
> + - description: SAI sub-block is configured as a capture DAI.
> + - description: SAI sub-block is configured as a playback DAI.
> + minItems: 1
> + maxItems: 1
This is defining that dmas has 2 entries, but then limits it to the 1st
entry only.
> +
> + dma-names:
> + items:
> + - 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
additionalProperties: false.
> +
> +allOf:
> + - if:
> + properties:
> + compatible:
> + contains:
> + const: st,stm32f4-sai
> +
> + - then:
> + properties:
> + clocks:
> + minItems: 2
> + maxItems: 2
> +
> + clock-names:
> + items:
> + enum: [ x8k, x11k ]
Define the order.
> + minItems: 2
> + maxItems: 2
> +
> +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>
> + sai1: sai@...0a000 {
> + compatible = "st,stm32h7-sai";
> + #address-cells = <1>;
> + #size-cells = <1>;
> + ranges = <0 0x4400a000 0x400>;
> + reg = <0x4400a000 0x4>, <0x4400a3f0 0x10>;
> + interrupts = <GIC_SPI 87 IRQ_TYPE_LEVEL_HIGH>;
> + clocks = <&rcc SAI1>, <&rcc PLL1_Q>, <&rcc PLL2_P>;
> + clock-names = "pclk", "x8k", "x11k";
> + resets = <&rcc SAI1_R>;
> +
> + sai1a: audio-controller@...0a004 {
> + compatible = "st,stm32-sai-sub-a";
> + #sound-dai-cells = <0>;
> + reg = <0x4 0x1c>;
> + clocks = <&rcc SAI1_K>;
> + clock-names = "sai_ck";
> + dmas = <&dmamux1 87 0x400 0x01>;
> + dma-names = "tx";
> + };
> + };
> +
> +...
> --
> 2.17.1
>
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