linux-kernel - Re: [PATCH v2 1/7] dt-bindings: sound: sophgo: add CV1800B I2S/TDM controller binding

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Message-ID: <20260118-famous-magnificent-peccary-474ba8@quoll>
Date: Sun, 18 Jan 2026 11:14:34 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: "Anton D. Stavinskii" <stavinsky@...il.com>
Cc: Liam Girdwood <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>, 
	Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
	Conor Dooley <conor+dt@...nel.org>, Chen Wang <unicorn_wang@...look.com>, 
	Inochi Amaoto <inochiama@...il.com>, Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>, 
	Paul Walmsley <pjw@...nel.org>, Palmer Dabbelt <palmer@...belt.com>, 
	Albert Ou <aou@...s.berkeley.edu>, Alexandre Ghiti <alex@...ti.fr>, linux-sound@...r.kernel.org, 
	devicetree@...r.kernel.org, sophgo@...ts.linux.dev, linux-kernel@...r.kernel.org, 
	linux-riscv@...ts.infradead.org
Subject: Re: [PATCH v2 1/7] dt-bindings: sound: sophgo: add CV1800B I2S/TDM
 controller binding

On Sun, Jan 18, 2026 at 12:18:53AM +0400, Anton D. Stavinskii wrote:
> Purpose: introduce DT schema for the CPU driver

Bindings are for hardware, not drivers. Drop the purpose.

> The driver uses dma to transfer data. The dma it self has 8 channels.

Describe the hardware.


> Each channel can be connected only to a specific i2s node. But each
> of dma channel can have multiple purposes so in order to save dma
> channels the configurations allows to use tx and rx, only rx, only tx
> or none channels. I2S controller without channels can be useful in
> configuration where I2S is used as clock source only and doesn't
> produce any data.

Please use subject prefixes matching the subsystem. You can get them for
example with 'git log --oneline -- DIRECTORY_OR_FILE' on the directory
your patch is touching. For bindings, the preferred subjects are
explained here:
https://www.kernel.org/doc/html/latest/devicetree/bindings/submitting-patches.html#i-for-patch-submitters

A nit, subject: drop second/last, redundant "binding". The
"dt-bindings" prefix is already stating that these are bindings.
See also:
https://elixir.bootlin.com/linux/v6.17-rc3/source/Documentation/devicetree/bindings/submitting-patches.rst#L18

> 
> Signed-off-by: Anton D. Stavinskii <stavinsky@...il.com>
> ---
>  .../bindings/sound/sophgo,cv1800b-i2s.yaml         | 75 ++++++++++++++++++++++
>  1 file changed, 75 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/sound/sophgo,cv1800b-i2s.yaml b/Documentation/devicetree/bindings/sound/sophgo,cv1800b-i2s.yaml
> new file mode 100644
> index 000000000000..cf30880a62da
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/sound/sophgo,cv1800b-i2s.yaml
> @@ -0,0 +1,75 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/sound/sophgo,cv1800b-i2s.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Sophgo CV1800B I2S/TDM controller
> +
> +maintainers:
> +  - Anton D. Stavinskii <stavinsky@...il.com>
> +
> +description: |

Do not need '|' unless you need to preserve formatting.

> +  I2S/TDM controller found in CV1800B / Sophgo SG2002/SG2000 SoCs.
> +

Miss allOf with ref to dai-common.

> +properties:
> +  compatible:
> +    const: sophgo,cv1800b-i2s
> +
> +  reg:
> +    maxItems: 1
> +
> +  "#sound-dai-cells":
> +    const: 0
> +
> +  clocks:
> +    minItems: 1
> +    maxItems: 2

1. Why is it flexible?

2. And then why names are not flexible. These should be synced in
constraints.

> +
> +  clock-names:
> +    items:
> +      - const: i2s
> +      - const: mclk
> +
> +  dmas:
> +    maxItems: 2
> +
> +  dma-names:
> +    description: |
> +      Names of DMA channels. May be omitted. If present, one entry
> +      selects a single direction, while two entries select RX and TX.

Drop desription. Don't repeat constraints in free form text.

> +    minItems: 1
> +    maxItems: 2

Again, messed constraints.

> +    items:
> +      enum: [rx, tx]

No, it has to be a specific/fixed list.

> +
> +  "#address-cells":
> +    const: 1
> +
> +  "#size-cells":
> +    const: 0

Why? Drop these.

> +
> +required:
> +  - compatible
> +  - reg
> +  - clocks
> +  - clock-names
> +  - "#sound-dai-cells"
> +
> +additionalProperties: false

unevaluatedProperties instead

> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/sophgo,cv1800.h>
> +
> +    i2s1: i2s@...0000 {

Drop unused label.

> +        compatible = "sophgo,cv1800b-i2s";
> +        reg = <0x04110000 0x10000>;
> +        #address-cells = <1>;
> +        #size-cells = <0>;

Drop useless properties.

Best regards,
Krzysztof