linux-kernel - Re: [PATCH] dt-bindings: spi: convert spi-jcore to dtschema

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Message-ID: <1009fc1b-59f4-408e-9c2d-486e1886ce48@linaro.org>
Date: Thu, 21 Mar 2024 15:00:41 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Kousik Sanagavarapu <five231003@...il.com>, linux-kernel@...r.kernel.org
Cc: devicetree@...r.kernel.org, linux-spi@...r.kernel.org,
 Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Mark Brown <broonie@...nel.org>, Shuah Khan <skhan@...uxfoundation.org>,
 Javier Carrasco <javier.carrasco.cruz@...il.com>
Subject: Re: [PATCH] dt-bindings: spi: convert spi-jcore to dtschema

On 21/03/2024 14:47, Kousik Sanagavarapu wrote:
> Convert existing bindings of J-Core spi2 to dtschema.  No new properties
> are added.

Subject:
spi: dt-bindings: jcore,spi:

> 
> Signed-off-by: Kousik Sanagavarapu <five231003@...il.com>
> ---
>  .../devicetree/bindings/spi/jcore,spi.txt     | 34 -----------
>  .../devicetree/bindings/spi/jcore,spi.yaml    | 60 +++++++++++++++++++
>  2 files changed, 60 insertions(+), 34 deletions(-)
>  delete mode 100644 Documentation/devicetree/bindings/spi/jcore,spi.txt
>  create mode 100644 Documentation/devicetree/bindings/spi/jcore,spi.yaml
> 


> diff --git a/Documentation/devicetree/bindings/spi/jcore,spi.yaml b/Documentation/devicetree/bindings/spi/jcore,spi.yaml
> new file mode 100644
> index 000000000000..e76775bb68d4
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/spi/jcore,spi.yaml
> @@ -0,0 +1,60 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +
> +$id: http://devicetree.org/schemas/spi/jcore,spi.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: J-Core SPI controller
> +
> +description: |

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

> +  The J-Core "spi2" device is a PIO-based SPI controller which used to
> +  perform byte-at-a-time transfers between the CPU and itself.
> +
> +maintainers:
> +  - Kousik Sanagavarapu <five231003@...il.com>
> +
> +allOf:
> +  - $ref: spi-controller.yaml#
> +
> +properties:
> +  compatible:
> +    const: jcore,spi2
> +
> +  reg:
> +    maxItems: 1
> +
> +  clocks:
> +    description:
> +      If a phandle named "ref_clk" is present, SPI clock speed
> +      programming is relative to the frequency of the indicated clock.
> +      Necessary only if the input clock rate is something other than a
> +      fixed 50 MHz.
> +
> +  clock-names:
> +    description:
> +      Clock names, one for each phandle in clocks.

Drop description, but instead provide a name. See existing code.

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

Drop

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

Drop

Please do not write bindings in entirely different way than existing
ones are written. Open existing recent bindings and look there.

> +
> +required:
> +  - compatible
> +  - reg
> +
> +additionalProperties: true

This cannot be true. From which existing code did you take it? What you
need here is unevaluatedProperties: false.

> +
> +examples:
> +  - |
> +    spi@40 {
> +      compatible = "jcore,spi2";
> +      #address-cells = <1>;
> +      #size-cells = <0>;
> +      reg = <0x40 0x8>;

Keep reg the second property.

> +      spi-max-frequency = <25000000>;
> +      clocks = <&bus_clk>;
> +      clock-names = "ref_clk";
> +    };

Best regards,
Krzysztof