linux-kernel - Re: [PATCH 1/2] dt-bindings: ps2-gpio: convert binding to json-schema

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Date:   Mon, 14 Feb 2022 22:49:27 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
To:     Danilo Krummrich <danilokrummrich@...develop.de>,
        dmitry.torokhov@...il.com, robh+dt@...nel.org,
        devicetree@...r.kernel.org, linux-input@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     linus.walleij@...aro.org
Subject: Re: [PATCH 1/2] dt-bindings: ps2-gpio: convert binding to json-schema

On 12/02/2022 00:31, Danilo Krummrich wrote:
> Convert the ps2-gpio dt-binding documentation to DT schema format using
> the json-schema.
> 
> Signed-off-by: Danilo Krummrich <danilokrummrich@...develop.de>
> ---
>  .../devicetree/bindings/serio/ps2-gpio.txt    | 23 --------
>  .../devicetree/bindings/serio/ps2-gpio.yaml   | 52 +++++++++++++++++++
>  2 files changed, 52 insertions(+), 23 deletions(-)
>  delete mode 100644 Documentation/devicetree/bindings/serio/ps2-gpio.txt
>  create mode 100644 Documentation/devicetree/bindings/serio/ps2-gpio.yaml
> 
> diff --git a/Documentation/devicetree/bindings/serio/ps2-gpio.txt b/Documentation/devicetree/bindings/serio/ps2-gpio.txt
> deleted file mode 100644
> index 7b7bc9cdf986..000000000000
> --- a/Documentation/devicetree/bindings/serio/ps2-gpio.txt
> +++ /dev/null
> @@ -1,23 +0,0 @@
> -Device-Tree binding for ps/2 gpio device
> -
> -Required properties:
> -	- compatible = "ps2-gpio"
> -	- data-gpios: the data pin
> -	- clk-gpios: the clock pin
> -	- interrupts: Should trigger on the falling edge of the clock line.
> -
> -Optional properties:
> -	- write-enable: Indicates whether write function is provided
> -	to serio device. Possibly providing the write fn will not work, because
> -	of the tough timing requirements.
> -
> -Example nodes:
> -
> -ps2@0 {
> -	compatible = "ps2-gpio";
> -	interrupt-parent = <&gpio>;
> -	interrupts = <23 IRQ_TYPE_EDGE_FALLING>;
> -	data-gpios = <&gpio 24 GPIO_ACTIVE_HIGH>;
> -	clk-gpios = <&gpio 23 GPIO_ACTIVE_HIGH>;
> -	write-enable;
> -};
> diff --git a/Documentation/devicetree/bindings/serio/ps2-gpio.yaml b/Documentation/devicetree/bindings/serio/ps2-gpio.yaml
> new file mode 100644
> index 000000000000..ec6fa7b40851
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/serio/ps2-gpio.yaml
> @@ -0,0 +1,52 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/serio/ps2-gpio.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Bindings for GPIO based PS/2
> +
> +maintainers:
> +  - Danilo Krummrich <danilokrummrich@...develop.de>
> +
> +properties:
> +  compatible:
> +    items:

Hi,

I think you do not expect more compatibles, so skip "items".

> +      - const: ps2-gpio
> +
> +  data-gpios:
> +    description:
> +      the gpio used for the data signal
> +    maxItems: 1
> +
> +  clk-gpios:
> +    description:
> +      the gpio used for the clock signal
> +    maxItems: 1
> +
> +  interrupts:
> +    description:
> +      The given interrupt should trigger on the falling edge of the clock line.
> +    maxItems: 1
> +
> +  write-enable:

This does not look like a standard property. You need "type: boolean".

> +    description:
> +      Indicates whether write function is provided to serio device. Possibly
> +      providing the write function will not work, because of the tough timing
> +      requirements.
> +
> +required:

Also: compatible

> +  - data-gpios
> +  - clk-gpios
> +  - interrupts
> +
> +examples:
> +  - |
> +    ps2@0 {

Does it compile cleanly? You used an unit-address but there is no reg.

> +        compatible = "ps2-gpio";
> +        interrupt-parent = <&gpio>;
> +        interrupts = <23 IRQ_TYPE_EDGE_FALLING>;
> +        data-gpios = <&gpio 24 GPIO_ACTIVE_HIGH>;
> +        clk-gpios = <&gpio 23 GPIO_ACTIVE_HIGH>;
> +        write-enable;
> +    };


Best regards,
Krzysztof