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

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Date:   Mon, 14 Feb 2022 23:53:15 +0100
From:   Danilo Krummrich <danilokrummrich@...develop.de>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
Cc:     dmitry.torokhov@...il.com, robh+dt@...nel.org,
        devicetree@...r.kernel.org, linux-input@...r.kernel.org,
        linux-kernel@...r.kernel.org, linus.walleij@...aro.org
Subject: Re: [PATCH 1/2] dt-bindings: ps2-gpio: convert binding to json-schema

On Mon, Feb 14, 2022 at 10:49:27PM +0100, Krzysztof Kozlowski wrote:
> 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.
Yes, it does. I will fix those up and send a v2.
> 
> > +        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

- Danilo