linux-kernel - Re: [PATCH 1/3] dt-bindings: add Wiegand controller dt-binding documentation

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Date:   Sun, 8 Jan 2023 10:30:11 -0600
From:   Rob Herring <robh@...nel.org>
To:     Martin Zaťovič <m.zatovic1@...il.com>
Cc:     linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        mani@...nel.org, hemantk@...eaurora.org, quic_jhugo@...cinc.com,
        andersson@...nel.org, Michael.Srba@...nam.cz, arnd@...db.de,
        dipenp@...dia.com, bvanassche@....org, iwona.winiarska@...el.com,
        ogabbay@...nel.org, tzimmermann@...e.de, fmdefrancesco@...il.com,
        jason.m.bills@...ux.intel.com, jae.hyun.yoo@...ux.intel.com,
        gregkh@...uxfoundation.org, krzysztof.kozlowski+dt@...aro.org
Subject: Re: [PATCH 1/3] dt-bindings: add Wiegand controller dt-binding
 documentation

On Wed, Jan 04, 2023 at 02:34:12PM +0100, Martin Zaťovič wrote:
> A Weigand bus is defined by a Wiegand controller node. This node
> can contain one or more device nodes for devices attached to
> the controller(it is advised to only connect one device as Wiegand
> is a point-to-point bus).
> 
> Wiegand controller needs to specify several attributes such as
> the pulse length in order to function properly. These attributes
> are documented here.

For the subject, drop 'dt-binding documentation'. That's already stated 
once.

> 
> Signed-off-by: Martin Zaťovič <m.zatovic1@...il.com>
> ---
>  .../bindings/wiegand/wiegand-controller.yaml  | 83 +++++++++++++++++++
>  MAINTAINERS                                   |  5 ++
>  2 files changed, 88 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/wiegand/wiegand-controller.yaml
> 
> diff --git a/Documentation/devicetree/bindings/wiegand/wiegand-controller.yaml b/Documentation/devicetree/bindings/wiegand/wiegand-controller.yaml
> new file mode 100644
> index 000000000000..645306c65d43
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/wiegand/wiegand-controller.yaml
> @@ -0,0 +1,83 @@
> +# SPDX-License-Identifier: GPL-2.0

(GPL-2.0 OR BSD-2-Clause)

> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/wiegand/wiegand-controller.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Wiegand Controller Generic Binding

s/Binding/Common Properties/

> +
> +maintainers:
> +  - Martin Zaťovič <martin.zatovic@...-biometrics.com>
> +
> +description: |

Don't need '|'.

> +  Wiegand busses can be described with a node for the Wiegand controller device
> +  and a set of child nodes for each SPI slave on the bus.
> +
> +properties:
> +  $nodename:
> +    pattern: "^wiegand(@.*|-[0-9a-f])*$"

'?' instead of '*' for the last '*'.

 
> +
> +  compatible:
> +    maxItems: 1

Drop 'compatible' as the specific controller has to list this anyways. 
Also, a controller can have as many compatible strings as it wants.

> +    description: Compatible of the Wiegand controller.
> +
> +  data-high-gpios:
> +    maxItems: 1
> +    description: GPIO used as Wiegands data-hi line. This line is initially
> +      pulled up to high value. Wiegand write of a bit of value 1 results in
> +      this line being pulled down for pulse length duration.
> +
> +  data-lo-gpios:
> +    maxItems: 1
> +    description: GPIO used as Wiegands data-lo line. This line is initially
> +      pulled up to high value. Wiegand write of a bit of value 0 results in
> +      this line being pulled down for pulse length duration.
> +
> +  pulse-len-us:
> +    maxItems: 1
> +    description: Length of the low pulse in microseconds.
> +
> +  interval-len-us:
> +    maxItems: 1
> +    description: Length of a whole bit (both the pulse and the high phase)
> +      in microseconds.
> +
> +  frame-gap-us:
> +    maxItems: 1
> +    description: Length of the last bit of a frame (both the pulse and the
> +      high phase) in microseconds.
> +
> +  slave-device:

A slave device should be named for the class of device it is, not 
'slave-device'. Just drop all of this as there's no way to match a node 
name.

> +    type: object
> +
> +    properties:
> +      compatible:
> +        description:
> +          Compatible of the Wiegand device.
> +
> +    required:
> +      - compatible
> +
> +required:
> +  - compatible
> +  - pulse-len-us
> +  - interval-len-us
> +  - frame-gap-us
> +
> +additionalProperties: false

Common bindings should be 'true'.

> +
> +examples:
> +  - |
> +    wiegand@f00 {
> +        compatible = "wiegand-gpio";
> +        data-hi-gpios = <&gpio2 7 (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)>;
> +        data-lo-gpios = <&gpio2 6 (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)>;
> +        pulse-len-us = <50>;
> +        interval-len-us = <2000>;
> +        frame-gap-us = <2000>;
> +        status = "okay";

Drop 'status'.

> +
> +        wiegand-foo-device {
> +                compatible = "wiegand-foo";
> +        };
> +    };
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 7f86d02cb427..db9624d93af0 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -22428,6 +22428,11 @@ L:	linux-input@...r.kernel.org
>  S:	Maintained
>  F:	drivers/hid/hid-wiimote*
>  
> +WIEGAND BUS DRIVER
> +M:	Martin Zaťovič <m.zatovic1@...il.com>
> +S:	Maintained
> +F:	Documentation/devicetree/bindings/wiegand/wiegand-controller.yaml
> +
>  WILOCITY WIL6210 WIRELESS DRIVER
>  L:	linux-wireless@...r.kernel.org
>  S:	Orphan
> -- 
> 2.38.1
> 
>