linux-kernel - Re: [PATCHv4 3/4] dt-bindings: wiegand: add GPIO bitbanged Wiegand controller

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Date:   Wed, 10 May 2023 17:33:12 +0100
From:   Conor Dooley <conor@...nel.org>
To:     Martin Zaťovič <m.zatovic1@...il.com>
Cc:     linux-kernel@...r.kernel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        gregkh@...uxfoundation.org, beanhuo@...ron.com,
        nipun.gupta@....com, linus.walleij@...aro.org, mwen@...lia.com,
        bvanassche@....org, arnd@...db.de, ogabbay@...nel.org,
        linux@...y.sk, jacek.lawrynowicz@...ux.intel.com,
        geert+renesas@...der.be, benjamin.tissoires@...hat.com,
        masahiroy@...nel.org, yangyicong@...ilicon.com,
        devicetree@...r.kernel.org
Subject: Re: [PATCHv4 3/4] dt-bindings: wiegand: add GPIO bitbanged Wiegand
 controller

On Wed, May 10, 2023 at 06:22:42PM +0200, Martin Zaťovič wrote:
> GPIO bitbanged Wiegand controller requires definitions of GPIO
> lines to be used on top of the common Wiegand properties. Wiegand
> utilizes two such lines - D0(low data line) and D1(high data line).
> 
> Acked-by: Linus Walleij <linus.walleij@...aro.org>
> Signed-off-by: Martin Zaťovič <m.zatovic1@...il.com>
> ---
>  .../bindings/wiegand/wiegand-gpio.yaml        | 51 +++++++++++++++++++
>  MAINTAINERS                                   |  5 ++
>  2 files changed, 56 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/wiegand/wiegand-gpio.yaml
> 
> diff --git a/Documentation/devicetree/bindings/wiegand/wiegand-gpio.yaml b/Documentation/devicetree/bindings/wiegand/wiegand-gpio.yaml
> new file mode 100644
> index 000000000000..df28929f6dae
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/wiegand/wiegand-gpio.yaml
> @@ -0,0 +1,51 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/wiegand/wiegand-gpio.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: GPIO bitbanged Wiegand interface devicetree bindings

From the previous versions, drop "devicetree bindings".

> +
> +maintainers:
> +  - Martin Zaťovič <m.zatovic1@...il.com>
> +
> +description:
> +  This represents the GPIO lines used for bit-banged Wiegand on dedicated GPIO
> +  lines.
> +
> +allOf:
> +  - $ref: /schemas/wiegand/wiegand-controller.yaml#
> +
> +properties:
> +  compatible:
> +    const: wiegand-gpio
> +
> +  data-hi-gpios:
> +    description: GPIO used as Wiegands data-hi line.
> +    maxItems: 1
> +
> +  data-lo-gpios:
> +    description: GPIO used as Wiegands data-lo line.
> +    maxItems: 1
> +
> +required:
> +  - compatible
> +  - data-hi-gpios
> +  - data-lo-gpios
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/gpio/gpio.h>
> +
> +    wiegand@f00 {

Also as previously pointed out dt_binding_check doesn't like this:
Warning (unit_address_vs_reg): /example-0/wiegand@f00: node has a unit name, but no reg or ranges property

Cheers,
Conor.

> +        compatible = "wiegand-gpio";
> +        pulse-len-us = <50>;
> +        interval-len-us = <2000>;
> +        frame-gap-us = <2000>;
> +        data-lo-gpios = <&gpio2 6 (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)>;
> +        data-hi-gpios = <&gpio2 7 (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)>;
> +
> +        /* devices */
> +    };


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