linux-kernel - Re: [PATCH v2 2/4] dt-bindings: auxdisplay: Add bindings for generic 7 segment LED

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Date: Wed, 28 Feb 2024 08:04:23 -0600
From: Rob Herring <robh@...nel.org>
To: Chris Packham <chris.packham@...iedtelesis.co.nz>
Cc: andy@...nel.org, geert@...ux-m68k.org,
	krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
	andrew@...n.ch, gregory.clement@...tlin.com,
	sebastian.hesselbarth@...il.com, ojeda@...nel.org,
	tzimmermann@...e.de, javierm@...hat.com, robin@...tonic.nl,
	lee@...nel.org, pavel@....cz, devicetree@...r.kernel.org,
	linux-leds@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 2/4] dt-bindings: auxdisplay: Add bindings for generic
 7 segment LED

On Wed, Feb 28, 2024 at 10:22:42AM +1300, Chris Packham wrote:
> Add bindings for a generic 7 segment LED display using GPIOs.
> 
> Signed-off-by: Chris Packham <chris.packham@...iedtelesis.co.nz>
> ---
> 
> Notes:
>     Changes in v2:
>     - Use compatible = "generic-gpio-7seg" to keep checkpatch.pl happy
> 
>  .../auxdisplay/generic-gpio-7seg.yaml         | 40 +++++++++++++++++++
>  1 file changed, 40 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/auxdisplay/generic-gpio-7seg.yaml
> 
> diff --git a/Documentation/devicetree/bindings/auxdisplay/generic-gpio-7seg.yaml b/Documentation/devicetree/bindings/auxdisplay/generic-gpio-7seg.yaml
> new file mode 100644
> index 000000000000..46d53ebdf413
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/auxdisplay/generic-gpio-7seg.yaml
> @@ -0,0 +1,40 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/auxdisplay/generic,gpio-7seg.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: GPIO based LED segment display
> +
> +maintainers:
> +  - Chris Packham <chris.packham@...iedtelesis.co.nz>
> +
> +properties:
> +  compatible:
> +    const: generic-gpio-7seg

'generic' doesn't add anything of value. 7seg is kind of vague. So, 
gpio-7-segment?


> +
> +  segment-gpios:
> +    description:
> +      An array of GPIOs one per segment.
> +    minItems: 7

How does one know which GPIO is which segment?

Rob