linux-kernel - Re: [PATCH 1/2] dt-bindings: pinctrl: Add DT bindings for apple,pinctrl

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Date:   Mon, 10 May 2021 09:03:13 -0400
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
To:     Mark Kettenis <kettenis@...nbsd.org>, devicetree@...r.kernel.org
Cc:     Hector Martin <marcan@...can.st>,
        Linus Walleij <linus.walleij@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-gpio@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: pinctrl: Add DT bindings for
 apple,pinctrl

On 08/05/2021 10:19, Mark Kettenis wrote:
> The Apple GPIO controller is a simple combined pin and GPIO conroller
> present on Apple ARM SoC platforms, including various iPhone and iPad
> devices and the "Apple Silicon" Macs.
> 
> Signed-off-by: Mark Kettenis <kettenis@...nbsd.org>
> ---
>  .../bindings/pinctrl/apple,pinctrl.yaml       | 103 ++++++++++++++++++
>  MAINTAINERS                                   |   2 +
>  include/dt-bindings/pinctrl/apple.h           |  13 +++
>  3 files changed, 118 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/pinctrl/apple,pinctrl.yaml
>  create mode 100644 include/dt-bindings/pinctrl/apple.h
> 
> diff --git a/Documentation/devicetree/bindings/pinctrl/apple,pinctrl.yaml b/Documentation/devicetree/bindings/pinctrl/apple,pinctrl.yaml
> new file mode 100644
> index 000000000000..cc7805ca6ba1
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pinctrl/apple,pinctrl.yaml
> @@ -0,0 +1,103 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/pinctrl/apple,pinctrl.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Apple GPIO controller
> +
> +maintainers:
> +  - Mark Kettenis <kettenis@...nbsd.org>
> +
> +description: |
> +  The Apple GPIO controller is a simple combined pin and GPIO conroller
> +  present on Apple ARM SoC platforms, including various iPhone and iPad
> +  devices and the "Apple Silicon" Macs.
> +
> +properties:
> +  compatible:
> +    items:
> +      - const: apple,t8103-pinctrl
> +      - const: apple,pinctrl

What is the point of having very generic final compatible in the binding
which does not relate to actual hardware?

Let's say next SoC will be
apple,x-abcd-foo-2323-whatever-nothing-in-common and you still have to
use generic "apple,pinctrl" even though HW is not at all compatible?
This looks like wildcard, not HW description.


Best regards,
Krzysztof