linux-kernel - Re: [RFC PATCH 2/3] dt-bindings: gpio: Add binding documentation for Etron EJ168/EJ188/EJ198

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Date:   Tue, 6 Oct 2020 16:25:02 -0500
From:   Rob Herring <robh@...nel.org>
To:     Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Cc:     linux-pci@...r.kernel.org, devicetree@...r.kernel.org,
        linux-gpio@...r.kernel.org, bgolaszewski@...libre.com,
        linus.walleij@...aro.org, linux-kernel@...r.kernel.org,
        bhelgaas@...gle.com
Subject: Re: [RFC PATCH 2/3] dt-bindings: gpio: Add binding documentation for
 Etron EJ168/EJ188/EJ198

On Sun, Oct 04, 2020 at 06:29:07PM +0200, Martin Blumenstingl wrote:
> Etron EJ168/EJ188/EJ198 are USB xHCI host controllers which embed a GPIO
> controller.
> 
> Signed-off-by: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
> ---
>  .../devicetree/bindings/gpio/etron,ej1x8.yaml | 48 +++++++++++++++++++
>  1 file changed, 48 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/gpio/etron,ej1x8.yaml
> 
> diff --git a/Documentation/devicetree/bindings/gpio/etron,ej1x8.yaml b/Documentation/devicetree/bindings/gpio/etron,ej1x8.yaml
> new file mode 100644
> index 000000000000..fa554045bdb5
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/gpio/etron,ej1x8.yaml
> @@ -0,0 +1,48 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/gpio/etron,ej1x8.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: GPIO controller embedded into the EJ168/EJ188/EJ198 xHCI controllers
> +
> +maintainers:
> +  - Martin Blumenstingl <martin.blumenstingl@...glemail.com>
> +
> +properties:
> +  compatible:
> +    enum:
> +      - pci1b6f,7023
> +      - pci1b6f,7052
> +
> +  reg:
> +    maxItems: 1
> +
> +  "#gpio-cells":
> +    const: 2
> +
> +  gpio-controller: true
> +
> +required:
> +  - compatible
> +  - reg
> +  - "#gpio-cells"
> +  - gpio-controller
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +      pcie {
> +        #address-cells = <3>;
> +        #size-cells = <2>;
> +
> +        gpio@0,0,0 {
> +          compatible = "pci1b6f,7023";
> +          reg = <0x0 0x0 0x0 0x0 0x1000>;
> +          gpio-controller;
> +          #gpio-cells = <2>;
> +        };

How would this look if you needed to describe the XHCI controller? 
That's another PCI function?

> +      };
> +
> +...
> -- 
> 2.28.0
>