linux-kernel - Re: [PATCH v2 2/2] dt-bindings: gpio: Add devicetree binding for IDT 79RC3243x GPIO controller

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Date:   Wed, 21 Apr 2021 12:17:27 -0500
From:   Rob Herring <robh@...nel.org>
To:     Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        linux-gpio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/2] dt-bindings: gpio: Add devicetree binding for IDT
 79RC3243x GPIO controller

On Wed, Apr 21, 2021 at 06:20:26PM +0200, Thomas Bogendoerfer wrote:
> Add YAML devicetree binding for IDT 79RC3243x GPIO controller
> 
> Signed-off-by: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
> ---
>  .../bindings/gpio/gpio-idt3243x.yaml          | 73 +++++++++++++++++++

Use compatible string for filename.

>  1 file changed, 73 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/gpio/gpio-idt3243x.yaml
> 
> diff --git a/Documentation/devicetree/bindings/gpio/gpio-idt3243x.yaml b/Documentation/devicetree/bindings/gpio/gpio-idt3243x.yaml
> new file mode 100644
> index 000000000000..346a57ef8298
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/gpio/gpio-idt3243x.yaml
> @@ -0,0 +1,73 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/gpio/gpio-idt3243x.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: IDT 79RC32434x GPIO controller
> +
> +maintainers:
> +  - Thomas Bogendoerfer <tsbogend@...ha.franken.de>
> +
> +properties:
> +  compatible:
> +    const: idt,3243x-gpio

What's the 'x'? Generally, we don't do wildcards for compatible strings.

> +
> +  reg:
> +    maxItems: 2
> +
> +  reg-names:
> +    items:
> +      - const: gpio
> +      - const: pic
> +
> +  gpio-controller: true
> +
> +  "#gpio-cells":
> +    const: 2
> +
> +  ngpios:
> +    description:
> +      Number of available gpios in a bank.

That's every 'ngpios'. Drop.

> +    minimum: 1
> +    maximum: 32
> +
> +  interrupt-controller: true
> +
> +  "#interrupt-cells":
> +    const: 2
> +
> +  interrupts:
> +    maxItems: 1
> +
> +required:
> +  - compatible
> +  - reg
> +  - reg-names
> +  - gpio-controller
> +  - "#gpio-cells"
> +  - ngpios
> +  - interrupt-controller
> +  - "#interrupt-cells"
> +  - interrupts
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    gpio0: interrupt-controller@...00 {

gpio@...

As generally it's primarily a GPIO controller and secondarily an 
interrupt controller.

> +        compatible = "idt,3243x-gpio";
> +        reg = <0x50000 0x14>, <0x38030 0x0c>;
> +        reg-names = "gpio", "pic";
> +
> +        interrupt-controller;
> +        #interrupt-cells = <2>;
> +
> +        interrupt-parent = <&cpuintc>;
> +        interrupts = <6>;
> +
> +        gpio-controller;
> +        #gpio-cells = <2>;
> +
> +        ngpios = <14>;
> +    };
> -- 
> 2.29.2
>