linux-kernel - Re: [PATCH v1 1/2] dt-bindings: gpio: add fcs,fxl6408-gpio binding document

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Date:   Mon, 6 Mar 2023 09:41:50 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Francesco Dolcini <francesco@...cini.it>,
        linux-gpio@...r.kernel.org, devicetree@...r.kernel.org
Cc:     Emanuele Ghidoli <emanuele.ghidoli@...adex.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 1/2] dt-bindings: gpio: add fcs,fxl6408-gpio binding
 document

On 06/03/2023 09:34, Francesco Dolcini wrote:
> From: Emanuele Ghidoli <emanuele.ghidoli@...adex.com>
> 
> Add binding document for Fairchild FXL6408 GPIO expander.

Subject: drop second/last, redundant "binding document". The
"dt-bindings" prefix is already stating that these are bindings.

> 
> Signed-off-by: Emanuele Ghidoli <emanuele.ghidoli@...adex.com>

Missing SoB.

> ---
>  .../bindings/gpio/fcs,fxl6408-gpio.yaml       | 73 +++++++++++++++++++
>  1 file changed, 73 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/gpio/fcs,fxl6408-gpio.yaml
> 
> diff --git a/Documentation/devicetree/bindings/gpio/fcs,fxl6408-gpio.yaml b/Documentation/devicetree/bindings/gpio/fcs,fxl6408-gpio.yaml
> new file mode 100644
> index 000000000000..ccf946040d00
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/gpio/fcs,fxl6408-gpio.yaml
> @@ -0,0 +1,73 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/gpio/fcs,fxl6408-gpio.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: FXL6408 GPIO driver

If "driver" means Linux driver, then drop.

Fairchild FXL6408 GPIO Expander

> +
> +maintainers:
> +  - Emanuele Ghidoli <emanuele.ghidoli@...adex.com>
> +
> +description: |
> +  Driver for Fairchild FXL6408 GPIO expander

This is not a driver. Drop entire description as it is duplicating title
or add here something useful.


> +
> +properties:
> +  compatible:
> +    enum:
> +      - fcs,fxl6408
> +
> +  reg:
> +    maxItems: 1
> +
> +  "#gpio-cells":
> +    const: 2
> +
> +  gpio-controller: true
> +
> +  gpio-line-names:
> +    minItems: 1
> +    maxItems: 8
> +
> +patternProperties:
> +  "^(hog-[0-9]+|.+-hog(-[0-9]+)?)$":

>From here....

> +    type: object
> +    properties:
> +      gpio-hog: true
> +      gpios: true
> +      input: true
> +      output-high: true
> +      output-low: true
> +      line-name: true
> +
> +    required:
> +      - gpio-hog
> +      - gpios
> +
> +    additionalProperties: false

To here, all this can be simpler:

  "^(hog-[0-9]+|.+-hog(-[0-9]+)?)$":
    required:
      - gpio-hog

which selects gpio hog schema.

> +
> +required:
> +  - compatible
> +  - reg
> +  - gpio-controller
> +  - "#gpio-cells"
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    i2c {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        gpio_expander_43: gpio-expander@43 {
> +            compatible = "fcs,fxl6408";
> +            gpio-controller;
> +            #gpio-cells = <2>;
> +            reg = <0x43>;
> +            gpio-line-names = "Wi-Fi_W_DISABLE", "Wi-Fi_WKUP_WLAN",
> +              "PWR_EN_+V3.3_WiFi_N", "PCIe_REF_CLK_EN",

Align with previous line/entries.

> +              "USB_RESET_N", "USB_BYPASS_N", "Wi-Fi_PDn",
> +              "Wi-Fi_WKUP_BT";
> +        };
> +    };

Best regards,
Krzysztof