linux-kernel - Re: [PATCH] dt-bindings: gpio: mpfs-gpio: allow parsing of hog child nodes.

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Date:   Thu, 25 Aug 2022 15:10:28 +0300
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Conor Dooley <mail@...chuod.ie>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor.dooley@...rochip.com>
Cc:     linux-gpio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dt-bindings: gpio: mpfs-gpio: allow parsing of hog child
 nodes.

On 20/08/2022 23:41, Conor Dooley wrote:
> From: Conor Dooley <conor.dooley@...rochip.com>
> 
> The SD card and eMMC on PolarFire SoC based dev boards are sometimes
> statically muxed using a GPIO. To facilitate this, enable gpio-hog
> child node properties.
> 
> Signed-off-by: Conor Dooley <conor.dooley@...rochip.com>
> ---
>  .../bindings/gpio/microchip,mpfs-gpio.yaml     | 18 ++++++++++++++++++
>  1 file changed, 18 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/gpio/microchip,mpfs-gpio.yaml b/Documentation/devicetree/bindings/gpio/microchip,mpfs-gpio.yaml
> index 110651eafa70..6704a7a52cd0 100644
> --- a/Documentation/devicetree/bindings/gpio/microchip,mpfs-gpio.yaml
> +++ b/Documentation/devicetree/bindings/gpio/microchip,mpfs-gpio.yaml
> @@ -44,6 +44,24 @@ properties:
>  
>    gpio-controller: true
>  
> +patternProperties:
> +  "^.+-hog(?:-[0-9]+)?$":

What is this pattern about: "(?:" ?

> +    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

Put it after type:object. Easier to read/find.

Best regards,
Krzysztof