linux-kernel - Re: [RFC 4/4] dt-bindings: gpio: Add bindings for SCMI pinctrl based gpio

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Date:   Mon, 2 Oct 2023 09:41:55 -0500
From:   Rob Herring <robh@...nel.org>
To:     AKASHI Takahiro <takahiro.akashi@...aro.org>
Cc:     sudeep.holla@....com, cristian.marussi@....com,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        linus.walleij@...aro.org, Oleksii_Moisieiev@...m.com,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org
Subject: Re: [RFC 4/4] dt-bindings: gpio: Add bindings for SCMI pinctrl based
 gpio

On Mon, Oct 02, 2023 at 11:16:02AM +0900, AKASHI Takahiro wrote:
> A dt binding for SCMI pinctrl based gpio driver is defined in this
> commit. It basically conforms to generic pinctrl-gpio mapping framework.

What is "generic pinctrl-gpio mapping framework"? DT doesn't have 
frameworks.

> 
> Signed-off-by: AKASHI Takahiro <takahiro.akashi@...aro.org>
> ---
>  .../bindings/gpio/arm,scmi-gpio.yaml          | 71 +++++++++++++++++++
>  1 file changed, 71 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/gpio/arm,scmi-gpio.yaml
> 
> diff --git a/Documentation/devicetree/bindings/gpio/arm,scmi-gpio.yaml b/Documentation/devicetree/bindings/gpio/arm,scmi-gpio.yaml
> new file mode 100644
> index 000000000000..2601c5594567
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/gpio/arm,scmi-gpio.yaml
> @@ -0,0 +1,71 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/gpio/arm,scmi-gpio.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: SCMI pinctrl based generic GPIO controller
> +
> +maintainers:
> +  - AKASHI Takahiro <akashi.takahiro@...aro.org>
> +
> +properties:
> +  $nodename:
> +    pattern: "^scmi_gpio(@[0-9a-f]+)$"

Not the correct name.

> +
> +  compatible:
> +    const: arm,scmi-gpio-generic

What makes it generic? No such thing. Just drop '-generic'.

> +
> +  gpio-controller: true
> +
> +  "#gpio-cells":
> +    const: 2
> +
> +  gpio-ranges: true
> +
> +  gpio-ranges-group-names: true
> +
> +patternProperties:
> +  "^.+-hog(-[0-9]+)?$":
> +    type: object
> +    properties:
> +      gpio-hog: true
> +      gpios: true
> +      input: true
> +      output-high: true
> +      output-low: true
> +      line-name: true
> +
> +    required:
> +      - gpio-hog
> +      - gpios

You don't need all this just 'required: [ gpio-hog ]'. Then the hog 
schema will check the rest.

> +
> +    additionalProperties: false
> +
> +required:
> +  - compatible
> +  - gpio-controller
> +  - "#gpio-cells"
> +  - gpio-ranges
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/gpio/gpio.h>
> +
> +    scmi_gpio_0: scmi_gpio@0 {

gpio {

But doesn't SCMI have protocol numbers?

> +        compatible = "arm,scmi-gpio";
> +        gpio-controller;
> +        #gpio-cells = <2>;
> +        gpio-ranges = <&scmi_pinctrl 0 10 5>,
> +                      <&scmi_pinctrl 5 0 0>;
> +        gpio-ranges-group-names = "",
> +                                  "pinmux_gpio";
> +    };
> +
> +    // Consumer:

Outside the scope of this binding. Drop this node.

> +    sdhci0_pwrseq {
> +        compatible = "mmc-pwrseq-emmc";
> +        reset-gpios = <&scmi_gpio_0 0 GPIO_ACTIVE_LOW>;
> +    };
> -- 
> 2.34.1
>