linux-kernel - Re: [PATCH v2 2/2] dt-bindings: pinctrl: Add bindings for Awinic AW9523/AW9523B

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Date:   Tue, 12 Jan 2021 20:41:18 -0600
From:   Rob Herring <robh@...nel.org>
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...ainline.org>
Cc:     linus.walleij@...aro.org, linux-kernel@...r.kernel.org,
        konrad.dybcio@...ainline.org, marijn.suijten@...ainline.org,
        martin.botka@...ainline.org, phone-devel@...r.kernel.org,
        linux-gpio@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v2 2/2] dt-bindings: pinctrl: Add bindings for Awinic
 AW9523/AW9523B

On Mon, Jan 11, 2021 at 07:29:28PM +0100, AngeloGioacchino Del Regno wrote:
> Add bindings for the Awinic AW9523/AW9523B I2C GPIO Expander driver.
> 
> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...ainline.org>
> ---
>  .../pinctrl/awinic,aw9523-pinctrl.yaml        | 112 ++++++++++++++++++
>  1 file changed, 112 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/pinctrl/awinic,aw9523-pinctrl.yaml
> 
> diff --git a/Documentation/devicetree/bindings/pinctrl/awinic,aw9523-pinctrl.yaml b/Documentation/devicetree/bindings/pinctrl/awinic,aw9523-pinctrl.yaml
> new file mode 100644
> index 000000000000..a705c05bb5a2
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pinctrl/awinic,aw9523-pinctrl.yaml
> @@ -0,0 +1,112 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/pinctrl/awinic,aw9523-pinctrl.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Awinic AW9523/AW9523B I2C GPIO Expander
> +
> +maintainers:
> +  - AngeloGioacchino Del Regno <angelogioacchino.delregno@...ainline.org>
> +
> +description: |
> +  The Awinic AW9523/AW9523B I2C GPIO Expander featuring 16 multi-function
> +  I/O, 256 steps PWM mode and interrupt support.
> +
> +properties:
> +  compatible:
> +    const: awinic,aw9523-pinctrl
> +
> +  reg:
> +    maxItems: 1
> +
> +  '#gpio-cells':
> +    description: |
> +      Specifying the pin number and flags, as defined in
> +      include/dt-bindings/gpio/gpio.h
> +    const: 2
> +
> +  gpio-controller: true
> +
> +  gpio-ranges:
> +    maxItems: 1
> +
> +  interrupt-controller: true
> +
> +  interrupts:
> +    maxItems: 1
> +    description: Specifies the INTN pin IRQ.
> +
> +  '#interrupt-cells':
> +    description:
> +      Specifies the PIN numbers and Flags, as defined in defined in
> +      include/dt-bindings/interrupt-controller/irq.h
> +    const: 2
> +
> +#PIN CONFIGURATION NODES
> +patternProperties:
> +  '^.*$':
> +    if:
> +      type: object
> +      $ref: "/schemas/pinctrl/pincfg-node.yaml"
> +    then:

I wish people would stop copying this if/then hack...

For new bindings, just name your nodes something sensible you can match 
on like '-pins$'.

> +      properties:
> +        pins:
> +          description:
> +            List of gpio pins affected by the properties specified in
> +            this subnode.
> +          items:
> +            pattern: "^gpio([0-9]|1[0-5])$"
> +          minItems: 1
> +          maxItems: 16
> +
> +        function:
> +          description:
> +            Specify the alternative function to be configured for the
> +            specified pins.
> +
> +          enum: [ gpio, pwm ]
> +
> +        bias-disable: true
> +        bias-pull-down: true
> +        bias-pull-up: true
> +        drive-open-drain: true
> +        drive-push-pull: true
> +        input-enable: true
> +        output-high: true
> +        output-low: true
> +
> +      required:
> +        - pins
> +        - function
> +
> +      additionalProperties: false
> +
> +required:
> +  - compatible
> +  - reg
> +  - gpio-controller
> +  - '#gpio-cells'
> +  - gpio-ranges
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/gpio/gpio.h>
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +
> +    i2c_node {
> +        gpio-expander@58 {
> +                compatible = "awinic,aw9523-pinctrl";
> +                reg = <0x58>;
> +                interrupt-parent = <&tlmm>;
> +                interrupts = <50 IRQ_TYPE_EDGE_FALLING>;
> +                gpio-controller;
> +                #gpio-cells = <2>;
> +                gpio-ranges = <&tlmm 0 0 16>;
> +                interrupt-controller;
> +                #interrupt-cells = <2>;
> +                reset-gpios = <&tlmm 51 GPIO_ACTIVE_HIGH>;
> +        };
> +    };
> -- 
> 2.29.2
>