linux-kernel - Re: [PATCH v2 1/2] dt-binding: Add cypress,cy8c95x0 binding

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Date:   Wed, 15 Jun 2022 07:20:45 -0700
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Patrick Rudolph <patrick.rudolph@...ements.com>,
        Linus Walleij <linus.walleij@...aro.org>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-gpio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] dt-binding: Add cypress,cy8c95x0 binding

On 15/06/2022 03:49, Patrick Rudolph wrote:
> Added device tree binding documentation for
> Cypress CY8C95x0 I2C pin-controller.
> 
> Signed-off-by: Patrick Rudolph <patrick.rudolph@...ements.com>

The subject is still wrong. You need subsystem prefix (pinctrl) and you
can skip final "binding" word, as it is implied by dt-bindings.

> ---
>  .../bindings/pinctrl/cypress,cy8c95x0.yaml    | 131 ++++++++++++++++++
>  1 file changed, 131 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/pinctrl/cypress,cy8c95x0.yaml
> 
> diff --git a/Documentation/devicetree/bindings/pinctrl/cypress,cy8c95x0.yaml b/Documentation/devicetree/bindings/pinctrl/cypress,cy8c95x0.yaml
> new file mode 100644
> index 000000000000..765e8834d9dd
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pinctrl/cypress,cy8c95x0.yaml
> @@ -0,0 +1,131 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/pinctrl/cypress,cy8c95x0.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Cypress CY8C95X0 I2C GPIO expander
> +
> +maintainers:
> +  - Patrick Rudolph <patrick.rudolph@...ements.com>
> +
> +description: |
> +  This supports the 20/40/60 pin Cypress CYC95x0 GPIO I2C expanders.
> +  Pin function configuration is performed on a per-pin basis.
> +
> +properties:
> +  compatible:
> +    enum:
> +      - cypress,cy8c9520
> +      - cypress,cy8c9540
> +      - cypress,cy8c9560
> +
> +  reg:
> +    maxItems: 1
> +
> +  gpio-controller: true
> +
> +  '#gpio-cells':
> +    description:
> +      The first cell is the GPIO number and the second cell specifies GPIO
> +      flags, as defined in <dt-bindings/gpio/gpio.h>.
> +    const: 2
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  interrupt-controller: true
> +
> +  '#interrupt-cells':
> +    const: 2
> +
> +  gpio-line-names: true
> +
> +  gpio-ranges:
> +    maxItems: 1
> +
> +  gpio-reserved-ranges:
> +    maxItems: 1
> +
> +  vdd-supply:
> +    description:
> +      Optional power supply.
> +
> +patternProperties:
> +  '-pins$':
> +    type: object
> +    description:
> +      Pinctrl node's client devices use subnodes for desired pin configuration.
> +      Client device subnodes use below standard properties.
> +    $ref: "/schemas/pinctrl/pincfg-node.yaml"

Skip quotes.

> +
> +    properties:
> +      pins:
> +        description:
> +          List of gpio pins affected by the properties specified in this
> +          subnode.
> +        items:
> +          - pattern: "^gp([0-7][0-7])$"

Use the same type of quotes everywhere - either ' or ". Does it actually
work? It looks like you allow here only one pin but the description
suggests it is a list of pins. I think you wanted here just "pattern:
..." without leading minus. Then you need also min and maxItems.

Why blank line here disappeared? My comment was in different place.

> +      function:
> +        description:
> +          Specify the alternative function to be configured for the specified
> +          pins.
> +        enum: [ gpio, pwm ]
> +
> +      bias-pull-down: true
> +
> +      bias-pull-up: true
> +
> +      bias-disable: true
> +
> +      output-high: true
> +
> +      output-low: true
> +
> +      drive-push-pull: true
> +
> +      drive-open-drain: true
> +
> +      drive-open-source: true
> +
> +    required:
> +      - pins
> +      - function
> +
> +    additionalProperties: false
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - interrupt-controller
> +  - '#interrupt-cells'
> +  - gpio-controller
> +  - '#gpio-cells'
> +
> +additionalProperties: false
> +
> +allOf:
> +  - $ref: "pinctrl.yaml#"
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +
> +    i2c0 {

Just "i2c".

> +      #address-cells = <1>;
> +      #size-cells = <0>;
> +
> +      pinctrl@20 {
> +        compatible = "cypress,cy8c9520";
> +        reg = <0x20>;
> +        gpio-controller;
> +        #gpio-cells = <2>;
> +        #interrupt-cells = <2>;
> +        interrupts = <GIC_SPI 94 IRQ_TYPE_LEVEL_HIGH>;
> +        interrupt-controller;
> +        vdd-supply = <&p3v3>;
> +        gpio-reserved-ranges = <5 1>;
> +      };
> +    };


Best regards,
Krzysztof