linux-kernel - Re: [PATCH 2/3] dt-bindings: pinctrl: Add cix,sky1-pinctrl

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Message-ID: <0fa7e2cb-fa0b-4f9e-84d6-a4b2b3d8a4cf@kernel.org>
Date: Wed, 27 Aug 2025 10:22:35 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Gary Yang <gary.yang@...tech.com>, linus.walleij@...aro.org,
 robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org
Cc: linux-gpio@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, cix-kernel-upstream@...tech.com
Subject: Re: [PATCH 2/3] dt-bindings: pinctrl: Add cix,sky1-pinctrl

On 27/08/2025 04:42, Gary Yang wrote:
> Add dt-bindings docs

For what? Describe the hardware here in one, two sentences.

> 
> Signed-off-by: Gary Yang <gary.yang@...tech.com>
> ---
>  .../bindings/pinctrl/cix,sky1-pinctrl.yaml    |  77 +++
>  include/dt-bindings/pinctrl/pads-sky1.h       | 592 ++++++++++++++++++
>  2 files changed, 669 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/pinctrl/cix,sky1-pinctrl.yaml
>  create mode 100644 include/dt-bindings/pinctrl/pads-sky1.h
> 
> diff --git a/Documentation/devicetree/bindings/pinctrl/cix,sky1-pinctrl.yaml b/Documentation/devicetree/bindings/pinctrl/cix,sky1-pinctrl.yaml
> new file mode 100644
> index 000000000000..10a4a292188e
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pinctrl/cix,sky1-pinctrl.yaml
> @@ -0,0 +1,77 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/pinctrl/cix,sky1-pinctrl.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Cix Sky1 Pin Controller
> +
> +maintainers:
> +  - Gary Yang <gary.yang@...tech.com>
> +
> +description:
> +  Please refer to pinctrl-bindings.txt in this directory for common
> +  binding part and usage.

Drop description, not desired really.

> +
> +properties:
> +  compatible:
> +    enum:
> +      - cix,sky1-iomuxc
> +      - cix,sky1-iomuxc-s5

Whats the difference between? You have entire description field to
explain this but instead you said something obvious there.

> +
> +  reg:
> +    maxItems: 1
> +
> +# Client device subnode's properties
> +patternProperties:
> +  '-pins$':
> +    type: object
> +    description:
> +      Pinctrl node's client devices use subnodes for desired pin configuration.
> +      Client device subnodes use below standard properties.
> +
> +    properties:
> +      cix,pins:

No, use generic properties from pinmux schema.

You should also reference it.

> +        description:
> +          each entry consists of 3 integers and represents the mux and config
> +          setting for one pin. The first 2 integers <mux_reg func_num> are
> +          specified using a CIX_PAD_* macro.The last integer CONFIG is the pad
> +          setting value like pull-up on this pin.
> +        $ref: /schemas/types.yaml#/definitions/uint32-matrix
> +        items:
> +          items:
> +            - description: |
> +                "mux_reg" indicates the offset of register.
> +            - description: |
> +                "func_num" indicates the mux value to be applied.
> +            - description: |
> +                "pad_setting" indicates the pad configuration value to be
> +                applied.
> +
> +    required:
> +      - cix,pins
> +
> +    additionalProperties: false
> +
> +required:
> +  - compatible
> +  - reg
> +
> +allOf:
> +  - $ref: pinctrl.yaml#
> +
> +additionalProperties: false
> +
> +examples:
> +  # Pinmux controller node
> +  - |
> +    #include <dt-bindings/pinctrl/pads-sky1.h>
> +    iomuxc: pinctrl@...0000 {
> +        compatible = "cix,sky1-iomuxc";
> +        reg = <0x4170000 0x1000>;
> +
> +        pinctrl_hog: hog-pins {

Don't use hog.

> +            cix,pins =
> +                <CIX_PAD_GPIO144_FUNC_GPIO144 (PULL_DOWN|DS_LEVEL4)>;
> +        };
> +    };
> diff --git a/include/dt-bindings/pinctrl/pads-sky1.h b/include/dt-bindings/pinctrl/pads-sky1.h
> new file mode 100644
> index 000000000000..44550e4105b3
> --- /dev/null
> +++ b/include/dt-bindings/pinctrl/pads-sky1.h

Bindings follow compatible naming. See writing bindings.

> @@ -0,0 +1,592 @@
> +/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) */
> +/*
> + * Copyright 2024-2025 Cix Technology Group Co., Ltd.
> + */
> +
> +#ifndef __SKY1_PADS_H
> +#define __SKY1_PADS_H
> +
> +#define CIX_PAD_GPIO001_OFFSET			0x0
> +#define CIX_PAD_GPIO002_OFFSET			0x4

Not bindings. Drop all this.



Best regards,
Krzysztof