linux-kernel - Re: [PATCH] dt-bindings: i2c: Add yaml for Spreadtrum I2C controller

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Message-ID: <a0624558-6420-479c-ba0e-c75f4e6d1b80@linaro.org>
Date:   Fri, 3 Nov 2023 12:54:20 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Huangzheng Lai <Huangzheng.Lai@...soc.com>,
        Andi Shyti <andi.shyti@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>
Cc:     Orson Zhai <orsonzhai@...il.com>,
        Baolin Wang <baolin.wang@...ux.alibaba.com>,
        Chunyan Zhang <zhang.lyra@...il.com>,
        linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org,
        huangzheng lai <laihuangzheng@...il.com>,
        Xiongpeng Wu <xiongpeng.wu@...soc.com>
Subject: Re: [PATCH] dt-bindings: i2c: Add yaml for Spreadtrum I2C controller

On 03/11/2023 10:16, Huangzheng Lai wrote:
> Add a yaml file to replace the txt file. Due to the recent addition
> of the 'reset' framework to the Spreadtrum I2C driver to reset the

Where? I don't see it. Don't mix new properties with conversion.

> controller, information related to the 'reset' attribute has been
> added to the bindings file.
> 

Mark/version your patches correctly (git format-patch -v2). Your subject
claims it is v1.

> Change in V2

Changelog goes to changelog place, so after ---.

> -Rename 'i2c-sprd.txt' to 'sprd,sc9860-i2c.yaml'.
> -Add ref to i2c-controller.
> -Drop items in 'compatible'.
> -Add describe for 'reg' items.
> -Drop 'clocks' description and just maxItems: 3.
> -Fix typo in 'clo-frequency': Contains.
> -Add explanation in commit message explaining why 'resets' be added.
> -Drop '#size-cells' and 'address-cells' in properties and required.
> -Drop description of 'resets'.
> -Add child node in examples.
> 
> Signed-off-by: Huangzheng Lai <Huangzheng.Lai@...soc.com>
> ---
>  .../devicetree/bindings/i2c/i2c-sprd.txt      | 31 --------
>  .../bindings/i2c/sprd,sc9860-i2c.yaml         | 75 +++++++++++++++++++
>  2 files changed, 75 insertions(+), 31 deletions(-)
>  delete mode 100644 Documentation/devicetree/bindings/i2c/i2c-sprd.txt
>  create mode 100644 Documentation/devicetree/bindings/i2c/sprd,sc9860-i2c.yaml
> 
> diff --git a/Documentation/devicetree/bindings/i2c/i2c-sprd.txt b/Documentation/devicetree/bindings/i2c/i2c-sprd.txt
> deleted file mode 100644
> index 7b6b3b8d0d11..000000000000
> --- a/Documentation/devicetree/bindings/i2c/i2c-sprd.txt
> +++ /dev/null
> @@ -1,31 +0,0 @@
> -I2C for Spreadtrum platforms
> -
> -Required properties:
> -- compatible: Should be "sprd,sc9860-i2c".
> -- reg: Specify the physical base address of the controller and length
> -  of memory mapped region.
> -- interrupts: Should contain I2C interrupt.
> -- clock-names: Should contain following entries:
> -  "i2c" for I2C clock,
> -  "source" for I2C source (parent) clock,
> -  "enable" for I2C module enable clock.
> -- clocks: Should contain a clock specifier for each entry in clock-names.
> -- clock-frequency: Contains desired I2C bus clock frequency in Hz.
> -- #address-cells: Should be 1 to describe address cells for I2C device address.
> -- #size-cells: Should be 0 means no size cell for I2C device address.
> -
> -Optional properties:
> -- Child nodes conforming to I2C bus binding
> -
> -Examples:
> -i2c0: i2c@...00000 {
> -	compatible = "sprd,sc9860-i2c";
> -	reg = <0 0x70500000 0 0x1000>;
> -	interrupts = <GIC_SPI 11 IRQ_TYPE_LEVEL_HIGH>;
> -	clock-names = "i2c", "source", "enable";
> -	clocks = <&clk_i2c3>, <&ext_26m>, <&clk_ap_apb_gates 11>;
> -	clock-frequency = <400000>;
> -	#address-cells = <1>;
> -	#size-cells = <0>;
> -};
> -
> diff --git a/Documentation/devicetree/bindings/i2c/sprd,sc9860-i2c.yaml b/Documentation/devicetree/bindings/i2c/sprd,sc9860-i2c.yaml
> new file mode 100644
> index 000000000000..f7dd5f116e0c
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/i2c/sprd,sc9860-i2c.yaml
> @@ -0,0 +1,75 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +# Copyright 2020 Unisoc Inc.
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/i2c/sprd,sc9860-i2c.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Unisoc I2C Controller Device
> +
> +maintainers:
> +  - Huangzheng Lai <laihuangzheng@...il.com>
> +
> +allOf:
> +  - $ref: /schemas/i2c/i2c-controller.yaml#
> +
> +properties:
> +  compatible:
> +    const: sprd,sc9860-i2c
> +
> +  reg:
> +    description: physical base address of the controller, length of memory mapped region.
> +    maxItems: 2
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  clock-names:
> +    items:
> +      - const: i2c
> +      - const: source
> +      - const: enable
> +
> +  clocks:
> +    maxItems: 3
> +
> +  clock-frequency:
> +    description: Contains desired I2C bus clock frequency in Hz.
> +    minimum: 100000
> +    maximum: 3400000
> +
> +  reset-names:
> +    const: i2c_rst

This is not a conversion. Drop the names, not really useful for one entry.

> +
> +  resets:
> +    maxItems: 1
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - clock-names
> +  - clocks
> +
> +additionalProperties: false

Still not tested.

Please test patches before sending. Due to untested code, I am not
performing full review.

> +
> +examples:
> +  - |
> +    i2c0: i2c@...0000 {
> +            compatible = "sprd,sc9860-i2c";

Use 4 spaces for example indentation.

> +            reg = <0 0x2240000 0 0x1000>;

Best regards,
Krzysztof