dt-bindings: i2c: Add yaml for Spreadtrum I2C controller

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

Change in V2
-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@unisoc.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

On Fri, 03 Nov 2023 17:16:53 +0800, 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
> controller, information related to the 'reset' attribute has been
> added to the bindings file.
> 
> Change in V2
> -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@unisoc.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
> 

My bot found errors running 'make DT_CHECKER_FLAGS=-m dt_binding_check'
on your patch (DT_CHECKER_FLAGS is new in v5.13):

yamllint warnings/errors:

dtschema/dtc warnings/errors:
/builds/robherring/dt-review-ci/linux/Documentation/devicetree/bindings/i2c/sprd,sc9860-i2c.example.dtb: i2c@2240000: '#address-cells', '#size-cells', 'charger@63' do not match any of the regexes: 'pinctrl-[0-9]+'
	from schema $id: http://devicetree.org/schemas/i2c/sprd,sc9860-i2c.yaml#

doc reference errors (make refcheckdocs):

See https://patchwork.ozlabs.org/project/devicetree-bindings/patch/20231103091653.4591-1-Huangzheng.Lai@unisoc.com

The base for the series is generally the latest rc1. A different dependency
should be noted in *this* patch.

If you already ran 'make dt_binding_check' and didn't see the above
error(s), then make sure 'yamllint' is installed and dt-schema is up to
date:

pip3 install dtschema --upgrade

Please check and re-submit after running the above command yourself. Note
that DT_SCHEMA_FILES can be set to your schema file to speed up checking
your schema. However, it must be unset to test all examples with your schema.

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@unisoc.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@70500000 {
> -	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@gmail.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@2240000 {
> +            compatible = "sprd,sc9860-i2c";

Use 4 spaces for example indentation.

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

Best regards,
Krzysztof