Subject: Re: [PATCH v2 1/1] dt-bindings: aspeed-i2c: Convert txt to yaml format

From: Rob Herring <[email-masked]>
Date: Wed, 2 Jun 2021 15:17:20 -0500

On Thu, May 27, 2021 at 06:25:05PM +0800, Jamin Lin wrote:
> Convert aspeed i2c to yaml.
> 
> Signed-off-by: Jamin Lin <[email-masked]>
> ---
>  .../devicetree/bindings/i2c/aspeed,i2c.yaml   | 86 +++++++++++++++++++
>  .../devicetree/bindings/i2c/i2c-aspeed.txt    | 49 -----------
>  2 files changed, 86 insertions(+), 49 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/i2c/aspeed,i2c.yaml
>  delete mode 100644 Documentation/devicetree/bindings/i2c/i2c-aspeed.txt
> 
> diff --git a/Documentation/devicetree/bindings/i2c/aspeed,i2c.yaml b/Documentation/devicetree/bindings/i2c/aspeed,i2c.yaml
> new file mode 100644
> index 000000000000..1f7064d77708
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/i2c/aspeed,i2c.yaml
> @@ -0,0 +1,86 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/i2c/aspeed,i2c.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: ASPEED I2C on the AST24XX, AST25XX, and AST26XX SoCs Device Tree Bindings
> +
> +maintainers:
> +  - Rayn Chen <[email-masked]>
> +
> +allOf:
> +  - $ref: /schemas/i2c/i2c-controller.yaml#
> +
> +properties:
> +  compatible:
> +    enum:
> +      - aspeed,ast2400-i2c-bus
> +      - aspeed,ast2500-i2c-bus
> +      - aspeed,ast2600-i2c-bus
> +
> +  "#size-cells":
> +    const: 0
> +
> +  "#address-cells":
> +    const: 1

These 2 are covered by i2c-controller.yaml.

> +
> +  reg:
> +    minItems: 1
> +    maxItems: 2
> +    items:
> +      - description: address offset and range of bus
> +      - description: address offset and range of bus buffer
> +
> +  interrupts:
> +    maxItems: 1
> +    description: interrupt number

Drop. Not a useful description.

> +
> +  clocks:
> +    maxItems: 1
> +    description:
> +      root clock of bus, should reference the APB
> +      clock in the second cell
> +
> +  reset:

resets

> +    maxItems: 1
> +    description: phandle to reset controller with the reset number in
> +      the second cell

No need to describe the format of 'resets'.

> +
> +  bus-frequency:
> +    minimum: 500
> +    maximum: 4000000
> +    default: 100000
> +    description: frequency of the bus clock in Hz defaults to 100 kHz when not
> +      specified
> +
> +  multi-master:
> +    type: boolean
> +    description:
> +      states that there is another master active on this bus
> +
> +required:
> +  - reg
> +  - compatible
> +  - clocks
> +  - resets
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/aspeed-clock.h>
> +    i2c0: i2c-bus@40 {
> +      #address-cells = <1>;
> +      #size-cells = <0>;
> +      #interrupt-cells = <1>;
> +      reg = <0x40 0x40>;
> +      compatible = "aspeed,ast2500-i2c-bus";

Convention is compatible first in the list of properties.

> +      clocks = <&syscon ASPEED_CLK_APB>;
> +      resets = <&syscon ASPEED_RESET_I2C>;
> +      bus-frequency = <100000>;
> +      interrupts = <0>;
> +      interrupt-parent = <&i2c_ic>;
> +      status = "disabled";

Don't show status in examples especially when disabling disables some 
validation...

> +      /* Does not need pinctrl properties */
> +    };

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