Re: [PATCH 05/13] dt-bindings: i2c: add bindings for microchip mpfs i2c

[Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>]

On 08/11/2021 16:05, conor.dooley@microchip.com wrote:
> From: Conor Dooley <conor.dooley@microchip.com>
> 
> Add device tree bindings for the i2c controller on
> the Microchip PolarFire SoC.
> 
> Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
> Signed-off-by: Daire McNamara <daire.mcnamara@microchip.com>
> ---
>  .../bindings/i2c/microchip,mpfs-i2c.yaml      | 74 +++++++++++++++++++
>  1 file changed, 74 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/i2c/microchip,mpfs-i2c.yaml
> 
> diff --git a/Documentation/devicetree/bindings/i2c/microchip,mpfs-i2c.yaml b/Documentation/devicetree/bindings/i2c/microchip,mpfs-i2c.yaml
> new file mode 100644
> index 000000000000..bc4ea4498d35
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/i2c/microchip,mpfs-i2c.yaml
> @@ -0,0 +1,74 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/i2c/microchip,mpfs-i2c.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Microchip MPFS I2C Controller Device Tree Bindings
> +
> +maintainers:
> +  - Daire McNamara <daire.mcnamara@microchip.com>
> +
> +description: |
> +  This I2C controller is found on the Microchip PolarFire SoC.
> +
> +allOf:
> +  - $ref: /schemas/i2c/i2c-controller.yaml#
> +
> +properties:
> +  compatible:
> +    enum:
> +      - microchip,mpfs-i2c # Microchip PolarFire SoC compatible SoCs
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  clocks:
> +    description: Phandle of the clock feeding the I2C controller.

Skip such descriptions here and in other patches - they do not introduce
any meaningful information.

> +    minItems: 1

Define instead exact number of clocks or maxItems... but why would they
be variable?

> +
> +  clock-frequency:
> +    description: |
> +      Desired I2C bus clock frequency in Hz. As only Standard and Fast
> +      modes are supported, possible values are 100000 and 400000.
> +    enum: [100000, 400000]
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - clocks
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/microchip,mpfs-clock.h>
> +    soc {
> +        #address-cells = <2>;
> +        #size-cells = <2>;
> +        i2c@2010a000 {
> +            compatible = "microchip,mpfs-i2c";
> +            reg = <0 0x2010a000 0 0x1000>;
> +            interrupts = <58>;
> +            clock-frequency = <100000>;
> +            clocks = <&clkcfg CLK_I2C0>;
> +        };
> +    };
> +  - |
> +    #include <dt-bindings/clock/microchip,mpfs-clock.h>
> +    soc {
> +        #address-cells = <2>;
> +        #size-cells = <2>;
> +        i2c@2010b000 {
> +            compatible = "microchip,mpfs-i2c";
> +            reg = <0 0x2010b000 0 0x1000>;
> +            interrupts = <61>;
> +            clock-frequency = <100000>;
> +            clocks = <&clkcfg CLK_I2C1>;

This is the same example as above, just with changed numbers. Skip it.

> +        };
> +    };
> +...
> 


Best regards,
Krzysztof