linux-kernel - Re: [PATCH v3 2/5] dt-bindings: i2c: Add hpe,gxp-i2c

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Date:   Sun, 22 Jan 2023 15:02:50 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     nick.hawkins@....com, verdun@....com, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, joel@....id.au,
        linux@...linux.org.uk, linux-i2c@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3 2/5] dt-bindings: i2c: Add hpe,gxp-i2c

On 20/01/2023 20:01, nick.hawkins@....com wrote:
> From: Nick Hawkins <nick.hawkins@....com>
> 
> Document compatibility string to support I2C controller
> in GXP.
> 
> Signed-off-by: Nick Hawkins <nick.hawkins@....com>
> 
> ---
> 
> v3:
>  *Provide better description with use of Phandle
> v2:
>  *Removed uneccessary size-cells and address-cells
>  *Removed phandle from hpe,sysreg-phandle
>  *Changed hpe,i2c-max-bus-freq to clock-frequency
> ---
>  .../devicetree/bindings/i2c/hpe,gxp-i2c.yaml  | 57 +++++++++++++++++++
>  1 file changed, 57 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/i2c/hpe,gxp-i2c.yaml
> 
> diff --git a/Documentation/devicetree/bindings/i2c/hpe,gxp-i2c.yaml b/Documentation/devicetree/bindings/i2c/hpe,gxp-i2c.yaml
> new file mode 100644
> index 000000000000..63bc69e92d0e
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/i2c/hpe,gxp-i2c.yaml
> @@ -0,0 +1,57 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/i2c/hpe,gxp-i2c.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: HPE GXP SoC I2C Controller
> +
> +maintainers:
> +  - Nick Hawkins <nick.hawkins@....com>
> +
> +allOf:
> +  - $ref: /schemas/i2c/i2c-controller.yaml#
> +
> +properties:
> +  compatible:
> +    const: hpe,gxp-i2c
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  reg:
> +    maxItems: 1
> +
> +  clock-frequency:
> +    default: 100000
> +
> +  hpe,sysreg:
> +    $ref: /schemas/types.yaml#/definitions/phandle
> +    description:
> +      Phandle to a global status and enable registers shared
> +      between each I2C controller instance. Each bit of the
> +      registers represents an individual I2C engine.

But what is the purpose? What is it doing? Why I2C controller needs it?

> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts

Keep the same order as in properties:


Best regards,
Krzysztof