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

From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
To: nick.hawkins@hpe.com, verdun@hpe.com, robh+dt@kernel.org,
	krzysztof.kozlowski+dt@linaro.org, joel@jms.id.au,
	linux@armlinux.org.uk, linux-i2c@vger.kernel.org,
	devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v3 2/5] dt-bindings: i2c: Add hpe,gxp-i2c
Date: Sun, 22 Jan 2023 15:02:50 +0100	[thread overview]
Message-ID: <d63231dd-38a7-2cf4-3433-8f28018665f6@linaro.org> (raw)
In-Reply-To: <20230120190159.23459-3-nick.hawkins@hpe.com>

On 20/01/2023 20:01, nick.hawkins@hpe.com wrote:
> From: Nick Hawkins <nick.hawkins@hpe.com>
> 
> Document compatibility string to support I2C controller
> in GXP.
> 
> Signed-off-by: Nick Hawkins <nick.hawkins@hpe.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@hpe.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