linux-kernel - Re: [net-next v5 1/6] dt-bindings: net: Add MTIP L2 switch description

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Message-ID: <20250415220853.GA903775-robh@kernel.org>
Date: Tue, 15 Apr 2025 17:08:53 -0500
From: Rob Herring <robh@...nel.org>
To: Lukasz Majewski <lukma@...x.de>
Cc: Andrew Lunn <andrew+netdev@...n.ch>, davem@...emloft.net,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>,
	Richard Cochran <richardcochran@...il.com>, netdev@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
	Stefan Wahren <wahrenst@....net>, Simon Horman <horms@...nel.org>
Subject: Re: [net-next v5 1/6] dt-bindings: net: Add MTIP L2 switch
 description

On Mon, Apr 14, 2025 at 04:01:23PM +0200, Lukasz Majewski wrote:
> This patch provides description of the MTIP L2 switch available in some
> NXP's SOCs - e.g. imx287.
> 
> Signed-off-by: Lukasz Majewski <lukma@...x.de>
> ---
> Changes for v2:
> - Rename the file to match exactly the compatible
>   (nxp,imx287-mtip-switch)
> 
> Changes for v3:
> - Remove '-' from const:'nxp,imx287-mtip-switch'
> - Use '^port@[12]+$' for port patternProperties
> - Drop status = "okay";
> - Provide proper indentation for 'example' binding (replace 8
>   spaces with 4 spaces)
> - Remove smsc,disable-energy-detect; property
> - Remove interrupt-parent and interrupts properties as not required
> - Remove #address-cells and #size-cells from required properties check
> - remove description from reg:
> - Add $ref: ethernet-switch.yaml#
> 
> Changes for v4:
> - Use $ref: ethernet-switch.yaml#/$defs/ethernet-ports and remove already
>   referenced properties
> - Rename file to nxp,imx28-mtip-switch.yaml
> 
> Changes for v5:
> - Provide proper description for 'ethernet-port' node
> ---
>  .../bindings/net/nxp,imx28-mtip-switch.yaml   | 141 ++++++++++++++++++
>  1 file changed, 141 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/net/nxp,imx28-mtip-switch.yaml
> 
> diff --git a/Documentation/devicetree/bindings/net/nxp,imx28-mtip-switch.yaml b/Documentation/devicetree/bindings/net/nxp,imx28-mtip-switch.yaml
> new file mode 100644
> index 000000000000..6f2b5a277ac2
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/net/nxp,imx28-mtip-switch.yaml
> @@ -0,0 +1,141 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/net/nxp,imx28-mtip-switch.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: NXP SoC Ethernet Switch Controller (L2 MoreThanIP switch)
> +
> +maintainers:
> +  - Lukasz Majewski <lukma@...x.de>
> +
> +description:
> +  The 2-port switch ethernet subsystem provides ethernet packet (L2)
> +  communication and can be configured as an ethernet switch. It provides the
> +  reduced media independent interface (RMII), the management data input
> +  output (MDIO) for physical layer device (PHY) management.
> +
> +$ref: ethernet-switch.yaml#/$defs/ethernet-ports
> +
> +properties:
> +  compatible:
> +    const: nxp,imx28-mtip-switch
> +
> +  reg:
> +    maxItems: 1
> +
> +  phy-supply:
> +    description:
> +      Regulator that powers Ethernet PHYs.
> +
> +  clocks:
> +    items:
> +      - description: Register accessing clock
> +      - description: Bus access clock
> +      - description: Output clock for external device - e.g. PHY source clock
> +      - description: IEEE1588 timer clock
> +
> +  clock-names:
> +    items:
> +      - const: ipg
> +      - const: ahb
> +      - const: enet_out
> +      - const: ptp
> +
> +  interrupts:
> +    items:
> +      - description: Switch interrupt
> +      - description: ENET0 interrupt
> +      - description: ENET1 interrupt
> +
> +  pinctrl-names: true
> +
> +  ethernet-ports:
> +    type: object
> +    additionalProperties: true
> +    properties:
> +      ethernet-port:
> +        type: object
> +        unevaluatedProperties: false

This is going to fail if you have any property other than 'reg'. But 
then it will never be applied because you never have a node called
'ethernet-port' since you have more than 1 child node. You need this 
under 'patternProperties' and 'additionalProperties: true' instead. And 
please test some of the requirements here. Like a reg value of 3 or 
remove 'phy-mode'.

> +
> +        properties:
> +          reg:
> +            items:
> +              - enum: [1, 2]
> +            description: MTIP L2 switch port number
> +
> +        required:
> +          - reg
> +          - label
> +          - phy-mode
> +          - phy-handle