linux-kernel - Re: [net-next PATCH v10 2/9] dt-bindings: net: Document support for Airoha AN8855 Switch Virtual MDIO

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Message-ID: <656c4f9d-ff6b-4c98-84f4-d20b6e562c13@lunn.ch>
Date: Sun, 8 Dec 2024 17:02:48 +0100
From: Andrew Lunn <andrew@...n.ch>
To: Christian Marangi <ansuelsmth@...il.com>
Cc: Lee Jones <lee@...nel.org>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Vladimir Oltean <olteanv@...il.com>,
	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Russell King <linux@...linux.org.uk>,
	Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org, netdev@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	upstream@...oha.com
Subject: Re: [net-next PATCH v10 2/9] dt-bindings: net: Document support for
 Airoha AN8855 Switch Virtual MDIO

On Sun, Dec 08, 2024 at 01:20:37AM +0100, Christian Marangi wrote:
> Document support for Airoha AN8855 Virtual MDIO Passtrough. This is needed
> as AN8855 require special handling as the same address on the MDIO bus is
> shared for both Switch and PHY and special handling for the page
> configuration is needed to switch accessing to Switch address space
> or PHY.
> 
> Signed-off-by: Christian Marangi <ansuelsmth@...il.com>
> ---
>  .../bindings/net/airoha,an8855-mdio.yaml      | 86 +++++++++++++++++++
>  MAINTAINERS                                   |  1 +
>  2 files changed, 87 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/net/airoha,an8855-mdio.yaml
> 
> diff --git a/Documentation/devicetree/bindings/net/airoha,an8855-mdio.yaml b/Documentation/devicetree/bindings/net/airoha,an8855-mdio.yaml
> new file mode 100644
> index 000000000000..2211df3cc3b7
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/net/airoha,an8855-mdio.yaml
> @@ -0,0 +1,86 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/net/airoha,an8855-mdio.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Airoha AN8855 MDIO Passtrough
> +
> +maintainers:
> +  - Christian Marangi <ansuelsmth@...il.com>
> +
> +description:
> +  Airoha AN8855 Virtual MDIO Passtrough. This is needed as AN8855
> +  require special handling as the same address on the MDIO bus is
> +  shared for both Switch and PHY and special handling for the page
> +  configuration is needed to switch accessing to Switch address space
> +  or PHY.
> +
> +$ref: /schemas/net/mdio.yaml#
> +
> +properties:
> +  compatible:
> +    const: airoha,an8855-mdio
> +
> +required:
> +  - compatible
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    mdio {
> +        compatible = "airoha,an8855-mdio";
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        internal_phy1: phy@1 {
> +            reg = <1>;
> +
> +            nvmem-cells = <&shift_sel_port0_tx_a>,
> +                <&shift_sel_port0_tx_b>,
> +                <&shift_sel_port0_tx_c>,
> +                <&shift_sel_port0_tx_d>;
> +            nvmem-cell-names = "tx_a", "tx_b", "tx_c", "tx_d";


For this example nvmem is not relevant. Those are PHY properties, not
MDIO properties. So you could simplify this.

	Andrew