linux-kernel - Re: [PATCH 3/3] arm64: dts: marvell: espressobin-ultra: fix Ethernet Switch unit address

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Date: Tue, 2 Apr 2024 21:27:00 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Krzysztof Kozlowski <krzk@...nel.org>
Cc: Robert Marko <robert.marko@...tura.hr>,
	Gregory Clement <gregory.clement@...tlin.com>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] arm64: dts: marvell: espressobin-ultra: fix Ethernet
 Switch unit address

On Tue, Apr 02, 2024 at 08:32:40PM +0200, Krzysztof Kozlowski wrote:
> The Espressobin Ultra DTS includes Espressobin DTSI which defines
> ethernet-switch@1 node.  The Ultra DTS overrides "reg" to 3, but that
> leaves still old unit address which conflicts with the new phy@1 node
> (W=1 dtc warning):
> 
>   armada-3720-espressobin.dtsi:148.29-203.4: Warning (unique_unit_address_if_enabled): /soc/internal-regs@...00000/mdio@...04/ethernet-switch@1: duplicate unit-address (also used in node /soc/internal-regs@...00000/mdio@...04/ethernet-phy@1)
> 
> Fix this by deleting ethernet-switch@1 node and merging original node
> with code from Ultra DTS into new ethernet-switch@3.

That is a bit ugly, having the exact same code twice.

Could the bulk of the switch node be put into a .dtsi file, and then
included as needed

&mdio {
        switch0: ethernet-switch@1 {
		reg = <1>;        
		include "armada-3720-espressobin-switch.dtsi"

        }
}

&mdio {
        switch0: ethernet-switch@3 {
		reg = <3>;        
		include "armada-3720-espressobin-switch.dtsi"

        }
}

	Andrew