linux-kernel - Re: [PATCH 1/5] dt-bindings: net: qca,ar803x: Add IPQ5018 Internal GE PHY support

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Message-ID: <061032a4-5774-482e-ba2e-96c3c81c0e3a@oss.qualcomm.com>
Date: Tue, 27 May 2025 15:15:50 +0200
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Andrew Lunn <andrew@...n.ch>,
        George Moussalem <george.moussalem@...look.com>
Cc: Konrad Dybcio <konrad.dybcio@....qualcomm.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Heiner Kallweit
 <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd
 <sboyd@...nel.org>, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org
Subject: Re: [PATCH 1/5] dt-bindings: net: qca,ar803x: Add IPQ5018 Internal GE
 PHY support

On 5/27/25 3:08 PM, Andrew Lunn wrote:
>>>>>>> Would qcom,phy-to-phy-dac (boolean) do?
>>>>>>
>>>>>> Seems fine to me.
>>>>>
>>>>> Can the driver instead check for a phy reference?
>>>>
>>>> Do you mean using the existing phy-handle DT property or create a new DT property called 'qcom,phy-reference'? Either way, can add it for v2.
>>>
>>> I'm not sure how this is all wired up. Do you have an example of a DT
>>> with both configurations you described in your reply to Andrew?
> 
> When a SoC interface is connected to a switch, the SoC interface has
> no real knowledge it is actually connected to a switch. All it knows
> is it has a link peer, and it does not know if that peer is 1cm away
> or 100m. It does nothing different.
> 
> The switch has a phandle to the SoC interface, so it knows a bit more,
> but it would be a bit around about for the SoC interface to search the
> whole device tree to see if there is a switch with a phandle pointing
> to it. So for me, a bool property indicating a short 'cable' is the
> better solution.

OK

does this sound like a generic enough problem to contemplate something
common, or should we go with something like qcom,dac-preset-short-cable

Konrad