linux-kernel - Re: [PATCH v2] arm64: dts: ti: k3-am654-icssg2: Enable PHY interrupts for ICSSG2

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Date:   Thu, 14 Dec 2023 19:20:32 +0530
From:   Siddharth Vadapalli <s-vadapalli@...com>
To:     Nishanth Menon <nm@...com>
CC:     <vigneshr@...com>, <kristo@...nel.org>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <conor+dt@...nel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <danishanwar@...com>,
        <r-gunasekaran@...com>, <srk@...com>, <s-vadapalli@...com>
Subject: Re: [PATCH v2] arm64: dts: ti: k3-am654-icssg2: Enable PHY interrupts
 for ICSSG2



On 14-12-2023 17:47, Nishanth Menon wrote:

...

>>
>> Yes, you are right! Edge-Triggered interrupts shouldn't be shared. I missed
>> noticing this. Thank you for pointing it out. Since the SoC only supports
>> Edge-Triggered interrupts, I believe that the correct decision would be to use
>> the interrupt for only one of the two PHYs, while leaving the other PHY in
>> polled mode of operation which is the default.
>>
>> Kindly let me know if this is acceptable and I shall update this patch accordingly.
> 
> Sounds like a bug in board design there (due to an choice of IP
> limitation) - I suggest getting it noted in board documentation and
> refer to the errata in the second phy (else folks will wonder why we
> aren't using interrupts on the second phy.

Thank you for your suggestion on the next steps to be taken. I will
ensure that the board documentation is updated. Additionally, in the v3
patch I will add a comment within the "icssg2_phy0" node indicating that
the interrupt mode of operation is only being enabled for "icssg2_phy0"
due to the interrupt being an edge-triggered interrupt which cannot be
shared among both the PHYs. And for that reason "icssg2_phy1" is being
left in the default polled mode of operation.

-- 
Regards,
Siddharth.