linux-kernel - Re: [PATCH v2 2/4] arm64: dts: ti: k3-am654-base-board: add ICSSG2 Ethernet support

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Message-ID: <3869499c-532d-8cd0-f428-6697bbbedd8d@ti.com>
Date:   Mon, 25 Sep 2023 08:45:16 -0500
From:   Andrew Davis <afd@...com>
To:     MD Danish Anwar <danishanwar@...com>,
        Vignesh Raghavendra <vigneshr@...com>,
        Nishanth Menon <nm@...com>
CC:     Conor Dooley <conor+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Tero Kristo <kristo@...nel.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <srk@...com>,
        <r-gunasekaran@...com>
Subject: Re: [PATCH v2 2/4] arm64: dts: ti: k3-am654-base-board: add ICSSG2
 Ethernet support

On 9/25/23 3:21 AM, MD Danish Anwar wrote:
> Hi Andrew,
> 
> On 22/09/23 09:52, MD Danish Anwar wrote:
>> On 21/09/23 22:57, Andrew Davis wrote:
>>> On 9/21/23 1:09 AM, MD Danish Anwar wrote:
>>>> ICSSG2 provides dual Gigabit Ethernet support.
>>>>
>>>> For support SR2.0 ICSSG Ethernet firmware:
>>>> - provide different firmware blobs and use TX_PRU.
>>>> - IEP0 is used as PTP Hardware Clock and can only be used for one port.
>>>> - TX timestamp notification comes via INTC interrupt.
>>>>
>>>> Signed-off-by: MD Danish Anwar <danishanwar@...com>
>>>> ---
>>>>    arch/arm64/boot/dts/ti/Makefile               |   4 +-
>>>>    ...se-board.dts => k3-am654-common-board.dts} |   0
>>>>    arch/arm64/boot/dts/ti/k3-am654-icssg2.dtso   | 145 ++++++++++++++++++
>>>>    3 files changed, 148 insertions(+), 1 deletion(-)
>>>>    rename arch/arm64/boot/dts/ti/{k3-am654-base-board.dts =>
>>>> k3-am654-common-board.dts} (100%)
>>>>    create mode 100644 arch/arm64/boot/dts/ti/k3-am654-icssg2.dtso
>>>>
>>>> diff --git a/arch/arm64/boot/dts/ti/Makefile
>>>> b/arch/arm64/boot/dts/ti/Makefile
>>>> index e7b8e2e7f083..85c91f5e832e 100644
>>>> --- a/arch/arm64/boot/dts/ti/Makefile
>>>> +++ b/arch/arm64/boot/dts/ti/Makefile
>>>> @@ -42,12 +42,14 @@ dtb-$(CONFIG_ARCH_K3) +=
>>>> k3-am642-tqma64xxl-mbax4xxl-sdcard.dtb
>>>>    dtb-$(CONFIG_ARCH_K3) += k3-am642-tqma64xxl-mbax4xxl-wlan.dtb
>>>>      # Boards with AM65x SoC
>>>> -k3-am654-gp-evm-dtbs := k3-am654-base-board.dtb
>>>> k3-am654-base-board-rocktech-rk101-panel.dtbo
>>>> +k3-am654-gp-evm-dtbs := k3-am654-common-board.dtb
>>>> k3-am654-base-board-rocktech-rk101-panel.dtbo
>>>
>>> Should the k3-am654-gp-evm.dtb not also have this icssg2 support? Does
>>> it work
>>> to keep this line like before or is there some conflict having both
>>> enabled?
>>>
>>
>> I have not tested this dtb (k3-am654-gp-evm.dtb). So just to be on the
>> safe side I kept gp-evm.dtb as it was. Ideally gp-evm.dtb should have
>> icssg2 support as well. But I haven't tested the combination of
>> base-board + icssg dtbo + rockteck dtbo. That is why I kept gp-evm dtb
>> as it was. Anyways, for ICSSG2's use case only k3-am654-base-board.dtb
>> is used so I think it's ok to leave k3-am654-gp-evm.dtb to as it was.
>>
>>> Andrew
>>>
> 
> I tested AM654x-GP EVM with k3-am654-gp-evm.dtb with both the
> combination below (having k3-am654-base-board-dtbs :=
> k3-am654-common-board.dtb k3-am654-icssg2.dtbo), ICSSG worked fine in
> both the scenarios and I didn't see any issue. I don't have a rocktech
> panel with me so couldn't test that. But as far as ICSSG is concerned it
> works fine with the both the combinations. Please let me know which one
> should I use. Should I keep gp-evm as it is (use dtb without the icssg2
> overlay) or should I add icssg2 overlay in gp-evm.dtb as well.
> 
> 
> 1. k3-am654-gp-evm-dtbs := k3-am654-base-board.dtb
> k3-am654-base-board-rocktech-rk101-panel.dtbo
> 
> 
> 2. k3-am654-gp-evm-dtbs := k3-am654-common-board.dtb
> k3-am654-base-board-rocktech-rk101-panel.dtbo
> 

As you said here before, most will expect the icssg2 to work
on the EVM out of box, you should include it. If anyone wants
something else they can apply the set of overlays that match
on their own.

So, use base-board.

Andrew