linux-kernel - Re: [PATCH v2 1/3] arm64: dts: ti: k3-j784s4-main: Add PCIe nodes

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Date: Wed, 22 May 2024 15:51:43 +0530
From: Siddharth Vadapalli <s-vadapalli@...com>
To: Francesco Dolcini <francesco@...cini.it>
CC: Siddharth Vadapalli <s-vadapalli@...com>, <nm@...com>, <vigneshr@...com>,
        <kristo@...nel.org>, <robh@...nel.org>, <krzk+dt@...nel.org>,
        <conor+dt@...nel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
        <danishanwar@...com>, <srk@...com>
Subject: Re: [PATCH v2 1/3] arm64: dts: ti: k3-j784s4-main: Add PCIe nodes

On Tue, May 21, 2024 at 10:09:09PM +0200, Francesco Dolcini wrote:
> On Mon, May 20, 2024 at 03:41:47PM +0530, Siddharth Vadapalli wrote:
> > TI's J784S4 has two instances of Gen3 x4 Lane PCIe Controllers namely
> > PCIE0 and PCIE1. Add support for the Root Complex Mode of operation of
> > these PCIe instances.
> 
> What about PCIE2? J784S4 has 3 PCIe instances, it would be beneficial to
> add all 3, not just the first twos.

Thank you for reviewing the patch. I agree that it was incorrect for me
to mention that J784S4 has two instances of PCIe. It actually has 4
instances as mentioned in the Excel Sheet provided along with the
Technical Reference Manual at:
https://www.ti.com/lit/zip/spruj52
namely PCIe0, PCIe1, PCIe2 and PCIe3.

Since the J784S4 EVM has only PCIe0 and PCIe1 instances of PCIe brought
out, I was able to test them and therefore added support for only those
two instances in this series. However I do agree that all 4 should be
added to the SoC file (k3-j784s4-main.dtsi) for the sake of completeness
in terms of describing the SoC, while the Board file (k3-j784s4-evm.dts)
can still contain just PCIe0 and PCIe1 as those are the ones brought out
on the board. I will implement your suggestion in the v3 series.

Regards,
Siddharth.