linux-kernel - Re: [PATCH] arm64: defconfig: Modify number of usable 8250 uart ports

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Message-Id: <1d1c92f3-1692-40a1-aeb9-ef3e342e9bf6@app.fastmail.com>
Date: Fri, 17 May 2024 06:49:58 +0000
From: "Arnd Bergmann" <arnd@...db.de>
To: "Bhavya Kapoor" <b-kapoor@...com>, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org
Cc: "Udit Kumar" <u-kumar1@...com>,
 Nícolas F. R. A. Prado <nfraprado@...labora.com>,
 "Marek Szyprowski" <m.szyprowski@...sung.com>,
 "Biju Das" <biju.das.jz@...renesas.com>,
 "Neil Armstrong" <neil.armstrong@...aro.org>,
 "Shawn Guo" <shawnguo@...nel.org>,
 "Konrad Dybcio" <konrad.dybcio@...aro.org>,
 "Geert Uytterhoeven" <geert+renesas@...der.be>,
 "Krzysztof Kozlowski" <krzysztof.kozlowski@...aro.org>,
 "Bjorn Andersson" <quic_bjorande@...cinc.com>,
 "Will Deacon" <will@...nel.org>, "Catalin Marinas" <catalin.marinas@....com>
Subject: Re: [PATCH] arm64: defconfig: Modify number of usable 8250 uart ports

On Thu, May 16, 2024, at 09:57, Bhavya Kapoor wrote:
> Jacinto SoCs have a total of 12 serial uart ports. But only 8 out
> of these 12 uarts can be used at a time.
>
> Thus, Modify maximum number of 8250 serial uart ports which can be
> supported as well as modify how many 8250 serial uart ports which
> we can use in the runtime to 12 for all the SoCs.
>
> Signed-off-by: Bhavya Kapoor <b-kapoor@...com>

I forget what we had already discussed here. To clarify from my
side: it's ok to raise the limit if there are any known boards that
connect more than 8 8250 style uarts to external devices or
populated connectors.

On the other hand, I don't see any dts file at the moment that
has more than the maximum of 8 in k3-am642-tqma64xxl-mbax4xxl.dts.

If you are adding another board that has more, it helps to
clarify in the patch description that this is indeed a board
requirement, and not just done because the chip has additional
unused uarts.

     Arnd