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

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Message-ID: <9170a555-7cd3-4888-bad3-01b71c6f445e@ti.com>
Date: Tue, 28 May 2024 11:56:28 +0530
From: Bhavya Kapoor <b-kapoor@...com>
To: Arnd Bergmann <arnd@...db.de>, <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

Hi Arnd, our most boards have 6 uarts that can be used in the runtime

but overall our SoC has 12 uarts. And some of our customers have this

requirements that on their custom boards they use more than 8 uarts on their

boards. Thus, we need to enable this to 12 uarts.

Regards

~B-Kapoor

On 17/05/24 12:19 pm, Arnd Bergmann wrote:
> 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