linux-kernel - Re: [PATCH] arm64: defconfig: increase SERIAL_8250_NR

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Date:   Fri, 1 Dec 2023 08:03:46 +0200
From:   Tony Lindgren <tony@...mide.com>
To:     Francesco Dolcini <francesco@...cini.it>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Arnd Bergmann <arnd@...db.de>, Nishanth Menon <nm@...com>,
        Vignesh Raghavendra <vigneshr@...com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Tero Kristo <kristo@...nel.org>
Subject: Re: [PATCH] arm64: defconfig: increase SERIAL_8250_NR_UARTS

* Francesco Dolcini <francesco@...cini.it> [231130 23:17]:
> Increase CONFIG_SERIAL_8250_NR_UARTS from 4 to 8, the current legacy value
> is not adequate for embedded systems that use SoCs where it's common to
> have a large number of serial ports.
> 
> No need to change CONFIG_SERIAL_8250_RUNTIME_UARTS, see commit 9d86719f8769
> ("serial: 8250: Allow using ports higher than SERIAL_8250_RUNTIME_UARTS").
> 
> This enables using the UART connected Bluetooth device on Verdin AM62
> board.

OK makes sense for distro use.

Disabling unused ports leads into port names shifting, which we still can't
easily tolerate until we have the DEVNAME:0.0 style addressing available for
ports. So for now we still depend CONFIG_SERIAL_8250_NR_UARTS, eventually
that too should become just a legacy ISA port array.. Meanwhile:

Reviewed-by: Tony Lindgren <tony@...mide.com>