linux-kernel - Re: [PATCH v3 4/4] arm64: dts: ti: Add support for J784S4 EVM board

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Date:   Tue, 22 Nov 2022 09:51:12 +0200
From:   Tony Lindgren <tony@...mide.com>
To:     Andrew Davis <afd@...com>
Cc:     Nishanth Menon <nm@...com>, Apurva Nandan <a-nandan@...com>,
        Vignesh Raghavendra <vigneshr@...com>,
        Tero Kristo <kristo@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
        Hari Nagalla <hnagalla@...com>
Subject: Re: [PATCH v3 4/4] arm64: dts: ti: Add support for J784S4 EVM board

* Andrew Davis <afd@...com> [221118 21:05]:
> Why do we need SERIAL_8250_NR_UARTS at all, might be a better question.
> These should be dynamically allocated if the number goes over the
> default count imposed by the TTY framework. Maybe folks are still a
> bit too afraid to touch the TTY subsystem core, I don't blame them..

The 8250 core preallocates a number of ports for use, see
serial8250_isa_init_ports() and serial8250_register_8250_port(). As the
serial port driver probes, the preallocated ports get re-assigned to
the port driver.

Maybe we could keep the static serial8250_ports[] and add those ports
to a list where also the dynamically allocated ports would go..

Regards,

Tony