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arm64: defconfig: Increase SERIAL_8250_NR_UARTS 

JIRA: https://issues.redhat.com/browse/RHEL-24205

commit 7bb7d31d9e454fc0b13cb0df44c2b4d953b4a152
Author: Francesco Dolcini <francesco@dolcini.it>
Date:   Fri Dec 1 20:57:32 2023 +0100

    arm64: defconfig: Increase SERIAL_8250_NR_UARTS

    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").

    The need to increase this value was noticed while working with Toradex
    Verdin AM62, this board has 4 serial UART instances available to the user
    plus an internal one that is connected to a Bluetooth module. Without this
    change the fifth UART connected to the BT module is not instantiated and BT
    is not working.

    Instead of increasing the number to the bare minimum (5) that would be
    required to solve this specific issue, we increase this to 8 which seems a
    more reasonable number to have in the defconfig and should cover more valid
    use cases.

    With this change the kernel image size increases by ~3.2kB. bloat-o-meter
    summary: add/remove: 1/1 grow/shrink: 7/0 up/down: 3220/-8 (3212)

    Cc: Tony Lindgren <tony@atomide.com>
    Reviewed-by: Tony Lindgren <tony@atomide.com>
    Signed-off-by: Francesco Dolcini <francesco@dolcini.it>
    Link: https://lore.kernel.org/r/20231201195732.4931-1-francesco@dolcini.it
    Signed-off-by: Nishanth Menon <nm@ti.com>

Signed-off-by: Andrew Halaney <ahalaney@redhat.com>
This commit is contained in:
Andrew Halaney 2024-02-27 15:42:13 -06:00 committed by Derek Barbosa
parent c7f4e6fad2
commit 030f3d8b8f
1 changed files with 1 additions and 0 deletions
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arch/arm64/configs/defconfig
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@ -405,6 +405,7 @@ CONFIG_SERIO_AMBAKMI=y
CONFIG_LEGACY_PTY_COUNT=16
CONFIG_SERIAL_8250=y
CONFIG_SERIAL_8250_CONSOLE=y
CONFIG_SERIAL_8250_NR_UARTS=8
CONFIG_SERIAL_8250_EXTENDED=y
CONFIG_SERIAL_8250_SHARE_IRQ=y
CONFIG_SERIAL_8250_BCM2835AUX=y