* [PATCH] serial: 8250: Add Armada 38x earlycon support
@ 2026-09-02 22:17 Rosen Penev
2026-09-23 12:22 ` Greg Kroah-Hartman
0 siblings, 1 reply; 3+ messages in thread
From: Rosen Penev @ 2026-09-02 22:17 UTC (permalink / raw)
To: linux-serial
Cc: Greg Kroah-Hartman, Jiri Slaby, open list:TTY LAYER AND SERIAL DRIVERS
Register the Armada 38x UART compatible with the built-in 8250
earlycon implementation so stdout-path can enable an early console
without adding a generic ns16550a compatible to the device tree.
Keeping the vendor-specific compatible avoids exposing the UART to the
generic OF 8250 runtime driver while preserving the DesignWare driver
Armada-specific runtime handling.
Assisted-by: Codex:GPT-5
Signed-off-by: Rosen Penev <rosenp@gmail.com>
---
drivers/tty/serial/8250/8250_early.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/tty/serial/8250/8250_early.c b/drivers/tty/serial/8250/8250_early.c
index 44ec209f37c4..265d49850e15 100644
--- a/drivers/tty/serial/8250/8250_early.c
+++ b/drivers/tty/serial/8250/8250_early.c
@@ -175,6 +175,7 @@ EARLYCON_DECLARE(uart8250, early_serial8250_setup);
EARLYCON_DECLARE(uart, early_serial8250_setup);
OF_EARLYCON_DECLARE(ns16550, "ns16550", early_serial8250_setup);
OF_EARLYCON_DECLARE(ns16550a, "ns16550a", early_serial8250_setup);
+OF_EARLYCON_DECLARE(uart, "marvell,armada-38x-uart", early_serial8250_setup);
OF_EARLYCON_DECLARE(uart, "nvidia,tegra20-uart", early_serial8250_setup);
OF_EARLYCON_DECLARE(uart, "snps,dw-apb-uart", early_serial8250_setup);
--
2.55.0
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] serial: 8250: Add Armada 38x earlycon support
2026-09-02 22:17 [PATCH] serial: 8250: Add Armada 38x earlycon support Rosen Penev
@ 2026-09-23 12:22 ` Greg Kroah-Hartman
2026-09-23 18:33 ` Rosen Penev
0 siblings, 1 reply; 3+ messages in thread
From: Greg Kroah-Hartman @ 2026-09-23 12:22 UTC (permalink / raw)
To: Rosen Penev
Cc: linux-serial, Jiri Slaby, open list:TTY LAYER AND SERIAL DRIVERS
On Wed, Sep 02, 2026 at 03:17:09PM -0700, Rosen Penev wrote:
> Register the Armada 38x UART compatible with the built-in 8250
> earlycon implementation so stdout-path can enable an early console
> without adding a generic ns16550a compatible to the device tree.
>
> Keeping the vendor-specific compatible avoids exposing the UART to the
> generic OF 8250 runtime driver while preserving the DesignWare driver
> Armada-specific runtime handling.
>
> Assisted-by: Codex:GPT-5
> Signed-off-by: Rosen Penev <rosenp@gmail.com>
> ---
> drivers/tty/serial/8250/8250_early.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/drivers/tty/serial/8250/8250_early.c b/drivers/tty/serial/8250/8250_early.c
> index 44ec209f37c4..265d49850e15 100644
> --- a/drivers/tty/serial/8250/8250_early.c
> +++ b/drivers/tty/serial/8250/8250_early.c
> @@ -175,6 +175,7 @@ EARLYCON_DECLARE(uart8250, early_serial8250_setup);
> EARLYCON_DECLARE(uart, early_serial8250_setup);
> OF_EARLYCON_DECLARE(ns16550, "ns16550", early_serial8250_setup);
> OF_EARLYCON_DECLARE(ns16550a, "ns16550a", early_serial8250_setup);
> +OF_EARLYCON_DECLARE(uart, "marvell,armada-38x-uart", early_serial8250_setup);
> OF_EARLYCON_DECLARE(uart, "nvidia,tegra20-uart", early_serial8250_setup);
> OF_EARLYCON_DECLARE(uart, "snps,dw-apb-uart", early_serial8250_setup);
>
> --
> 2.55.0
>
How was this tested?
thanks,
greg k-h
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] serial: 8250: Add Armada 38x earlycon support
2026-09-23 12:22 ` Greg Kroah-Hartman
@ 2026-09-23 18:33 ` Rosen Penev
0 siblings, 0 replies; 3+ messages in thread
From: Rosen Penev @ 2026-09-23 18:33 UTC (permalink / raw)
To: Greg Kroah-Hartman
Cc: linux-serial, Jiri Slaby, open list:TTY LAYER AND SERIAL DRIVERS
On Wed, Sep 23, 2026 at 5:22 AM Greg Kroah-Hartman
<gregkh@linuxfoundation.org> wrote:
>
> On Wed, Sep 02, 2026 at 03:17:09PM -0700, Rosen Penev wrote:
> > Register the Armada 38x UART compatible with the built-in 8250
> > earlycon implementation so stdout-path can enable an early console
> > without adding a generic ns16550a compatible to the device tree.
> >
> > Keeping the vendor-specific compatible avoids exposing the UART to the
> > generic OF 8250 runtime driver while preserving the DesignWare driver
> > Armada-specific runtime handling.
> >
> > Assisted-by: Codex:GPT-5
> > Signed-off-by: Rosen Penev <rosenp@gmail.com>
> > ---
> > drivers/tty/serial/8250/8250_early.c | 1 +
> > 1 file changed, 1 insertion(+)
> >
> > diff --git a/drivers/tty/serial/8250/8250_early.c b/drivers/tty/serial/8250/8250_early.c
> > index 44ec209f37c4..265d49850e15 100644
> > --- a/drivers/tty/serial/8250/8250_early.c
> > +++ b/drivers/tty/serial/8250/8250_early.c
> > @@ -175,6 +175,7 @@ EARLYCON_DECLARE(uart8250, early_serial8250_setup);
> > EARLYCON_DECLARE(uart, early_serial8250_setup);
> > OF_EARLYCON_DECLARE(ns16550, "ns16550", early_serial8250_setup);
> > OF_EARLYCON_DECLARE(ns16550a, "ns16550a", early_serial8250_setup);
> > +OF_EARLYCON_DECLARE(uart, "marvell,armada-38x-uart", early_serial8250_setup);
> > OF_EARLYCON_DECLARE(uart, "nvidia,tegra20-uart", early_serial8250_setup);
> > OF_EARLYCON_DECLARE(uart, "snps,dw-apb-uart", early_serial8250_setup);
> >
> > --
> > 2.55.0
> >
>
> How was this tested?
This is actually a bugfix to avoid having to add "ns16550a" in dts,
which arose from a dt bindings commit asking why "ns16550a" is even
needed.
Anyway, the actual earlycon functionality was probably tested on a
Turris Omnia given the author of 62480772263a
>
> thanks,
>
> greg k-h
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2026-09-23 18:33 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2026-09-02 22:17 [PATCH] serial: 8250: Add Armada 38x earlycon support Rosen Penev
2026-09-23 12:22 ` Greg Kroah-Hartman
2026-09-23 18:33 ` Rosen Penev
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