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Date: Wed, 19 Aug 2026 07:57:57 +0200
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Lucas Tanure <tanure@linux.com>
Cc: Jiri Slaby <jirislaby@kernel.org>, linux-kernel@vger.kernel.org,
	linux-serial@vger.kernel.org
Subject: Re: [PATCH] serial: 8250: don't register ports that have no hardware
Message-ID: <2026081923-magical-enlisted-64ff@gregkh>
References: <20260818185200.10243-1-tanure@linux.com>
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In-Reply-To: <20260818185200.10243-1-tanure@linux.com>

On Tue, Aug 18, 2026 at 07:52:00PM +0100, Lucas Tanure wrote:
> The 8250 driver creates a fixed set of port slots at boot and
> registers a ttyS device for each one, even when the slot describes no
> hardware. On device tree platforms those slots are empty, but they
> still take the ttyS0..ttyS3 names.
> 
> New Amlogic SoCs (S4, T7) name their real UARTs ttyS as well. With
> both drivers built in, as in arm64 defconfig, the real port fails to bind:

Then fix that bug, don't break everyone else's systems because of it.

greg k-h