Re: [PATCH] serial: 8250: don't register ports that have no hardware

[Lucas Tanure <tanure@linux.com>]

On 19/08/2026 06:57, Greg Kroah-Hartman wrote:
> 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.
> 
Hi,

Understood. I thought preventing 8250 from probing on devices that don't 
use it would be a good idea, and fix my bug. Thanks for the feedback.

I will tak to Amlogic list the ttyS name collision introduced for the 
new Amlogic SoCs in e71aab9d6132.

Thanks,
Lucas
> greg k-h