Re: [PATCH] serial: 8250: add option to disable registration of legacy ISA ports

On Sun, Jan 31, 2021 at 09:25:33PM +0200, Andy Shevchenko wrote:

On Thursday, January 28, 2021, Mans Rullgard [off-list ref] wrote:

quoted

On systems that do not have the traditional PC ISA serial ports, the
8250 driver still creates non-functional device nodes.  This change
makes only ports that actually exist (PCI, DT, ...) get device nodes.

This is kinda ABI breakage. At least this will break x86 platforms with
HSUARTs (all modern ones) that are used in embedded systems.

I think you would rather need an option to disable this and select it by
the platforms where it is known not to break anything.

This option is behind CONFIG_EXPERT, if you set it, you know what you
are doing, so that's fine.

thanks,

greg k-h