Re: [PATCH 1/1] tty: serial: handle HAS_IOPORT dependencies

[Guenter Roeck]

On Fri, Apr 05, 2024 at 05:29:24PM +0200, Niklas Schnelle wrote:
> In a future patch HAS_IOPORT=n will disable inb()/outb() and friends at
> compile time. We thus need to add HAS_IOPORT as dependency for those
> drivers using them unconditionally. For 8250 based drivers some support
> MMIO only use so fence only the parts requiring I/O ports.
> 
> Co-developed-by: Arnd Bergmann <arnd@xxxxxxxxxx>
> Signed-off-by: Arnd Bergmann <arnd@xxxxxxxxxx>
> Signed-off-by: Niklas Schnelle <schnelle@xxxxxxxxxxxxx>
...
> @@ -422,10 +443,12 @@ static void set_io_from_upio(struct uart_port *p)
>  	up->dl_write = default_serial_dl_write;
>  
> +	default:
> +		WARN(1, "Unsupported UART type %x\n", p->iotype);

So, according to this patch, the serial uart on microblaze, nios2,
openrisc, xtensa, and possibly others is not or no longer supported.

WARNING: CPU: 0 PID: 0 at drivers/tty/serial/8250/8250_port.c:470 serial8250_set_defaults+0x1a8/0x22c
Unsupported UART type 0

Any special reason ?

Guenter