Re: [PATCH v4] serial: 8250_bcm7271: improve bcm7271 8250 port

[Andy Shevchenko <andriy.shevchenko@linux.intel.com>]

On Mon, Aug 21, 2023 at 11:52:51AM -0700, Justin Chen wrote:
> The 8250 BCM7271 UART is not a direct match to PORT_16550A and other
> generic ports do not match its hardware capabilities. PORT_ALTR matches
> the rx trigger levels, but its vendor configurations are not compatible.
> Unfortunately this means we need to create another port to fully capture
> the hardware capabilities of the BCM7271 UART.
> 
> To alleviate some latency pressures, we default the rx trigger level to 8.

FWIW,
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

...

> +	[PORT_BCM7271] = {
> +		.name		= "Broadcom BCM7271 UART",
> +		.fifo_size	= 32,
> +		.tx_loadsz	= 32,
> +		.fcr		= UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_01,
> +		.rxtrig_bytes	= {1, 8, 16, 30},
> +		.flags		= UART_CAP_FIFO | UART_CAP_AFE,
> +	},

Strictly speaking it's better to keep this ordered according to the number, but
it's fine like this anyway.

-- 
With Best Regards,
Andy Shevchenko