linux-kernel - Re: [PATCH 37/41] drivers: tty: serial: 8250: simplify io resource size computation

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Message-ID: <20190428152103.GP9224@smile.fi.intel.com>
Date:   Sun, 28 Apr 2019 18:21:03 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     "Enrico Weigelt, metux IT consult" <info@...ux.net>
Cc:     linux-kernel@...r.kernel.org, gregkh@...uxfoundation.org,
        andrew@...id.au, macro@...ux-mips.org, vz@...ia.com,
        slemieux.tyco@...il.com, khilman@...libre.com, liviu.dudau@....com,
        sudeep.holla@....com, lorenzo.pieralisi@....com,
        davem@...emloft.net, jacmet@...site.dk, linux@...sktech.co.nz,
        matthias.bgg@...il.com, linux-mips@...r.kernel.org,
        linux-serial@...r.kernel.org, linux-ia64@...r.kernel.org,
        linux-amlogic@...ts.infradead.org, linuxppc-dev@...ts.ozlabs.org,
        sparclinux@...r.kernel.org
Subject: Re: [PATCH 37/41] drivers: tty: serial: 8250: simplify io resource
 size computation

On Sat, Apr 27, 2019 at 02:52:18PM +0200, Enrico Weigelt, metux IT consult wrote:
> Simpily io resource size computation by setting mapsize field.
> 
> Some of the special cases handled by serial8250_port_size() can be
> simplified by putting this data to corresponding platform data
> or probe function.


> --- a/drivers/tty/serial/8250/8250.h
> +++ b/drivers/tty/serial/8250/8250.h
> @@ -105,6 +105,7 @@ struct serial8250_config {
>  
>  #define SERIAL8250_PORT(_base, _irq) SERIAL8250_PORT_FLAGS(_base, _irq, 0)
>  

> +#define SERIAL_RT2880_IOSIZE	0x100

And why this is in the header file and not in corresponding C one?

> diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c
> index d09af4c..51d6076 100644
> --- a/drivers/tty/serial/8250/8250_port.c
> +++ b/drivers/tty/serial/8250/8250_port.c
> @@ -2833,11 +2833,7 @@ unsigned int serial8250_port_size(struct uart_8250_port *pt)
>  {
>  	if (pt->port.mapsize)
>  		return pt->port.mapsize;
> -	if (pt->port.iotype == UPIO_AU) {
> -		if (pt->port.type == PORT_RT2880)
> -			return 0x100;
> -		return 0x1000;
> -	}
> +
>  	if (is_omap1_8250(pt))
>  		return 0x16 << pt->port.regshift;

This is good. We definitely need to get rid of custom stuff in generic
8250_port, etc.

-- 
With Best Regards,
Andy Shevchenko