linux-kernel - Re: [PATCH v1 02/14] serial: core: Add UPIO

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Date: Thu, 22 Feb 2024 07:58:32 +0100
From: Jiri Slaby <jirislaby@...nel.org>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 Thomas Gleixner <tglx@...utronix.de>, linux-kernel@...r.kernel.org,
 linux-serial@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-aspeed@...ts.ozlabs.org, linux-rpi-kernel@...ts.infradead.org,
 linux-mips@...r.kernel.org, linux-tegra@...r.kernel.org
Cc: Joel Stanley <joel@....id.au>,
 Andrew Jeffery <andrew@...econstruct.com.au>,
 Florian Fainelli <florian.fainelli@...adcom.com>, Ray Jui
 <rjui@...adcom.com>, Scott Branden <sbranden@...adcom.com>,
 Broadcom internal kernel review list
 <bcm-kernel-feedback-list@...adcom.com>, Al Cooper <alcooperx@...il.com>,
 Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
 Paul Cercueil <paul@...pouillou.net>, Vladimir Zapolskiy <vz@...ia.com>,
 Thierry Reding <thierry.reding@...il.com>,
 Jonathan Hunter <jonathanh@...dia.com>,
 Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>,
 Masami Hiramatsu <mhiramat@...nel.org>
Subject: Re: [PATCH v1 02/14] serial: core: Add UPIO_UNSET constant for unset
 port type

On 21. 02. 24, 19:31, Andy Shevchenko wrote:
> In some APIs we would like to assign the special value to iotype
> and compare against it in another places. Introduce UPIO_UNSET
> for this purpose.
> 
> Note, we can't use 0, because it's a valid value for IO port access.
> 
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> ---
>   include/linux/serial_core.h | 1 +
>   1 file changed, 1 insertion(+)
> 
> diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
> index 2d2ec99eca93..2b0526ae1fac 100644
> --- a/include/linux/serial_core.h
> +++ b/include/linux/serial_core.h
> @@ -470,6 +470,7 @@ struct uart_port {
>   
>   	unsigned char		iotype;			/* io access style */
>   
> +#define UPIO_UNSET		((unsigned char)~0U)	/* UCHAR_MAX */

Perhaps making the var u8 and this U8_MAX then? It would make more sense 
to me.

>   #define UPIO_PORT		(SERIAL_IO_PORT)	/* 8b I/O port access */
>   #define UPIO_HUB6		(SERIAL_IO_HUB6)	/* Hub6 ISA card */
>   #define UPIO_MEM		(SERIAL_IO_MEM)		/* driver-specific */

thanks,
-- 
js
suse labs