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

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Message-ID: <d18d4488-aa48-4156-8087-a117664cea7b@gmail.com>
Date: Wed, 21 Feb 2024 10:47:13 -0800
From: Florian Fainelli <f.fainelli@...il.com>
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: Jiri Slaby <jirislaby@...nel.org>, 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 2/21/24 10:31, 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 */

Nit: I would name this UPIO_UNKNOWN, or UPIO_NOTSET, unset means to me 
that it was previously set and we undid that action, whereas unknown or 
not set means we never did.
-- 
Florian