linux-kernel - Re: [PATCH 1/6] serial: 8250: remove AR7 support

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Date:   Thu, 21 Sep 2023 12:36:05 +0200
From:   Philippe Mathieu-Daudé <philmd@...aro.org>
To:     Wolfram Sang <wsa+renesas@...g-engineering.com>,
        linux-mips@...r.kernel.org
Cc:     Jonas Gorski <jonas.gorski@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: Re: [PATCH 1/6] serial: 8250: remove AR7 support

Hi Wolfram,

(Adding Andy for commit 54b45ee8bd42 "serial: core: Remove
unused PORT_* definitions").

On 20/9/23 22:10, Wolfram Sang wrote:
> AR7 is going to be removed from the Kernel, so remove its type
> definition from 8250 code. As with previous removals, I checked with
> Debian Code Search that 'PORT_AR7' is not used in userspace.
> 
> Signed-off-by: Wolfram Sang <wsa+renesas@...g-engineering.com>
> ---
>   drivers/tty/serial/8250/8250_port.c | 7 -------
>   include/uapi/linux/serial_core.h    | 1 -
>   2 files changed, 8 deletions(-)


> diff --git a/include/uapi/linux/serial_core.h b/include/uapi/linux/serial_core.h
> index add349889d0a..3b51901926f9 100644
> --- a/include/uapi/linux/serial_core.h
> +++ b/include/uapi/linux/serial_core.h
> @@ -32,7 +32,6 @@
>   #define PORT_XSCALE	15
>   #define PORT_RM9000	16	/* PMC-Sierra RM9xxx internal UART */
>   #define PORT_OCTEON	17	/* Cavium OCTEON internal UART */
> -#define PORT_AR7	18	/* Texas Instruments AR7 internal UART */

I'm a bit surprised definitions are removed from the uAPI, isn't
it expected to be very stable? Shouldn't it be better to keep it
defined but modify the comment, mentioning "obsolete" or "deprecated"?

Regards,

Phil.

>   #define PORT_U6_16550A	19	/* ST-Ericsson U6xxx internal UART */
>   #define PORT_TEGRA	20	/* NVIDIA Tegra internal UART */
>   #define PORT_XR17D15X	21	/* Exar XR17D15x UART */