linux-kernel - Re: [PATCH v2 1/3] serdev: Add method to assert break

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Date:   Tue, 31 Jan 2023 10:57:23 +0200
From:   Leon Romanovsky <leon@...nel.org>
To:     Neeraj Sanjay Kale <neeraj.sanjaykale@....com>
Cc:     davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, marcel@...tmann.org,
        johan.hedberg@...il.com, luiz.dentz@...il.com,
        gregkh@...uxfoundation.org, jirislaby@...nel.org,
        alok.a.tiwari@...cle.com, hdanton@...a.com,
        ilpo.jarvinen@...ux.intel.com, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-bluetooth@...r.kernel.org, linux-serial@...r.kernel.org,
        amitkumar.karwar@....com, rohit.fule@....com, sherry.sun@....com
Subject: Re: [PATCH v2 1/3] serdev: Add method to assert break

On Mon, Jan 30, 2023 at 11:35:02PM +0530, Neeraj Sanjay Kale wrote:
> Adds serdev_device_break_ctl() and an implementation for ttyport.
> 
> Signed-off-by: Neeraj Sanjay Kale <neeraj.sanjaykale@....com>
> ---
>  drivers/tty/serdev/core.c           | 11 +++++++++++
>  drivers/tty/serdev/serdev-ttyport.c | 12 ++++++++++++
>  include/linux/serdev.h              |  6 ++++++
>  3 files changed, 29 insertions(+)

<...>

> +{
> +	struct serport *serport = serdev_controller_get_drvdata(ctrl);
> +	struct tty_struct *tty = serport->tty;
> +
> +	if (!tty->ops->break_ctl)
> +		return -ENOTSUPP;

Documentation/dev-tools/checkpatch.rst
   429   **ENOTSUPP**
   430     ENOTSUPP is not a standard error code and should be avoided in new patches.
   431     EOPNOTSUPP should be used instead.
   432 
   433     See: https://lore.kernel.org/netdev/20200510182252.GA411829@lunn.ch/

Thanks