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Message-ID: <ZAx1JOvjgOOYCNY9@corigine.com>
Date: Sat, 11 Mar 2023 13:33:40 +0100
From: Simon Horman <simon.horman@...igine.com>
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, leon@...nel.org,
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 v8 1/3] serdev: Add method to assert break signal over
tty UART port
On Fri, Mar 10, 2023 at 11:49:19PM +0530, Neeraj Sanjay Kale wrote:
> Adds serdev_device_break_ctl() and an implementation for ttyport.
> This function simply calls the break_ctl in tty layer, which can
> assert a break signal over UART-TX line, if the tty and the
> underlying platform and UART peripheral supports this operation.
>
> Signed-off-by: Neeraj Sanjay Kale <neeraj.sanjaykale@....com>
> ---
> v3: Add details to the commit message. (Greg KH)
...
> diff --git a/include/linux/serdev.h b/include/linux/serdev.h
> index 66f624fc618c..c065ef1c82f1 100644
> --- a/include/linux/serdev.h
> +++ b/include/linux/serdev.h
...
> @@ -255,6 +257,10 @@ static inline int serdev_device_set_tiocm(struct serdev_device *serdev, int set,
> {
> return -ENOTSUPP;
> }
> +static inline int serdev_device_break_ctl(struct serdev_device *serdev, int break_state)
> +{
> + return -EOPNOTSUPP;
Is the use of -EOPNOTSUPP intentional here?
I see -ENOTSUPP is used elsewhere in this file.
> +}
> static inline int serdev_device_write(struct serdev_device *sdev, const unsigned char *buf,
> size_t count, unsigned long timeout)
> {
> --
> 2.34.1
>
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