linux-kernel - Re: [PATCH 1/5] tty: serial: define UART_LCR

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Date:   Fri, 25 Feb 2022 10:40:10 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Jiri Slaby <jslaby@...e.cz>
Cc:     linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/5] tty: serial: define UART_LCR_WLEN() macro

On Thu, Feb 24, 2022 at 12:23:41PM +0100, Greg KH wrote:
> On Thu, Feb 24, 2022 at 11:42:20AM +0100, Jiri Slaby wrote:
> > On 24. 02. 22, 11:10, Greg KH wrote:
> > > On Thu, Feb 24, 2022 at 10:55:54AM +0100, Jiri Slaby wrote:
> > > > Define a generic UART_LCR_WLEN() macro with a size argument. It can be
> > > > used to encode byte size into an LCR value. Therefore we can use it to
> > > > simplify the drivers using tty_get_char_size() in the next patches.
> > > > 
> > > > Signed-off-by: Jiri Slaby <jslaby@...e.cz>
> > > > ---
> > > >   include/uapi/linux/serial_reg.h | 1 +
> > > >   1 file changed, 1 insertion(+)
> > > > 
> > > > diff --git a/include/uapi/linux/serial_reg.h b/include/uapi/linux/serial_reg.h
> > > > index f51bc8f36813..c9d5ff6dd4c6 100644
> > > > --- a/include/uapi/linux/serial_reg.h
> > > > +++ b/include/uapi/linux/serial_reg.h
> > > > @@ -111,6 +111,7 @@
> > > >   #define UART_LCR_WLEN6		0x01 /* Wordlength: 6 bits */
> > > >   #define UART_LCR_WLEN7		0x02 /* Wordlength: 7 bits */
> > > >   #define UART_LCR_WLEN8		0x03 /* Wordlength: 8 bits */
> > > > +#define UART_LCR_WLEN(x)	((x) - 5)
> > > 
> > > I'm all for this, but why does it need to be in a uapi .h file?
> > 
> > I'd love to put it somewhere else. But I didn't find an appropriate place.
> > Should I put it simply to
> > include/linux/serial_core.h
> > or
> > include/linux/serial.h
> 
> This one would make sense.

I'll fix this up on my own, no need to resend this...

thanks

greg k-h