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tty: serial: define UART_LCR_WLEN() macro

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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@suse.cz>
Link: https://lore.kernel.org/r/20220224095558.30929-1-jslaby@suse.cz
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jiri Slaby 2022-02-24 10:55:54 +01:00 committed by Greg Kroah-Hartman
parent d4ab5487cc
commit 797bd4d41c
1 changed files with 2 additions and 0 deletions
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2
include/linux/serial.h
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@ -12,6 +12,8 @@
#include <asm/page.h>
#include <uapi/linux/serial.h>
/* Helper for dealing with UART_LCR_WLEN* defines */
#define UART_LCR_WLEN(x) ((x) - 5)
/*
* Counters of the input lines (CTS, DSR, RI, CD) interrupts