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

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Date:   Thu, 24 Feb 2022 10:55:54 +0100
From:   Jiri Slaby <jslaby@...e.cz>
To:     gregkh@...uxfoundation.org
Cc:     linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 1/5] tty: serial: define UART_LCR_WLEN() macro

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)
 
 /*
  * Access to some registers depends on register access / configuration
-- 
2.35.1