linux-kernel - [PATCH v2 3/7] serial: liteuart: remove unused uart

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Message-Id: <20221110004450.772768-4-gsomlo@gmail.com>
Date:   Wed,  9 Nov 2022 19:44:46 -0500
From:   Gabriel Somlo <gsomlo@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     linux-serial@...r.kernel.org, gregkh@...uxfoundation.org,
        jirislaby@...nel.org, kgugala@...micro.com, mholenko@...micro.com,
        joel@....id.au, david.abdurachmanov@...il.com,
        florent@...oy-digital.fr, geert@...ux-m68k.org
Subject: [PATCH v2 3/7] serial: liteuart: remove unused uart_ops stubs

Remove stub uart_ops methods that are not called unconditionally
from serial_core. Document stubs that are expected to be present.

Signed-off-by: Gabriel Somlo <gsomlo@...il.com>
---
 drivers/tty/serial/liteuart.c | 18 +-----------------
 1 file changed, 1 insertion(+), 17 deletions(-)

diff --git a/drivers/tty/serial/liteuart.c b/drivers/tty/serial/liteuart.c
index 1497d4cdc221..90f6280c5452 100644
--- a/drivers/tty/serial/liteuart.c
+++ b/drivers/tty/serial/liteuart.c
@@ -122,6 +122,7 @@ static unsigned int liteuart_get_mctrl(struct uart_port *port)
 
 static void liteuart_stop_tx(struct uart_port *port)
 {
+	/* not used in LiteUART, but called unconditionally from serial_core */
 }
 
 static void liteuart_start_tx(struct uart_port *port)
@@ -154,11 +155,6 @@ static void liteuart_stop_rx(struct uart_port *port)
 	del_timer(&uart->timer);
 }
 
-static void liteuart_break_ctl(struct uart_port *port, int break_state)
-{
-	/* LiteUART doesn't support sending break signal */
-}
-
 static int liteuart_startup(struct uart_port *port)
 {
 	struct liteuart_port *uart = to_liteuart_port(port);
@@ -197,15 +193,6 @@ static const char *liteuart_type(struct uart_port *port)
 	return "liteuart";
 }
 
-static void liteuart_release_port(struct uart_port *port)
-{
-}
-
-static int liteuart_request_port(struct uart_port *port)
-{
-	return 0;
-}
-
 static void liteuart_config_port(struct uart_port *port, int flags)
 {
 	/*
@@ -232,13 +219,10 @@ static const struct uart_ops liteuart_ops = {
 	.stop_tx	= liteuart_stop_tx,
 	.start_tx	= liteuart_start_tx,
 	.stop_rx	= liteuart_stop_rx,
-	.break_ctl	= liteuart_break_ctl,
 	.startup	= liteuart_startup,
 	.shutdown	= liteuart_shutdown,
 	.set_termios	= liteuart_set_termios,
 	.type		= liteuart_type,
-	.release_port	= liteuart_release_port,
-	.request_port	= liteuart_request_port,
 	.config_port	= liteuart_config_port,
 	.verify_port	= liteuart_verify_port,
 };
-- 
2.37.3