linux-kernel - [PATCH] tty: serial: meson: enable console as module

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Date:   Thu, 10 Dec 2020 16:57:44 -0800
From:   Kevin Hilman <khilman@...libre.com>
To:     linux-serial@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        Neil Armstrong <narmstrong@...libre.com>,
        Jerome Brunet <jbrunet@...libre.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        linux-kernel@...r.kernel.org (open list),
        linux-arm-kernel@...ts.infradead.org (moderated list:ARM/Amlogic Meson
        SoC support),
        linux-amlogic@...ts.infradead.org (open list:ARM/Amlogic Meson SoC
        support)
Subject: [PATCH] tty: serial: meson: enable console as module

Enable serial driver to be built as a module.  To do so, init the
console support on driver/module load instead of using
console_initcall().

Signed-off-by: Kevin Hilman <khilman@...libre.com>
---
Yes, I'm well aware that having the serial console as a module makes
devices hard to debug, so I'm not changing any default behavior.  The
goal is just to enable building as a module for environments where
serial debug is not available or needed.

 drivers/tty/serial/Kconfig      | 2 +-
 drivers/tty/serial/meson_uart.c | 8 +++++++-
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
index 1044fc387691..c3fa78e63357 100644
--- a/drivers/tty/serial/Kconfig
+++ b/drivers/tty/serial/Kconfig
@@ -206,7 +206,7 @@ config SERIAL_MESON
 
 config SERIAL_MESON_CONSOLE
 	bool "Support for console on meson"
-	depends on SERIAL_MESON=y
+	depends on SERIAL_MESON
 	select SERIAL_CORE_CONSOLE
 	select SERIAL_EARLYCON
 	help
diff --git a/drivers/tty/serial/meson_uart.c b/drivers/tty/serial/meson_uart.c
index d2c08b760f83..69eeef9edfa5 100644
--- a/drivers/tty/serial/meson_uart.c
+++ b/drivers/tty/serial/meson_uart.c
@@ -604,7 +604,6 @@ static int __init meson_serial_console_init(void)
 	register_console(&meson_serial_console);
 	return 0;
 }
-console_initcall(meson_serial_console_init);
 
 static void meson_serial_early_console_write(struct console *co,
 					     const char *s,
@@ -634,6 +633,9 @@ OF_EARLYCON_DECLARE(meson, "amlogic,meson-ao-uart",
 
 #define MESON_SERIAL_CONSOLE	(&meson_serial_console)
 #else
+static int __init meson_serial_console_init(void) {
+	return 0;
+}
 #define MESON_SERIAL_CONSOLE	NULL
 #endif
 
@@ -824,6 +826,10 @@ static int __init meson_uart_init(void)
 {
 	int ret;
 
+	ret = meson_serial_console_init();
+	if (ret)
+		return ret;
+	
 	ret = uart_register_driver(&meson_uart_driver);
 	if (ret)
 		return ret;
-- 
2.29.2