watchdog: txx9: Stop using module_platform_driver_probe()

On today's platforms the benefit of platform_driver_probe() isn't that
relevant any more. It allows to drop some code after booting (or module
loading) for .probe() and discard the .remove() function completely if
the driver is built-in. This typically saves a few 100k.

The downside of platform_driver_probe() is that the driver cannot be
bound and unbound at runtime which is ancient and also slightly
complicates testing. There are also thoughts to deprecate
platform_driver_probe() because it adds some complexity in the driver
core for little gain. Also many drivers don't use it correctly. This
driver for example misses to mark the driver struct with __refdata which
is needed to suppress a (W=1) modpost warning:

	WARNING: modpost: drivers/watchdog/txx9wdt: section mismatch in reference: txx9wdt_driver+0x4 (section: .data) -> txx9wdt_remove (section: .exit.text)

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20231106154807.3866712-3-u.kleine-koenig@pengutronix.de
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>

Author: Uwe Kleine-König

drivers/watchdog/txx9wdt.c

@@ -98,7 +98,7 @@ static struct watchdog_device txx9wdt = {
 	.ops = &txx9wdt_ops,
 };
 
-static int __init txx9wdt_probe(struct platform_device *dev)
+static int txx9wdt_probe(struct platform_device *dev)
 {
 	int ret;
 
@@ -145,7 +145,7 @@ static int __init txx9wdt_probe(struct platform_device *dev)
 	return ret;
 }
 
-static int __exit txx9wdt_remove(struct platform_device *dev)
+static int txx9wdt_remove(struct platform_device *dev)
 {
 	watchdog_unregister_device(&txx9wdt);
 	clk_disable_unprepare(txx9_imclk);
@@ -159,14 +159,14 @@ static void txx9wdt_shutdown(struct platform_device *dev)
 }
 
 static struct platform_driver txx9wdt_driver = {
-	.remove = __exit_p(txx9wdt_remove),
+	.probe = txx9wdt_probe,
+	.remove = txx9wdt_remove,
 	.shutdown = txx9wdt_shutdown,
 	.driver = {
 		.name = "txx9wdt",
 	},
 };
-
-module_platform_driver_probe(txx9wdt_driver, txx9wdt_probe);
+module_platform_driver(txx9wdt_driver);
 
 MODULE_DESCRIPTION("TXx9 Watchdog Driver");
 MODULE_LICENSE("GPL");