linux-kernel - [PATCH] serial: 8250: omap: convert to modern PM ops

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Date:   Wed, 17 May 2023 22:20:07 +0200
From:   Arnd Bergmann <arnd@...nel.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        Tony Lindgren <tony@...mide.com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
        Lukas Wunner <lukas@...ner.de>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Matthias Schiffer <matthias.schiffer@...tq-group.com>,
        linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] serial: 8250: omap: convert to modern PM ops

From: Arnd Bergmann <arnd@...db.de>

The new uart_write() function is only called from suspend/resume code, causing
a build warning when those are left out:

drivers/tty/serial/8250/8250_omap.c:169:13: error: 'uart_write' defined but not used [-Werror=unused-function]

Remove the #ifdefs and use the modern pm_ops/pm_sleep_ops and their wrappers
to let the compiler see where it's used but still drop the dead code.

Fixes: 398cecc24846 ("serial: 8250: omap: Fix imprecise external abort for omap_8250_pm()")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/tty/serial/8250/8250_omap.c | 17 +++++------------
 1 file changed, 5 insertions(+), 12 deletions(-)

diff --git a/drivers/tty/serial/8250/8250_omap.c b/drivers/tty/serial/8250/8250_omap.c
index 5c093dfcee1d..00b2c35042ee 100644
--- a/drivers/tty/serial/8250/8250_omap.c
+++ b/drivers/tty/serial/8250/8250_omap.c
@@ -1571,7 +1571,6 @@ static int omap8250_remove(struct platform_device *pdev)
 	return 0;
 }
 
-#ifdef CONFIG_PM_SLEEP
 static int omap8250_prepare(struct device *dev)
 {
 	struct omap8250_priv *priv = dev_get_drvdata(dev);
@@ -1616,12 +1615,7 @@ static int omap8250_resume(struct device *dev)
 	serial8250_resume_port(priv->line);
 	return 0;
 }
-#else
-#define omap8250_prepare NULL
-#define omap8250_complete NULL
-#endif
 
-#ifdef CONFIG_PM
 static int omap8250_lost_context(struct uart_8250_port *up)
 {
 	u32 val;
@@ -1738,7 +1732,6 @@ static int omap8250_runtime_resume(struct device *dev)
 	schedule_work(&priv->qos_work);
 	return 0;
 }
-#endif
 
 #ifdef CONFIG_SERIAL_8250_OMAP_TTYO_FIXUP
 static int __init omap8250_console_fixup(void)
@@ -1781,17 +1774,17 @@ console_initcall(omap8250_console_fixup);
 #endif
 
 static const struct dev_pm_ops omap8250_dev_pm_ops = {
-	SET_SYSTEM_SLEEP_PM_OPS(omap8250_suspend, omap8250_resume)
-	SET_RUNTIME_PM_OPS(omap8250_runtime_suspend,
+	SYSTEM_SLEEP_PM_OPS(omap8250_suspend, omap8250_resume)
+	RUNTIME_PM_OPS(omap8250_runtime_suspend,
 			   omap8250_runtime_resume, NULL)
-	.prepare        = omap8250_prepare,
-	.complete       = omap8250_complete,
+	.prepare        = pm_sleep_ptr(omap8250_prepare),
+	.complete       = pm_sleep_ptr(omap8250_complete),
 };
 
 static struct platform_driver omap8250_platform_driver = {
 	.driver = {
 		.name		= "omap8250",
-		.pm		= &omap8250_dev_pm_ops,
+		.pm		= pm_ptr(&omap8250_dev_pm_ops),
 		.of_match_table = omap8250_dt_ids,
 	},
 	.probe			= omap8250_probe,
-- 
2.39.2