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authorJingchang Lu <jingchang.lu@freescale.com>2014-09-23 16:34:12 +0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-09-28 21:49:13 -0400
commit2dea53bf57783f243c892e99c10c6921e956aa7e (patch)
treedd26ff912119ca5a3159d6c8467f9e5f87169a28 /drivers/tty
parent2c8faf3d652b6b2dffc29e48d968349bd16aa32f (diff)
serial: of-serial: add PM suspend/resume support
This adds PM suspend/resume support for the of-serial driver to provide power management support on devices attatched to it. Signed-off-by: Jingchang Lu <jingchang.lu@freescale.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
-rw-r--r--drivers/tty/serial/of_serial.c27
1 files changed, 27 insertions, 0 deletions
diff --git a/drivers/tty/serial/of_serial.c b/drivers/tty/serial/of_serial.c
index 27981e2b9430..8bc2563335ae 100644
--- a/drivers/tty/serial/of_serial.c
+++ b/drivers/tty/serial/of_serial.c
@@ -240,6 +240,32 @@ static int of_platform_serial_remove(struct platform_device *ofdev)
return 0;
}
+#ifdef CONFIG_PM_SLEEP
+static int of_serial_suspend(struct device *dev)
+{
+ struct of_serial_info *info = dev_get_drvdata(dev);
+
+ serial8250_suspend_port(info->line);
+ if (info->clk)
+ clk_disable_unprepare(info->clk);
+
+ return 0;
+}
+
+static int of_serial_resume(struct device *dev)
+{
+ struct of_serial_info *info = dev_get_drvdata(dev);
+
+ if (info->clk)
+ clk_prepare_enable(info->clk);
+
+ serial8250_resume_port(info->line);
+
+ return 0;
+}
+#endif
+static SIMPLE_DEV_PM_OPS(of_serial_pm_ops, of_serial_suspend, of_serial_resume);
+
/*
* A few common types, add more as needed.
*/
@@ -271,6 +297,7 @@ static struct platform_driver of_platform_serial_driver = {
.name = "of_serial",
.owner = THIS_MODULE,
.of_match_table = of_platform_serial_table,
+ .pm = &of_serial_pm_ops,
},
.probe = of_platform_serial_probe,
.remove = of_platform_serial_remove,