From 915cad947438c87d5f4245880778a07cb14d2fbd Mon Sep 17 00:00:00 2001
From: Jingchang Lu <jingchang.lu@freescale.com>
Date: Mon, 22 Sep 2014 16:58:24 +0800
Subject: 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>

This patch has been sent to upstream for review:
https://patchwork.kernel.org/patch/4954521/
Change-Id: I06905237f7d7ef51bf5a1c135cd0880d92c4c104
Reviewed-on: http://git.am.freescale.net:8181/19728
Tested-by: Review Code-CDREVIEW <CDREVIEW@freescale.com>
Reviewed-by: Chenhui Zhao <chenhui.zhao@freescale.com>
Reviewed-by: Li Xiubo <Li.Xiubo@freescale.com>
Reviewed-by: Zhengxiong Jin <Jason.Jin@freescale.com>

diff --git a/drivers/tty/serial/of_serial.c b/drivers/tty/serial/of_serial.c
index b4507be..a320fc5 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.
  */
@@ -273,6 +299,7 @@ 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,
-- 
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