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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>
This commit is contained in:
Jingchang Lu 2014-09-23 16:34:12 +08:00 committed by Greg Kroah-Hartman
parent 2c8faf3d65
commit 2dea53bf57
1 changed files with 27 additions and 0 deletions
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27
drivers/tty/serial/of_serial.c
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@ -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,