[PATCH] serial: of-serial: add PM suspend/resume support
From: Jingchang Lu <hidden>
Date: 2014-09-23 09:42:28
Also in:
linux-devicetree, linux-serial, lkml
Subsystem:
the rest, tty layer and serial drivers · Maintainers:
Linus Torvalds, Greg Kroah-Hartman, Jiri Slaby
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 <redacted> --- drivers/tty/serial/of_serial.c | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+)
diff --git a/drivers/tty/serial/of_serial.c b/drivers/tty/serial/of_serial.c
index 27981e2..8bc2563 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,
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1.8.0