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serial: of-serial: add PM suspend/resume support

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This adds suspend/resume support for the of-serial driver
to provide power management support on devices attatched.

The handling may vary since not every of_serial device is
an 8250 port. Currently only 8250 port handling is added
in the suspend/resume function based on the type switch.

Signed-off-by: Jingchang Lu <[email protected]>
Acked-by: Arnd Bergmann <[email protected]>
Tested-by: Joseph Lo <[email protected]>
Reviewed-by: Peter Hurley <[email protected]>
Tested-by: Florina Fainelli <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Jingchang Lu 2014-11-11 15:09:05 +08:00 • committed by Greg Kroah-Hartman
commit 8ad3b13526
1 changed files with 66 additions and 0 deletions
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66
drivers/tty/serial/of_serial.c
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@ -9,6 +9,7 @@
* 2 of the License, or (at your option) any later version.
*
*/
#include <linux/console.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/delay.h>
@ -247,6 +248,70 @@ static int of_platform_serial_remove(struct platform_device *ofdev)
return 0;
}
#ifdef CONFIG_PM_SLEEP
#ifdef CONFIG_SERIAL_8250
static void of_serial_suspend_8250(struct of_serial_info *info)
{
struct uart_8250_port *port8250 = serial8250_get_port(info->line);
struct uart_port *port = &port8250->port;
serial8250_suspend_port(info->line);
if (info->clk && (!uart_console(port) || console_suspend_enabled))
clk_disable_unprepare(info->clk);
}
static void of_serial_resume_8250(struct of_serial_info *info)
{
struct uart_8250_port *port8250 = serial8250_get_port(info->line);
struct uart_port *port = &port8250->port;
if (info->clk && (!uart_console(port) || console_suspend_enabled))
clk_prepare_enable(info->clk);
serial8250_resume_port(info->line);
}
#else
static inline void of_serial_suspend_8250(struct of_serial_info *info)
{
}
static inline void of_serial_resume_8250(struct of_serial_info *info)
{
}
#endif
static int of_serial_suspend(struct device *dev)
{
struct of_serial_info *info = dev_get_drvdata(dev);
switch (info->type) {
case PORT_8250 ... PORT_MAX_8250:
of_serial_suspend_8250(info);
break;
default:
break;
}
return 0;
}
static int of_serial_resume(struct device *dev)
{
struct of_serial_info *info = dev_get_drvdata(dev);
switch (info->type) {
case PORT_8250 ... PORT_MAX_8250:
of_serial_resume_8250(info);
break;
default:
break;
}
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.
*/
@ -279,6 +344,7 @@ 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,