tty: serial: 8250_dw: Implement suspend/resume

Implement suspend and resume callbacks for DesignWare 8250 driver.
They're simple wrappers around serial8250_{suspend,resume}_port.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c
index c3b2ec0c8c0b7f3a6749f41feedb38fe0af58ac2..b19b8c54780115172639265e3a9d42ca0297ec22 100644 (file)
--- a/drivers/tty/serial/8250/8250_dw.c
+++ b/drivers/tty/serial/8250/8250_dw.c
@@ -161,6 +161,29 @@ static int __devexit dw8250_remove(struct platform_device *pdev)
        return 0;
 }
 
+#ifdef CONFIG_PM
+static int dw8250_suspend(struct platform_device *pdev, pm_message_t state)
+{
+       struct dw8250_data *data = platform_get_drvdata(pdev);
+
+       serial8250_suspend_port(data->line);
+
+       return 0;
+}
+
+static int dw8250_resume(struct platform_device *pdev)
+{
+       struct dw8250_data *data = platform_get_drvdata(pdev);
+
+       serial8250_resume_port(data->line);
+
+       return 0;
+}
+#else
+#define dw8250_suspend NULL
+#define dw8250_resume NULL
+#endif /* CONFIG_PM */
+
 static const struct of_device_id dw8250_match[] = {
        { .compatible = "snps,dw-apb-uart" },
        { /* Sentinel */ }
@@ -175,6 +198,8 @@ static struct platform_driver dw8250_platform_driver = {
        },
        .probe                  = dw8250_probe,
        .remove                 = __devexit_p(dw8250_remove),
+       .suspend                = dw8250_suspend,
+       .resume                 = dw8250_resume,
 };
 
 module_platform_driver(dw8250_platform_driver);