serial: 8250_uniphier: add suspend/resume support

Add suspend/resume support for UniPhier serial driver.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/8250/8250_uniphier.c b/drivers/tty/serial/8250/8250_uniphier.c
index 97a45b798fcd04ccded250fecbb3cb641d565f3d..8a10b10e27aae9b25d6378c3b98235c611b7fbfe 100644 (file)
--- a/drivers/tty/serial/8250/8250_uniphier.c
+++ b/drivers/tty/serial/8250/8250_uniphier.c
@@ -281,6 +281,40 @@ static int uniphier_uart_remove(struct platform_device *pdev)
        return 0;
 }
 
+static int __maybe_unused uniphier_uart_suspend(struct device *dev)
+{
+       struct uniphier8250_priv *priv = dev_get_drvdata(dev);
+       struct uart_8250_port *up = serial8250_get_port(priv->line);
+
+       serial8250_suspend_port(priv->line);
+
+       if (!uart_console(&up->port) || console_suspend_enabled)
+               clk_disable_unprepare(priv->clk);
+
+       return 0;
+}
+
+static int __maybe_unused uniphier_uart_resume(struct device *dev)
+{
+       struct uniphier8250_priv *priv = dev_get_drvdata(dev);
+       struct uart_8250_port *up = serial8250_get_port(priv->line);
+       int ret;
+
+       if (!uart_console(&up->port) || console_suspend_enabled) {
+               ret = clk_prepare_enable(priv->clk);
+               if (ret)
+                       return ret;
+       }
+
+       serial8250_resume_port(priv->line);
+
+       return 0;
+}
+
+static const struct dev_pm_ops uniphier_uart_pm_ops = {
+       SET_SYSTEM_SLEEP_PM_OPS(uniphier_uart_suspend, uniphier_uart_resume)
+};
+
 static const struct of_device_id uniphier_uart_match[] = {
        { .compatible = "socionext,uniphier-uart" },
        { /* sentinel */ }
@@ -293,6 +327,7 @@ static struct platform_driver uniphier_uart_platform_driver = {
        .driver = {
                .name   = "uniphier-uart",
                .of_match_table = uniphier_uart_match,
+               .pm = &uniphier_uart_pm_ops,
        },
 };
 module_platform_driver(uniphier_uart_platform_driver);