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 97a45b79..8a10b10 100644
--- a/drivers/tty/serial/8250/8250_uniphier.c
+++ b/drivers/tty/serial/8250/8250_uniphier.c
@@ -281,6 +281,40 @@
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 @@
.driver = {
.name = "uniphier-uart",
.of_match_table = uniphier_uart_match,
+ .pm = &uniphier_uart_pm_ops,
},
};
module_platform_driver(uniphier_uart_platform_driver);