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authorMasahiro Yamada <yamada.masahiro@socionext.com>2017-08-08 16:48:43 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-08-28 21:51:22 +0300
commit3d16ddc13c5e56726d05b4eceb766b06483e3686 (patch)
tree7a818903386aa9124faa1f3afaac92b17bf2cd68 /drivers/tty
parentd3a9184773c5cde483e249096ae7c7f98f310e20 (diff)
downloadlinux-3d16ddc13c5e56726d05b4eceb766b06483e3686.tar.xz
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>
Diffstat (limited to 'drivers/tty')
-rw-r--r--drivers/tty/serial/8250/8250_uniphier.c35
1 files changed, 35 insertions, 0 deletions
diff --git a/drivers/tty/serial/8250/8250_uniphier.c b/drivers/tty/serial/8250/8250_uniphier.c
index 97a45b798fcd..8a10b10e27aa 100644
--- 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);