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serial: 8250_uniphier: add suspend/resume support

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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>
This commit is contained in:
Masahiro Yamada 2017-08-08 22:48:43 +09:00 committed by Greg Kroah-Hartman
parent d3a9184773
commit 3d16ddc13c
1 changed files with 35 additions and 0 deletions
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35
drivers/tty/serial/8250/8250_uniphier.c
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@ -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);