[PATCH RFT 10/11] serial: 8250_bcm2835aux: add PM suspend/resume support

Stefan Wahren
2024-06-30T16:53:59Z

This adds suspend/resume support for the 8250_bcm2835aux
driver to provide power management support on attached
devices.

Signed-off-by: Stefan Wahren <wahrenst@gmx.net>
---

Since i don't have a RS485 setup, any test feedback would be great.

drivers/tty/serial/8250/8250_bcm2835aux.c | 23 +++++++++++++++++++++++
1 file changed, 23 insertions(+)

diff --git a/drivers/tty/serial/8250/8250_bcm2835aux.c b/drivers/tty/serial/8250/8250_bcm2835aux.c
index 121a5ce86050..cccd2a09cb6f 100644
--- a/drivers/tty/serial/8250/8250_bcm2835aux.c
+++ b/drivers/tty/serial/8250/8250_bcm2835aux.c
@@ -213,11 +213,34 @@ static const struct acpi_device_id bcm2835aux_serial_acpi_match[] = {
};
MODULE_DEVICE_TABLE(acpi, bcm2835aux_serial_acpi_match);

+static int __maybe_unused bcm2835aux_suspend(struct device *dev)
+{
+ struct bcm2835aux_data *data = dev_get_drvdata(dev);
+
+ serial8250_suspend_port(data->line);
+
+ return 0;
+}
+
+static int __maybe_unused bcm2835aux_resume(struct device *dev)
+{
+ struct bcm2835aux_data *data = dev_get_drvdata(dev);
+
+ serial8250_resume_port(data->line);
+
+ return 0;
+}
+
+static const struct dev_pm_ops bcm2835aux_dev_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(bcm2835aux_suspend, bcm2835aux_resume)
+};
+
static struct platform_driver bcm2835aux_serial_driver = {
.driver = {
.name = "bcm2835-aux-uart",
.of_match_table = bcm2835aux_serial_match,
.acpi_match_table = bcm2835aux_serial_acpi_match,
+ .pm = &bcm2835aux_dev_pm_ops,
},
.probe = bcm2835aux_serial_probe,
.remove_new = bcm2835aux_serial_remove,
--
2.34.1