diff options
| author | Stefan Wahren <wahrenst@gmx.net> | 2024-07-28 15:00:28 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-07-31 12:34:51 +0200 |
| commit | 0e1d8780526f4bc683699348d0c765ca78ae37bb (patch) | |
| tree | 91c9a46953465772a144a653e58f04dae6b4ef9f /drivers/tty | |
| parent | arm64: dts: mediatek: mt7981: add UART controllers (diff) | |
| download | linux-0e1d8780526f4bc683699348d0c765ca78ae37bb.tar.xz linux-0e1d8780526f4bc683699348d0c765ca78ae37bb.zip | |
serial: 8250_bcm2835aux: add PM suspend/resume support
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>
Link: https://lore.kernel.org/r/20240728130029.78279-7-wahrenst@gmx.net
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
| -rw-r--r-- | drivers/tty/serial/8250/8250_bcm2835aux.c | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/drivers/tty/serial/8250/8250_bcm2835aux.c b/drivers/tty/serial/8250/8250_bcm2835aux.c index 121a5ce86050..36e2bb34d82b 100644 --- a/drivers/tty/serial/8250/8250_bcm2835aux.c +++ b/drivers/tty/serial/8250/8250_bcm2835aux.c @@ -13,6 +13,7 @@ */ #include <linux/clk.h> +#include <linux/console.h> #include <linux/io.h> #include <linux/module.h> #include <linux/of.h> @@ -213,11 +214,47 @@ static const struct acpi_device_id bcm2835aux_serial_acpi_match[] = { }; MODULE_DEVICE_TABLE(acpi, bcm2835aux_serial_acpi_match); +static int bcm2835aux_suspend(struct device *dev) +{ + struct bcm2835aux_data *data = dev_get_drvdata(dev); + struct uart_8250_port *up = serial8250_get_port(data->line); + + serial8250_suspend_port(data->line); + + if (device_may_wakeup(dev)) + return 0; + + if (uart_console(&up->port) && !console_suspend_enabled) + return 0; + + clk_disable_unprepare(data->clk); + return 0; +} + +static int bcm2835aux_resume(struct device *dev) +{ + struct bcm2835aux_data *data = dev_get_drvdata(dev); + int ret; + + ret = clk_prepare_enable(data->clk); + if (ret) + return ret; + + serial8250_resume_port(data->line); + + return 0; +} + +static const struct dev_pm_ops bcm2835aux_dev_pm_ops = { + 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 = pm_ptr(&bcm2835aux_dev_pm_ops), }, .probe = bcm2835aux_serial_probe, .remove_new = bcm2835aux_serial_remove, |