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serial: 8250_bcm2835aux: add PM suspend/resume support

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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>
This commit is contained in:
Stefan Wahren 2024-07-28 15:00:28 +02:00 committed by Greg Kroah-Hartman
parent 254a6b0ba0
commit 0e1d878052
1 changed files with 37 additions and 0 deletions
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37
drivers/tty/serial/8250/8250_bcm2835aux.c
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@ -13,6 +13,7 @@
*/ */
#include <linux/clk.h> #include <linux/clk.h>
#include <linux/console.h>
#include <linux/io.h> #include <linux/io.h>
#include <linux/module.h> #include <linux/module.h>
#include <linux/of.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); 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 = { static struct platform_driver bcm2835aux_serial_driver = {
.driver = { .driver = {
.name = "bcm2835-aux-uart", .name = "bcm2835-aux-uart",
.of_match_table = bcm2835aux_serial_match, .of_match_table = bcm2835aux_serial_match,
.acpi_match_table = bcm2835aux_serial_acpi_match, .acpi_match_table = bcm2835aux_serial_acpi_match,
.pm = pm_ptr(&bcm2835aux_dev_pm_ops),
}, },
.probe = bcm2835aux_serial_probe, .probe = bcm2835aux_serial_probe,
.remove_new = bcm2835aux_serial_remove, .remove_new = bcm2835aux_serial_remove,