Commit 0e1d8780 authored by Stefan Wahren's avatar Stefan Wahren Committed by Greg Kroah-Hartman
Browse files

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: default avatarStefan Wahren <wahrenst@gmx.net>
Link: https://lore.kernel.org/r/20240728130029.78279-7-wahrenst@gmx.net


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 254a6b0b

drivers/tty/serial/8250/8250_bcm2835aux.c

+37 −0
Original line number Diff line number Diff line
@@ -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,