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>
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@ -13,6 +13,7 @@
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*/
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#include <linux/clk.h>
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#include <linux/console.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/of.h>
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@ -213,11 +214,47 @@ static const struct acpi_device_id bcm2835aux_serial_acpi_match[] = {
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};
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MODULE_DEVICE_TABLE(acpi, bcm2835aux_serial_acpi_match);
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static int bcm2835aux_suspend(struct device *dev)
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{
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struct bcm2835aux_data *data = dev_get_drvdata(dev);
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struct uart_8250_port *up = serial8250_get_port(data->line);
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serial8250_suspend_port(data->line);
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if (device_may_wakeup(dev))
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return 0;
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if (uart_console(&up->port) && !console_suspend_enabled)
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return 0;
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clk_disable_unprepare(data->clk);
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return 0;
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}
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static int bcm2835aux_resume(struct device *dev)
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{
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struct bcm2835aux_data *data = dev_get_drvdata(dev);
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int ret;
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ret = clk_prepare_enable(data->clk);
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if (ret)
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return ret;
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serial8250_resume_port(data->line);
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return 0;
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}
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static const struct dev_pm_ops bcm2835aux_dev_pm_ops = {
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SYSTEM_SLEEP_PM_OPS(bcm2835aux_suspend, bcm2835aux_resume)
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};
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static struct platform_driver bcm2835aux_serial_driver = {
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.driver = {
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.name = "bcm2835-aux-uart",
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.of_match_table = bcm2835aux_serial_match,
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.acpi_match_table = bcm2835aux_serial_acpi_match,
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.pm = pm_ptr(&bcm2835aux_dev_pm_ops),
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},
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.probe = bcm2835aux_serial_probe,
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.remove_new = bcm2835aux_serial_remove,
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