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can: tcan4x5x: support resuming from rx interrupt signal

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Implement the "wakeup-source" device tree property, so the chip is left
running when suspending, and its rx interrupt is used as a wakeup source
to resume operation.

Signed-off-by: Martin Hundebøll <martin@geanix.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Martin Hundebøll 2023-11-13 14:14:51 +01:00 committed by Marc Kleine-Budde
parent 4a94d7e31c
commit b6b640c044
1 changed files with 32 additions and 2 deletions
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34
drivers/net/can/m_can/tcan4x5x-core.c
View file

@ -411,7 +411,7 @@ static int tcan4x5x_can_probe(struct spi_device *spi)
priv->spi = spi;
mcan_class->pm_clock_support = 0;
mcan_class->pm_wake_source = 0;
mcan_class->pm_wake_source = device_property_read_bool(&spi->dev, "wakeup-source");
mcan_class->can.clock.freq = freq;
mcan_class->dev = &spi->dev;
mcan_class->ops = &tcan4x5x_ops;
@ -460,6 +460,9 @@ static int tcan4x5x_can_probe(struct spi_device *spi)
goto out_power;
}
if (mcan_class->pm_wake_source)
device_init_wakeup(&spi->dev, true);
ret = m_can_class_register(mcan_class);
if (ret) {
dev_err(&spi->dev, "Failed registering m_can device %pe\n",
@ -488,6 +491,29 @@ static void tcan4x5x_can_remove(struct spi_device *spi)
m_can_class_free_dev(priv->cdev.net);
}
static int __maybe_unused tcan4x5x_suspend(struct device *dev)
{
struct m_can_classdev *cdev = dev_get_drvdata(dev);
struct spi_device *spi = to_spi_device(dev);
if (cdev->pm_wake_source)
enable_irq_wake(spi->irq);
return m_can_class_suspend(dev);
}
static int __maybe_unused tcan4x5x_resume(struct device *dev)
{
struct m_can_classdev *cdev = dev_get_drvdata(dev);
struct spi_device *spi = to_spi_device(dev);
int ret = m_can_class_resume(dev);
if (cdev->pm_wake_source)
disable_irq_wake(spi->irq);
return ret;
}
static const struct of_device_id tcan4x5x_of_match[] = {
{
.compatible = "ti,tcan4x5x",
@ -506,11 +532,15 @@ static const struct spi_device_id tcan4x5x_id_table[] = {
};
MODULE_DEVICE_TABLE(spi, tcan4x5x_id_table);
static const struct dev_pm_ops tcan4x5x_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(tcan4x5x_suspend, tcan4x5x_resume)
};
static struct spi_driver tcan4x5x_can_driver = {
.driver = {
.name = KBUILD_MODNAME,
.of_match_table = tcan4x5x_of_match,
.pm = NULL,
.pm = &tcan4x5x_pm_ops,
},
.id_table = tcan4x5x_id_table,
.probe = tcan4x5x_can_probe,