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@xxxxxxxxxx>
---
Change in v3:
* Updated to use the property in struct m_can_classdev instead of
passing parameters to suspend/resume functions.
Change in v2:
* Added `static` keyword to dev_pm_ops sturcture
drivers/net/can/m_can/tcan4x5x-core.c | 34 +++++++++++++++++++++++++--
1 file changed, 32 insertions(+), 2 deletions(-)
diff --git a/drivers/net/can/m_can/tcan4x5x-core.c b/drivers/net/can/m_can/tcan4x5x-core.c
index 870ab4aef610..0f4c2ac7e4f6 100644
--- a/drivers/net/can/m_can/tcan4x5x-core.c
+++ b/drivers/net/can/m_can/tcan4x5x-core.c
@@ -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,
--
2.42.0
