[PATCH v4 2/2] can: m_can: add ti,am62-m_can compatible with out-of-band wakeup support

[Kendall Willis]

In TI AM62X, AM62A, and AM62P SoCs, the M_CAN controller is a part of
the MCU power domain which is OFF in the deepest low power states.
However, the m_can pins are able to wakeup the system from states where
the MCU domain is OFF through its out-of-band wakeup functionality.

Introduce the ti,am62-m_can compatible with match data to identify the
out-of-band wakeup capability for TI AM62 SoCs. During suspend, set the
out-of-band wakeup flag when the device is configured as a wakeup
source, the "wakeup" pinctrl state is present, and the match data
indicates out-of-band wakeup support.

Signed-off-by: Kendall Willis <k-willis@xxxxxx>
---
 drivers/net/can/m_can/m_can.c          | 7 ++++++-
 drivers/net/can/m_can/m_can.h          | 4 ++++
 drivers/net/can/m_can/m_can_platform.c | 5 +++++
 3 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c
index 16f80607e150e2ca2950616ff2c39b7aa13710b4..0788816d881ef8ba84ad5a84a6d2d3e60517ea7a 100644
--- a/drivers/net/can/m_can/m_can.c
+++ b/drivers/net/can/m_can/m_can.c
@@ -2598,6 +2598,7 @@ int m_can_class_suspend(struct device *dev)
 {
 	struct m_can_classdev *cdev = dev_get_drvdata(dev);
 	struct net_device *ndev = cdev->net;
+	const struct m_can_pdata *pdata = of_device_get_match_data(dev);
 	int ret = 0;
 
 	if (netif_running(ndev)) {
@@ -2622,8 +2623,12 @@ int m_can_class_suspend(struct device *dev)
 		cdev->can.state = CAN_STATE_SLEEPING;
 	}
 
-	if (!m_can_class_wakeup_pinctrl_enabled(cdev))
+	if (m_can_class_wakeup_pinctrl_enabled(cdev)) {
+		if (pdata && pdata->out_band_wakeup)
+			device_set_out_band_wakeup(dev);
+	} else {
 		pinctrl_pm_select_sleep_state(dev);
+	}
 
 	return ret;
 }
diff --git a/drivers/net/can/m_can/m_can.h b/drivers/net/can/m_can/m_can.h
index 4743342b2fba3823819b9e2bc5b085cc0fe6d1e2..486d808bc677482acf446b1450c3a9b6b7405178 100644
--- a/drivers/net/can/m_can/m_can.h
+++ b/drivers/net/can/m_can/m_can.h
@@ -134,6 +134,10 @@ struct m_can_classdev {
 	struct pinctrl_state *pinctrl_state_wakeup;
 };
 
+struct m_can_pdata {
+	bool out_band_wakeup;
+};
+
 struct m_can_classdev *m_can_class_allocate_dev(struct device *dev, int sizeof_priv);
 void m_can_class_free_dev(struct net_device *net);
 int m_can_class_register(struct m_can_classdev *cdev);
diff --git a/drivers/net/can/m_can/m_can_platform.c b/drivers/net/can/m_can/m_can_platform.c
index 56da411878af0185ff9cc512e325137428a68255..ae2d89b65fe8da65b1ca73cbf80cd8ee8483e2e8 100644
--- a/drivers/net/can/m_can/m_can_platform.c
+++ b/drivers/net/can/m_can/m_can_platform.c
@@ -218,8 +218,13 @@ static const struct dev_pm_ops m_can_pmops = {
 	SET_SYSTEM_SLEEP_PM_OPS(m_can_suspend, m_can_resume)
 };
 
+static const struct m_can_pdata m_can_plat_am62 = {
+	.out_band_wakeup = true,
+};
+
 static const struct of_device_id m_can_of_table[] = {
 	{ .compatible = "bosch,m_can", .data = NULL },
+	{ .compatible = "ti,am62-m_can", .data = &m_can_plat_am62 },
 	{ /* sentinel */ },
 };
 MODULE_DEVICE_TABLE(of, m_can_of_table);

-- 
2.34.1