[PATCH v5 2/2] can: m_can: add ti,am62-mcan compatible with out-of-band wakeup support
From: Kendall Willis <hidden>
Date: 2026-09-12 21:27:36
Also in:
linux-can, lkml
Subsystem:
can network drivers, mcan device driver, the rest · Maintainers:
Marc Kleine-Budde, Vincent Mailhol, Markus Schneider-Pargmann, Linus Torvalds
In TI K3 AM62 SoCs, the M_CAN controllers are in power domains which are OFF in the deepest low power states. However, the m_can pins are able to wakeup the system from states where the power domain is OFF through its out-of-band wakeup functionality. Introduce the ti,am62-mcan 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 <redacted> --- drivers/net/can/m_can/m_can.c | 10 ++++++++-- drivers/net/can/m_can/m_can.h | 6 ++++++ drivers/net/can/m_can/m_can_platform.c | 9 +++++++++ 3 files changed, 23 insertions(+), 2 deletions(-)
diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c
index 16f80607e150e2ca2950616ff2c39b7aa13710b4..67ac6995a7f27c412b61bbe235b4aa0f5980688e 100644
--- a/drivers/net/can/m_can/m_can.c
+++ b/drivers/net/can/m_can/m_can.c@@ -2622,8 +2622,14 @@ int m_can_class_suspend(struct device *dev) cdev->can.state = CAN_STATE_SLEEPING; } - if (!m_can_class_wakeup_pinctrl_enabled(cdev)) - pinctrl_pm_select_sleep_state(dev); + if (!ret) { + if (m_can_class_wakeup_pinctrl_enabled(cdev)) { + if (cdev->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..da64e6bbcef2a721a330e67fd852ca4a703c5794 100644
--- a/drivers/net/can/m_can/m_can.h
+++ b/drivers/net/can/m_can/m_can.h@@ -132,6 +132,12 @@ struct m_can_classdev { struct pinctrl *pinctrl; struct pinctrl_state *pinctrl_state_wakeup; + + bool out_band_wakeup; +}; + +struct m_can_of_data { + bool out_band_wakeup; }; struct m_can_classdev *m_can_class_allocate_dev(struct device *dev, int sizeof_priv);
diff --git a/drivers/net/can/m_can/m_can_platform.c b/drivers/net/can/m_can/m_can_platform.c
index 56da411878af0185ff9cc512e325137428a68255..9deded10e8a6a99eff5ff1a78696f660db443db6 100644
--- a/drivers/net/can/m_can/m_can_platform.c
+++ b/drivers/net/can/m_can/m_can_platform.c@@ -83,6 +83,7 @@ static int m_can_plat_probe(struct platform_device *pdev) void __iomem *addr; void __iomem *mram_addr; struct phy *transceiver; + const struct m_can_of_data *of_data; int irq = 0, ret = 0; mcan_class = m_can_class_allocate_dev(&pdev->dev,
@@ -148,6 +149,9 @@ static int m_can_plat_probe(struct platform_device *pdev) mcan_class->is_peripheral = false; + of_data = of_device_get_match_data(&pdev->dev); + mcan_class->out_band_wakeup = of_data && of_data->out_band_wakeup; + platform_set_drvdata(pdev, mcan_class); pm_runtime_enable(mcan_class->dev);
@@ -218,8 +222,13 @@ 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_of_data 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-mcan", .data = &m_can_plat_am62 }, { /* sentinel */ }, }; MODULE_DEVICE_TABLE(of, m_can_of_table);
--
2.34.1