linux-kernel - [PATCH 4/7] can: m_can: Support pinctrl wakeup state

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Date: Thu, 23 May 2024 09:53:44 +0200
From: Markus Schneider-Pargmann <msp@...libre.com>
To: Chandrasekar Ramakrishnan <rcsekar@...sung.com>,
	Marc Kleine-Budde <mkl@...gutronix.de>,
	Vincent Mailhol <mailhol.vincent@...adoo.fr>,
	"David S . Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Nishanth Menon <nm@...com>,
	Vignesh Raghavendra <vigneshr@...com>,
	Tero Kristo <kristo@...nel.org>
Cc: Vibhore Vardhan <vibhore@...com>,
	Kevin Hilman <khilman@...libre.com>,
	Dhruva Gole <d-gole@...com>,
	Martin Hundebøll <martin@...nix.com>,
	Simon Horman <horms@...nel.org>,
	linux-can@...r.kernel.org,
	netdev@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Markus Schneider-Pargmann <msp@...libre.com>
Subject: [PATCH 4/7] can: m_can: Support pinctrl wakeup state

am62 requires a wakeup flag being set in pinctrl when mcan pins acts as
a wakeup source. Add support to select the wakeup state if WOL is
enabled.

Signed-off-by: Markus Schneider-Pargmann <msp@...libre.com>
---
 drivers/net/can/m_can/m_can.c | 20 +++++++++++++++++++-
 drivers/net/can/m_can/m_can.h |  4 ++++
 2 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c
index 80964e403a5e..c5585dc68f2f 100644
--- a/drivers/net/can/m_can/m_can.c
+++ b/drivers/net/can/m_can/m_can.c
@@ -2140,11 +2140,21 @@ static void m_can_get_wol(struct net_device *dev, struct ethtool_wolinfo *wol)
 static int m_can_set_wol(struct net_device *dev, struct ethtool_wolinfo *wol)
 {
 	struct m_can_classdev *cdev = netdev_priv(dev);
+	struct pinctrl_state *new_pinctrl_state = NULL;
+	bool wol_enable = !!wol->wolopts & WAKE_PHY;
 
 	if ((wol->wolopts & WAKE_PHY) != wol->wolopts)
 		return -EINVAL;
 
-	device_set_wakeup_enable(cdev->dev, !!wol->wolopts & WAKE_PHY);
+	if (wol_enable)
+		new_pinctrl_state = cdev->pinctrl_state_wakeup;
+	else
+		new_pinctrl_state = cdev->pinctrl_state_default;
+
+	if (!IS_ERR_OR_NULL(new_pinctrl_state))
+		pinctrl_select_state(cdev->pinctrl, new_pinctrl_state);
+
+	device_set_wakeup_enable(cdev->dev, wol_enable);
 
 	return 0;
 }
@@ -2309,6 +2319,14 @@ struct m_can_classdev *m_can_class_allocate_dev(struct device *dev,
 	SET_NETDEV_DEV(net_dev, dev);
 
 	m_can_of_parse_mram(class_dev, mram_config_vals);
+
+	class_dev->pinctrl = devm_pinctrl_get(dev);
+	if (!IS_ERR_OR_NULL(class_dev->pinctrl)) {
+		class_dev->pinctrl_state_default =
+			pinctrl_lookup_state(class_dev->pinctrl, "default");
+		class_dev->pinctrl_state_wakeup =
+			pinctrl_lookup_state(class_dev->pinctrl, "wakeup");
+	}
 out:
 	return class_dev;
 }
diff --git a/drivers/net/can/m_can/m_can.h b/drivers/net/can/m_can/m_can.h
index 3a9edc292593..bdfbba67b336 100644
--- a/drivers/net/can/m_can/m_can.h
+++ b/drivers/net/can/m_can/m_can.h
@@ -126,6 +126,10 @@ struct m_can_classdev {
 	struct mram_cfg mcfg[MRAM_CFG_NUM];
 
 	struct hrtimer hrtimer;
+
+	struct pinctrl *pinctrl;
+	struct pinctrl_state *pinctrl_state_default;
+	struct pinctrl_state *pinctrl_state_wakeup;
 };
 
 struct m_can_classdev *m_can_class_allocate_dev(struct device *dev, int sizeof_priv);
-- 
2.43.0