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Message-Id: <20241015-topic-mcan-wakeup-source-v6-12-v4-5-fdac1d1e7aa6@baylibre.com>
Date: Tue, 15 Oct 2024 21:15:59 +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 <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>, Nishanth Menon <nm@...com>,
Vignesh Raghavendra <vigneshr@...com>, Tero Kristo <kristo@...nel.org>
Cc: linux-can@...r.kernel.org, netdev@...r.kernel.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org,
Matthias Schiffer <matthias.schiffer@...tq-group.com>,
Vishal Mahaveer <vishalm@...com>, Kevin Hilman <khilman@...libre.com>,
Dhruva Gole <d-gole@...com>, Simon Horman <horms@...nel.org>,
Vincent MAILHOL <mailhol.vincent@...adoo.fr>,
Markus Schneider-Pargmann <msp@...libre.com>
Subject: [PATCH v4 5/9] 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 | 68 +++++++++++++++++++++++++++++++++++++++++++
drivers/net/can/m_can/m_can.h | 4 +++
2 files changed, 72 insertions(+)
diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c
index 5a4e0ad07e9ecc82de5f1f606707f3380d3679fc..c539375005f71c88fd1f7d1a885ce890ce0e9327 100644
--- a/drivers/net/can/m_can/m_can.c
+++ b/drivers/net/can/m_can/m_can.c
@@ -2196,6 +2196,7 @@ 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);
int ret;
@@ -2212,7 +2213,28 @@ static int m_can_set_wol(struct net_device *dev, struct ethtool_wolinfo *wol)
return ret;
}
+ 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))
+ return 0;
+
+ ret = pinctrl_select_state(cdev->pinctrl, new_pinctrl_state);
+ if (ret) {
+ netdev_err(cdev->net, "Failed to select pinctrl state %pE\n",
+ ERR_PTR(ret));
+ goto err_wakeup_enable;
+ }
+
return 0;
+
+err_wakeup_enable:
+ /* Revert wakeup enable */
+ device_set_wakeup_enable(cdev->dev, !wol_enable);
+
+ return ret;
}
static const struct ethtool_ops m_can_ethtool_ops_coalescing = {
@@ -2340,6 +2362,44 @@ int m_can_class_get_clocks(struct m_can_classdev *cdev)
}
EXPORT_SYMBOL_GPL(m_can_class_get_clocks);
+static int m_can_class_setup_optional_pinctrl(struct m_can_classdev *class_dev)
+{
+ struct device *dev = class_dev->dev;
+ int ret;
+
+ class_dev->pinctrl = devm_pinctrl_get(dev);
+ if (IS_ERR(class_dev->pinctrl)) {
+ ret = PTR_ERR(class_dev->pinctrl);
+ class_dev->pinctrl = NULL;
+
+ if (ret == -ENODEV)
+ return 0;
+
+ return dev_err_probe(dev, ret, "Failed to get pinctrl\n");
+ }
+
+ class_dev->pinctrl_state_wakeup =
+ pinctrl_lookup_state(class_dev->pinctrl, "wakeup");
+ if (IS_ERR(class_dev->pinctrl_state_wakeup)) {
+ ret = PTR_ERR(class_dev->pinctrl_state_wakeup);
+ class_dev->pinctrl_state_wakeup = NULL;
+
+ if (ret == -ENODEV)
+ return 0;
+
+ return dev_err_probe(dev, ret, "Failed to lookup pinctrl wakeup state\n");
+ }
+
+ class_dev->pinctrl_state_default =
+ pinctrl_lookup_state(class_dev->pinctrl, "default");
+ if (IS_ERR(class_dev->pinctrl_state_default)) {
+ ret = PTR_ERR(class_dev->pinctrl_state_default);
+ return dev_err_probe(dev, ret, "Failed to lookup pinctrl default state\n");
+ }
+
+ return 0;
+}
+
struct m_can_classdev *m_can_class_allocate_dev(struct device *dev,
int sizeof_priv)
{
@@ -2380,7 +2440,15 @@ struct m_can_classdev *m_can_class_allocate_dev(struct device *dev,
m_can_of_parse_mram(class_dev, mram_config_vals);
+ ret = m_can_class_setup_optional_pinctrl(class_dev);
+ if (ret)
+ goto err_free_candev;
+
return class_dev;
+
+err_free_candev:
+ free_candev(net_dev);
+ return ERR_PTR(ret);
}
EXPORT_SYMBOL_GPL(m_can_class_allocate_dev);
diff --git a/drivers/net/can/m_can/m_can.h b/drivers/net/can/m_can/m_can.h
index 92b2bd8628e6b31370f4accbc2e28f3b2257a71d..b75b0dd6ccc93973d0891daac07c92b61f81dc2a 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);
--
2.45.2
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