net: pse-pd: add poll path and LED trigger support

index 3beaaaeec9e1..3202c19ef602 100644
@@ -18,6 +18,13 @@
 
 #define PSE_PW_D_LIMIT INT_MAX
 
+/*
+ * Default poll interval for controllers without IRQ support.
+ * 500ms provides a reasonable trade-off between responsiveness
+ * (event detection, PD detection) and I2C bus utilization.
+ */
+#define PSE_DEFAULT_POLL_INTERVAL_MS 500
+
 static DEFINE_MUTEX(pse_list_mutex);
 static LIST_HEAD(pse_controller_list);
 static DEFINE_XARRAY_ALLOC(pse_pw_d_map);

@@ -1114,6 +1121,8 @@ EXPORT_SYMBOL_GPL(pse_controller_register);
  */
 void pse_controller_unregister(struct pse_controller_dev *pcdev)
 {
+	if (pcdev->polling)
+		cancel_delayed_work_sync(&pcdev->poll_work);
 	pse_flush_pw_ds(pcdev);
 	pse_release_pis(pcdev);
 	if (pcdev->irq)

@@ -1238,66 +1247,103 @@ static int pse_set_config_isr(struct pse_controller_dev *pcdev, int id,
 }
 
 /**
- * pse_isr - IRQ handler for PSE
- * @irq: irq number
- * @data: pointer to user interrupt structure
+ * pse_handle_events - Process PSE events for all PIs
+ * @pcdev: a pointer to the PSE controller device
+ * @notifs: per-PI notification array
+ * @notifs_mask: bitmask of PIs with events
  *
- * Return: irqreturn_t - status of IRQ
+ * Common event handling shared between IRQ and poll paths.
+ * Caller must hold pcdev->lock.
  */
-static irqreturn_t pse_isr(int irq, void *data)
+static void pse_handle_events(struct pse_controller_dev *pcdev,
+			      unsigned long *notifs,
+			      unsigned long notifs_mask)
 {
-	struct pse_controller_dev *pcdev;
-	unsigned long notifs_mask = 0;
-	struct pse_irq_desc *desc;
-	struct pse_irq *h = data;
-	int ret, i;
-
-	desc = &h->desc;
-	pcdev = h->pcdev;
-
-	/* Clear notifs mask */
-	memset(h->notifs, 0, pcdev->nr_lines * sizeof(*h->notifs));
-	mutex_lock(&pcdev->lock);
-	ret = desc->map_event(irq, pcdev, h->notifs, &notifs_mask);
-	if (ret || !notifs_mask) {
-		mutex_unlock(&pcdev->lock);
-		return IRQ_NONE;
-	}
+	int i;
 
 	for_each_set_bit(i, &notifs_mask, pcdev->nr_lines) {
-		unsigned long notifs, rnotifs;
+		unsigned long pi_notifs, rnotifs;
 		struct pse_ntf ntf = {};
+		int ret;
 
 		/* Do nothing PI not described */
 		if (!pcdev->pi[i].rdev)
 			continue;
 
-		notifs = h->notifs[i];
+		pi_notifs = notifs[i];
 		if (pse_pw_d_is_sw_pw_control(pcdev, pcdev->pi[i].pw_d)) {
-			ret = pse_set_config_isr(pcdev, i, notifs);
+			ret = pse_set_config_isr(pcdev, i, pi_notifs);
 			if (ret)
-				notifs |= ETHTOOL_PSE_EVENT_SW_PW_CONTROL_ERROR;
+				pi_notifs |= ETHTOOL_PSE_EVENT_SW_PW_CONTROL_ERROR;
 		}
 
-		dev_dbg(h->pcdev->dev,
-			"Sending PSE notification EVT 0x%lx\n", notifs);
+		dev_dbg(pcdev->dev,
+			"Sending PSE notification EVT 0x%lx\n", pi_notifs);
 
-		ntf.notifs = notifs;
+		ntf.notifs = pi_notifs;
 		ntf.id = i;
 		kfifo_in_spinlocked(&pcdev->ntf_fifo, &ntf, 1,
 				    &pcdev->ntf_fifo_lock);
 		schedule_work(&pcdev->ntf_work);
 
-		rnotifs = pse_to_regulator_notifs(notifs);
+		rnotifs = pse_to_regulator_notifs(pi_notifs);
 		regulator_notifier_call_chain(pcdev->pi[i].rdev, rnotifs,
 					      NULL);
 	}
+}
+
+/**
+ * pse_isr - IRQ handler for PSE
+ * @irq: irq number
+ * @data: pointer to user interrupt structure
+ *
+ * Return: irqreturn_t - status of IRQ
+ */
+static irqreturn_t pse_isr(int irq, void *data)
+{
+	struct pse_controller_dev *pcdev;
+	unsigned long notifs_mask = 0;
+	struct pse_irq *h = data;
+	int ret;
 
+	pcdev = h->pcdev;
+
+	/* Clear notifs mask */
+	memset(h->notifs, 0, pcdev->nr_lines * sizeof(*h->notifs));
+	mutex_lock(&pcdev->lock);
+	ret = h->desc.map_event(irq, pcdev, h->notifs, &notifs_mask);
+	if (ret || !notifs_mask) {
+		mutex_unlock(&pcdev->lock);
+		return IRQ_NONE;
+	}
+
+	pse_handle_events(pcdev, h->notifs, notifs_mask);
 	mutex_unlock(&pcdev->lock);
 
 	return IRQ_HANDLED;
 }
 
+static void pse_poll_worker(struct work_struct *work)
+{
+	struct pse_controller_dev *pcdev =
+		container_of(work, struct pse_controller_dev,
+			     poll_work.work);
+	unsigned long notifs_mask = 0;
+	int ret;
+
+	memset(pcdev->poll_notifs, 0,
+	       pcdev->nr_lines * sizeof(*pcdev->poll_notifs));
+	mutex_lock(&pcdev->lock);
+	ret = pcdev->poll_desc.map_event(0, pcdev, pcdev->poll_notifs,
+					 &notifs_mask);
+	if (!ret && notifs_mask)
+		pse_handle_events(pcdev, pcdev->poll_notifs, notifs_mask);
+	mutex_unlock(&pcdev->lock);
+
+	schedule_delayed_work(&pcdev->poll_work,
+			      msecs_to_jiffies(pcdev->poll_interval_ms));
+}
+
 /**
  * devm_pse_irq_helper - Register IRQ based PSE event notifier
  * @pcdev: a pointer to the PSE

@@ -1351,6 +1397,48 @@ int devm_pse_irq_helper(struct pse_controller_dev *pcdev, int irq,
 }
 EXPORT_SYMBOL_GPL(devm_pse_irq_helper);
 
+/**
+ * devm_pse_poll_helper - Register poll-based PSE event notifier
+ * @pcdev: a pointer to the PSE controller device
+ * @d: PSE event description (uses same pse_irq_desc as IRQ path)
+ *
+ * For PSE controllers without IRQ support or with IRQ not wired. Sets
+ * up a delayed work that periodically calls the driver's map_event
+ * callback to detect state changes, feeding events into the standard
+ * notification pipeline.
+ *
+ * Return: 0 on success and errno on failure
+ */
+int devm_pse_poll_helper(struct pse_controller_dev *pcdev,
+			 const struct pse_irq_desc *d)
+{
+	struct device *dev = pcdev->dev;
+
+	if (!d || !d->map_event || !d->name)
+		return -EINVAL;
+
+	pcdev->poll_desc = *d;
+	pcdev->poll_notifs = devm_kcalloc(dev, pcdev->nr_lines,
+					  sizeof(*pcdev->poll_notifs),
+					  GFP_KERNEL);
+	if (!pcdev->poll_notifs)
+		return -ENOMEM;
+
+	of_property_read_u32(dev->of_node, "poll-interval-ms",
+			     &pcdev->poll_interval_ms);
+	if (!pcdev->poll_interval_ms)
+		pcdev->poll_interval_ms = PSE_DEFAULT_POLL_INTERVAL_MS;
+
+	INIT_DELAYED_WORK(&pcdev->poll_work, pse_poll_worker);
+	pcdev->polling = true;
+
+	schedule_delayed_work(&pcdev->poll_work,
+			      msecs_to_jiffies(pcdev->poll_interval_ms));
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(devm_pse_poll_helper);
+
 /* PSE control section */
 
 static void __pse_control_release(struct kref *kref)

index 4e5696cfade7..44d5d10e239d 100644
@@ -292,6 +292,11 @@ struct pse_ntf {
  * @pi: table of PSE PIs described in this controller device
  * @no_of_pse_pi: flag set if the pse_pis devicetree node is not used
  * @irq: PSE interrupt
+ * @polling: flag indicating poll-based event detection is active
+ * @poll_interval_ms: poll interval in milliseconds
+ * @poll_work: delayed work for poll-based event detection
+ * @poll_desc: copy of the driver's event descriptor for polling
+ * @poll_notifs: per-PI notification scratch space for poll worker
  * @pis_prio_max: Maximum value allowed for the PSE PIs priority
  * @supp_budget_eval_strategies: budget evaluation strategies supported
  *				 by the PSE

@@ -312,6 +317,11 @@ struct pse_controller_dev {
 	struct pse_pi *pi;
 	bool no_of_pse_pi;
 	int irq;
+	bool polling;
+	unsigned int poll_interval_ms;
+	struct delayed_work poll_work;
+	struct pse_irq_desc poll_desc;
+	unsigned long *poll_notifs;
 	unsigned int pis_prio_max;
 	u32 supp_budget_eval_strategies;
 	struct work_struct ntf_work;

@@ -345,6 +355,8 @@ int devm_pse_controller_register(struct device *dev,
 				 struct pse_controller_dev *pcdev);
 int devm_pse_irq_helper(struct pse_controller_dev *pcdev, int irq,
 			int irq_flags, const struct pse_irq_desc *d);
+int devm_pse_poll_helper(struct pse_controller_dev *pcdev,
+			 const struct pse_irq_desc *d);
 
 struct pse_control *of_pse_control_get(struct device_node *node,
 				       struct phy_device *phydev);

index 3202c19ef602..0e96c22493a4 100644
@@ -12,6 +12,7 @@
 #include <linux/phy.h>
 #include <linux/pse-pd/pse.h>
 #include <linux/regulator/driver.h>
+#include <linux/leds.h>
 #include <linux/regulator/machine.h>
 #include <linux/rtnetlink.h>
 #include <net/net_trackers.h>

@@ -1037,6 +1038,107 @@ static void pse_send_ntf_worker(struct work_struct *work)
 	}
 }
 
+#if IS_ENABLED(CONFIG_LEDS_TRIGGERS)
+/**
+ * pse_led_update - Update LED triggers for a PI based on current state
+ * @pcdev: PSE controller device
+ * @id: PI index
+ *
+ * Queries the current power status and admin state of the PI and
+ * fires LED trigger events on state changes. Called from the
+ * notification path whenever any event occurs for this PI.
+ *
+ * Must be called with pcdev->lock held.
+ */
+static void pse_led_update(struct pse_controller_dev *pcdev, int id)
+{
+	struct pse_pi_led_triggers *trigs;
+	struct pse_pw_status pw_status = {};
+	struct pse_admin_state admin_state = {};
+	bool delivering, enabled;
+
+	if (!pcdev->pi_led_trigs)
+		return;
+
+	trigs = &pcdev->pi_led_trigs[id];
+	if (!trigs->delivering.name)
+		return;
+
+	if (pcdev->ops->pi_get_pw_status(pcdev, id, &pw_status))
+		return;
+	if (pcdev->ops->pi_get_admin_state(pcdev, id, &admin_state))
+		return;
+
+	delivering = pw_status.c33_pw_status ==
+		ETHTOOL_C33_PSE_PW_D_STATUS_DELIVERING;
+	enabled = admin_state.c33_admin_state ==
+		ETHTOOL_C33_PSE_ADMIN_STATE_ENABLED;
+
+	if (trigs->last_delivering != delivering) {
+		trigs->last_delivering = delivering;
+		led_trigger_event(&trigs->delivering,
+				  delivering ? LED_FULL : LED_OFF);
+	}
+
+	if (trigs->last_enabled != enabled) {
+		trigs->last_enabled = enabled;
+		led_trigger_event(&trigs->enabled,
+				  enabled ? LED_FULL : LED_OFF);
+	}
+}
+
+static int pse_led_triggers_register(struct pse_controller_dev *pcdev)
+{
+	struct device *dev = pcdev->dev;
+	const char *node_name;
+	int i, ret;
+
+	node_name = dev->of_node ? dev->of_node->name : dev_name(dev);
+
+	pcdev->pi_led_trigs = devm_kcalloc(dev, pcdev->nr_lines,
+					   sizeof(*pcdev->pi_led_trigs),
+					   GFP_KERNEL);
+	if (!pcdev->pi_led_trigs)
+		return -ENOMEM;
+
+	for (i = 0; i < pcdev->nr_lines; i++) {
+		struct pse_pi_led_triggers *trigs = &pcdev->pi_led_trigs[i];
+
+		/* Skip PIs not described in device tree */
+		if (!pcdev->no_of_pse_pi && !pcdev->pi[i].np)
+			continue;
+
+		trigs->delivering.name = devm_kasprintf(dev, GFP_KERNEL,
+							"%s:port%d:delivering",
+							node_name, i);
+		if (!trigs->delivering.name)
+			return -ENOMEM;
+
+		ret = devm_led_trigger_register(dev, &trigs->delivering);
+		if (ret)
+			return ret;
+
+		trigs->enabled.name = devm_kasprintf(dev, GFP_KERNEL,
+						     "%s:port%d:enabled",
+						     node_name, i);
+		if (!trigs->enabled.name)
+			return -ENOMEM;
+
+		ret = devm_led_trigger_register(dev, &trigs->enabled);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+#else
+static inline void pse_led_update(struct pse_controller_dev *pcdev, int id) {}
+static int pse_led_triggers_register(struct pse_controller_dev *pcdev)
+{
+	return 0;
+}
+#endif /* CONFIG_LEDS_TRIGGERS */
+
 /**
  * pse_controller_register - register a PSE controller device
  * @pcdev: a pointer to the initialized PSE controller device

@@ -1111,6 +1213,14 @@ int pse_controller_register(struct pse_controller_dev *pcdev)
 	list_add(&pcdev->list, &pse_controller_list);
 	mutex_unlock(&pse_list_mutex);
 
+	ret = pse_led_triggers_register(pcdev);
+	if (ret) {
+		dev_warn(pcdev->dev, "Failed to register LED triggers: %d\n",
+			 ret);
+		/* Ensure pse_led_update() is a no-op on partial failure */
+		pcdev->pi_led_trigs = NULL;
+	}
+
 	return 0;
 }
 EXPORT_SYMBOL_GPL(pse_controller_register);

@@ -1266,7 +1376,14 @@ static void pse_handle_events(struct pse_controller_dev *pcdev,
 		struct pse_ntf ntf = {};
 		int ret;
 
-		/* Do nothing PI not described */
+		/* Update LEDs for described PIs regardless of consumer state.
+		 * LED triggers are registered at controller init, before any
+		 * PHY claims a PSE control, so rdev may still be NULL here.
+		 */
+		if (pcdev->no_of_pse_pi || pcdev->pi[i].np)
+			pse_led_update(pcdev, i);
+
+		/* Skip regulator/netlink path for PIs without consumers */
 		if (!pcdev->pi[i].rdev)
 			continue;
 

index 44d5d10e239d..0058636a6299 100644
@@ -10,6 +10,7 @@
 #include <linux/kfifo.h>
 #include <uapi/linux/ethtool.h>
 #include <uapi/linux/ethtool_netlink_generated.h>
+#include <linux/leds.h>
 #include <linux/regulator/driver.h>
 
 /* Maximum current in uA according to IEEE 802.3-2022 Table 145-1 */

@@ -266,6 +267,23 @@ struct pse_pi {
 	int pw_allocated_mW;
 };
 
+#if IS_ENABLED(CONFIG_LEDS_TRIGGERS)
+/**
+ * struct pse_pi_led_triggers - LED trigger state for a PSE PI
+ *
+ * @delivering: LED trigger for power delivering state
+ * @enabled: LED trigger for admin enabled state
+ * @last_delivering: cached delivering state for change detection
+ * @last_enabled: cached enabled state for change detection
+ */
+struct pse_pi_led_triggers {
+	struct led_trigger delivering;
+	struct led_trigger enabled;
+	bool last_delivering;
+	bool last_enabled;
+};
+#endif
+
 /**
  * struct pse_ntf - PSE notification element
  *

@@ -303,6 +321,7 @@ struct pse_ntf {
  * @ntf_work: workqueue for PSE notification management
  * @ntf_fifo: PSE notifications FIFO
  * @ntf_fifo_lock: protect @ntf_fifo writer
+ * @pi_led_trigs: per-PI LED trigger state array
  */
 struct pse_controller_dev {
 	const struct pse_controller_ops *ops;

@@ -327,6 +346,9 @@ struct pse_controller_dev {
 	struct work_struct ntf_work;
 	DECLARE_KFIFO_PTR(ntf_fifo, struct pse_ntf);
 	spinlock_t ntf_fifo_lock; /* Protect @ntf_fifo writer */
+#if IS_ENABLED(CONFIG_LEDS_TRIGGERS)
+	struct pse_pi_led_triggers *pi_led_trigs;
+#endif
 };
 
 /**