diff --git a/drivers/hwmon/pmbus/adm1266.c b/drivers/hwmon/pmbus/adm1266.c
index aa353b6b9c99..0ef8a6ccd919 100644
--- a/drivers/hwmon/pmbus/adm1266.c
+++ b/drivers/hwmon/pmbus/adm1266.c
@@ -28,6 +28,7 @@
 #define ADM1266_READ_BLACKBOX	0xDE
 #define ADM1266_SET_RTC		0xDF
 #define ADM1266_GPIO_CONFIG	0xE1
+#define ADM1266_POWERUP_COUNTER	0xE4
 #define ADM1266_BLACKBOX_INFO	0xE6
 #define ADM1266_PDIO_STATUS	0xE9
 #define ADM1266_GPIO_STATUS	0xEA
@@ -371,6 +372,32 @@ static int adm1266_firmware_revision_read(struct seq_file *s, void *pdata)
 	return 0;
 }
 
+/*
+ * POWERUP_COUNTER (0xE4) is a 2-byte little-endian non-volatile counter
+ * that increments on every device power cycle (datasheet Rev. D, Table
+ * 93). It saturates at 65535 and cannot be reset by the host. Each
+ * blackbox record embeds the counter value at record time, so this live
+ * read is mainly useful for matching a record back to its boot.
+ */
+static int adm1266_powerup_counter_read(struct seq_file *s, void *pdata)
+{
+	struct device *dev = s->private;
+	struct i2c_client *client = to_i2c_client(dev);
+	u8 buf[I2C_SMBUS_BLOCK_MAX];
+	int ret;
+
+	guard(pmbus_lock)(client);
+	ret = i2c_smbus_read_block_data(client, ADM1266_POWERUP_COUNTER, buf);
+	if (ret < 0)
+		return ret;
+	if (ret != 2)
+		return -EIO;
+
+	seq_printf(s, "%u\n", buf[0] | (buf[1] << 8));
+
+	return 0;
+}
+
 /*
  * Clearing the blackbox is required when the device is configured in
  * single-recording mode (BLACKBOX_CONFIG[0] = 0): once the 32-record
@@ -419,6 +446,8 @@ static void adm1266_init_debugfs(struct adm1266_data *data)
 				    adm1266_state_read);
 	debugfs_create_devm_seqfile(&data->client->dev, "firmware_revision", data->debugfs_dir,
 				    adm1266_firmware_revision_read);
+	debugfs_create_devm_seqfile(&data->client->dev, "powerup_counter", data->debugfs_dir,
+				    adm1266_powerup_counter_read);
 	debugfs_create_file("clear_blackbox", 0200, data->debugfs_dir, data->client,
 			    &adm1266_clear_blackbox_fops);
 }