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path: root/drivers/fpga/dfl.c
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Diffstat (limited to 'drivers/fpga/dfl.c')
-rw-r--r--drivers/fpga/dfl.c32
1 files changed, 32 insertions, 0 deletions
diff --git a/drivers/fpga/dfl.c b/drivers/fpga/dfl.c
index b56933c64371..68e0b45617b2 100644
--- a/drivers/fpga/dfl.c
+++ b/drivers/fpga/dfl.c
@@ -813,6 +813,38 @@ void dfl_fpga_feature_devs_remove(struct dfl_fpga_cdev *cdev)
}
EXPORT_SYMBOL_GPL(dfl_fpga_feature_devs_remove);
+/**
+ * __dfl_fpga_cdev_find_port - find a port under given container device
+ *
+ * @cdev: container device
+ * @data: data passed to match function
+ * @match: match function used to find specific port from the port device list
+ *
+ * Find a port device under container device. This function needs to be
+ * invoked with lock held.
+ *
+ * Return: pointer to port's platform device if successful, NULL otherwise.
+ *
+ * NOTE: you will need to drop the device reference with put_device() after use.
+ */
+struct platform_device *
+__dfl_fpga_cdev_find_port(struct dfl_fpga_cdev *cdev, void *data,
+ int (*match)(struct platform_device *, void *))
+{
+ struct dfl_feature_platform_data *pdata;
+ struct platform_device *port_dev;
+
+ list_for_each_entry(pdata, &cdev->port_dev_list, node) {
+ port_dev = pdata->dev;
+
+ if (match(port_dev, data) && get_device(&port_dev->dev))
+ return port_dev;
+ }
+
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(__dfl_fpga_cdev_find_port);
+
static int __init dfl_fpga_init(void)
{
int ret;