fpga: dfl: add dfl_fpga_cdev_find_port
For feature devices, we need a method to find the port dedicated
to the device. This patch adds a function dfl_fpga_cdev_find_port
for this purpose. e.g. FPGA Management Engine (FME) Partial
Reconfiguration sub feature, it uses this function to find
dedicated port on the device for PR function implementation.
Signed-off-by: Tim Whisonant <tim.whisonant@intel.com>
Signed-off-by: Enno Luebbers <enno.luebbers@intel.com>
Signed-off-by: Shiva Rao <shiva.rao@intel.com>
Signed-off-by: Christopher Rauer <christopher.rauer@intel.com>
Signed-off-by: Xiao Guangrong <guangrong.xiao@linux.intel.com>
Signed-off-by: Wu Hao <hao.wu@intel.com>
Acked-by: Alan Tull <atull@kernel.org>
Acked-by: Moritz Fischer <mdf@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/fpga/dfl.h b/drivers/fpga/dfl.h
index 66c2ade..b4f6525 100644
--- a/drivers/fpga/dfl.h
+++ b/drivers/fpga/dfl.h
@@ -284,4 +284,25 @@ struct dfl_fpga_cdev *
dfl_fpga_feature_devs_enumerate(struct dfl_fpga_enum_info *info);
void dfl_fpga_feature_devs_remove(struct dfl_fpga_cdev *cdev);
+/*
+ * need to drop the device reference with put_device() after use port platform
+ * device returned by __dfl_fpga_cdev_find_port and dfl_fpga_cdev_find_port
+ * functions.
+ */
+struct platform_device *
+__dfl_fpga_cdev_find_port(struct dfl_fpga_cdev *cdev, void *data,
+ int (*match)(struct platform_device *, void *));
+
+static inline struct platform_device *
+dfl_fpga_cdev_find_port(struct dfl_fpga_cdev *cdev, void *data,
+ int (*match)(struct platform_device *, void *))
+{
+ struct platform_device *pdev;
+
+ mutex_lock(&cdev->lock);
+ pdev = __dfl_fpga_cdev_find_port(cdev, data, match);
+ mutex_unlock(&cdev->lock);
+
+ return pdev;
+}
#endif /* __FPGA_DFL_H */