media: imx7: mipi csis: Create media links in bound notifier

Implement a notifier bound op to register media links from the remote
sub-device's source pad(s) to the mipi csi-2 receiver sink pad.

Signed-off-by: Steve Longerbeam <slongerbeam@gmail.com>
Acked-by: Rui Miguel Silva <rmfrfs@gmail.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

diff --git a/drivers/staging/media/imx/imx7-mipi-csis.c b/drivers/staging/media/imx/imx7-mipi-csis.c
index 2da59d298ccf537ee9d797f58550fcfacc553cc9..7612993cc1d68cfa854fac5c7354d2798bdccef6 100644 (file)
--- a/drivers/staging/media/imx/imx7-mipi-csis.c
+++ b/drivers/staging/media/imx/imx7-mipi-csis.c
@@ -26,6 +26,7 @@
 
 #include <media/v4l2-device.h>
 #include <media/v4l2-fwnode.h>
+#include <media/v4l2-mc.h>
 #include <media/v4l2-subdev.h>
 
 #define CSIS_DRIVER_NAME                       "imx7-mipi-csis"
@@ -385,6 +386,12 @@ static int mipi_csis_dump_regs(struct csi_state *state)
        return 0;
 }
 
+static struct csi_state *
+mipi_notifier_to_csis_state(struct v4l2_async_notifier *n)
+{
+       return container_of(n, struct csi_state, notifier);
+}
+
 static struct csi_state *mipi_sd_to_csis_state(struct v4l2_subdev *sdev)
 {
        return container_of(sdev, struct csi_state, mipi_sd);
@@ -948,6 +955,20 @@ static int mipi_csis_parse_dt(struct platform_device *pdev,
 
 static int mipi_csis_pm_resume(struct device *dev, bool runtime);
 
+static int mipi_csis_notify_bound(struct v4l2_async_notifier *notifier,
+                                 struct v4l2_subdev *sd,
+                                 struct v4l2_async_subdev *asd)
+{
+       struct csi_state *state = mipi_notifier_to_csis_state(notifier);
+       struct media_pad *sink = &state->mipi_sd.entity.pads[CSIS_PAD_SINK];
+
+       return v4l2_create_fwnode_links_to_pad(sd, sink);
+}
+
+static const struct v4l2_async_notifier_operations mipi_csis_notify_ops = {
+       .bound = mipi_csis_notify_bound,
+};
+
 static int mipi_csis_subdev_init(struct v4l2_subdev *mipi_sd,
                                 struct platform_device *pdev,
                                 const struct v4l2_subdev_ops *ops)
@@ -1016,6 +1037,8 @@ static int mipi_csis_async_register(struct csi_state *state)
 
        fwnode_handle_put(ep);
 
+       state->notifier.ops = &mipi_csis_notify_ops;
+
        ret = v4l2_async_subdev_notifier_register(&state->mipi_sd,
                                                  &state->notifier);
        if (ret)