linux-kernel - [PATCH 18/22] media: imx: csi: Create media links in bound notifier

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Message-Id: <20190805233505.21167-19-slongerbeam@gmail.com>
Date:   Mon,  5 Aug 2019 16:35:01 -0700
From:   Steve Longerbeam <slongerbeam@...il.com>
To:     linux-media@...r.kernel.org
Cc:     Steve Longerbeam <slongerbeam@...il.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        devel@...verdev.osuosl.org (open list:STAGING SUBSYSTEM),
        linux-arm-kernel@...ts.infradead.org (moderated list:ARM/FREESCALE IMX
        / MXC ARM ARCHITECTURE), linux-kernel@...r.kernel.org (open list)
Subject: [PATCH 18/22] media: imx: csi: 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 CSI sink pad.

Signed-off-by: Steve Longerbeam <slongerbeam@...il.com>
---
 drivers/staging/media/imx/imx-media-csi.c | 24 +++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/drivers/staging/media/imx/imx-media-csi.c b/drivers/staging/media/imx/imx-media-csi.c
index b39d79e63ac2..37b10cbf3c1a 100644
--- a/drivers/staging/media/imx/imx-media-csi.c
+++ b/drivers/staging/media/imx/imx-media-csi.c
@@ -120,6 +120,11 @@ static inline struct csi_priv *sd_to_dev(struct v4l2_subdev *sdev)
 	return container_of(sdev, struct csi_priv, sd);
 }
 
+static inline struct csi_priv *notifier_to_dev(struct v4l2_async_notifier *n)
+{
+	return container_of(n, struct csi_priv, notifier);
+}
+
 static inline bool is_parallel_bus(struct v4l2_fwnode_endpoint *ep)
 {
 	return ep->bus_type != V4L2_MBUS_CSI2_DPHY;
@@ -1895,6 +1900,23 @@ static int imx_csi_parse_endpoint(struct device *dev,
 	return fwnode_device_is_available(asd->match.fwnode) ? 0 : -ENOTCONN;
 }
 
+static int imx_csi_notify_bound(struct v4l2_async_notifier *notifier,
+				struct v4l2_subdev *sd,
+				struct v4l2_async_subdev *asd)
+{
+	struct csi_priv *priv = notifier_to_dev(notifier);
+	struct media_pad *sink = &priv->sd.entity.pads[CSI_SINK_PAD];
+
+	return media_create_fwnode_pad_links(sink,
+					     dev_fwnode(priv->dev->parent),
+					     &sd->entity,
+					     dev_fwnode(sd->dev), 0);
+}
+
+static const struct v4l2_async_notifier_operations csi_notify_ops = {
+	.bound = imx_csi_notify_bound,
+};
+
 static int imx_csi_async_register(struct csi_priv *priv)
 {
 	struct fwnode_handle *fwnode;
@@ -1903,6 +1925,8 @@ static int imx_csi_async_register(struct csi_priv *priv)
 
 	v4l2_async_notifier_init(&priv->notifier);
 
+	priv->notifier.ops = &csi_notify_ops;
+
 	fwnode = dev_fwnode(priv->dev);
 
 	/* get this CSI's port id */
-- 
2.17.1