linux-kernel - [PATCH v3 08/17] media: imx: mipi csi-2: Create media links in bound notifier

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Message-Id: <20200204234918.20425-9-slongerbeam@gmail.com>
Date:   Tue,  4 Feb 2020 15:49:09 -0800
From:   Steve Longerbeam <slongerbeam@...il.com>
To:     linux-media@...r.kernel.org, Rui Miguel Silva <rmfrfs@...il.com>,
        Philipp Zabel <p.zabel@...gutronix.de>
Cc:     Steve Longerbeam <slongerbeam@...il.com>,
        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 v3 08/17] media: imx: mipi csi-2: 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@...il.com>
---
Changes in v3:
- call a local imx-media utility imx_media_create_fwnode_pad_link()
  that creates a single link.
---
 drivers/staging/media/imx/imx6-mipi-csi2.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/drivers/staging/media/imx/imx6-mipi-csi2.c b/drivers/staging/media/imx/imx6-mipi-csi2.c
index e27a342751fc..fddf6388348a 100644
--- a/drivers/staging/media/imx/imx6-mipi-csi2.c
+++ b/drivers/staging/media/imx/imx6-mipi-csi2.c
@@ -91,6 +91,11 @@ static inline struct csi2_dev *sd_to_dev(struct v4l2_subdev *sdev)
 	return container_of(sdev, struct csi2_dev, sd);
 }
 
+static inline struct csi2_dev *notifier_to_dev(struct v4l2_async_notifier *n)
+{
+	return container_of(n, struct csi2_dev, notifier);
+}
+
 /*
  * The required sequence of MIPI CSI-2 startup as specified in the i.MX6
  * reference manual is as follows:
@@ -584,6 +589,20 @@ static int csi2_parse_endpoint(struct device *dev,
 	return 0;
 }
 
+static int csi2_notify_bound(struct v4l2_async_notifier *notifier,
+			     struct v4l2_subdev *sd,
+			     struct v4l2_async_subdev *asd)
+{
+	struct csi2_dev *csi2 = notifier_to_dev(notifier);
+	struct media_pad *sink = &csi2->sd.entity.pads[CSI2_SINK_PAD];
+
+	return imx_media_create_fwnode_pad_link(sd, sink);
+}
+
+static const struct v4l2_async_notifier_operations csi2_notify_ops = {
+	.bound = csi2_notify_bound,
+};
+
 static int csi2_probe(struct platform_device *pdev)
 {
 	unsigned int sink_port = 0;
@@ -667,6 +686,8 @@ static int csi2_probe(struct platform_device *pdev)
 
 	v4l2_async_notifier_init(&csi2->notifier);
 
+	csi2->notifier.ops = &csi2_notify_ops;
+
 	ret = v4l2_async_register_fwnode_subdev(
 		&csi2->sd, &csi2->notifier, sizeof(struct v4l2_async_subdev),
 		&sink_port, 1, csi2_parse_endpoint);
-- 
2.17.1