linux-kernel - [PATCH v3 09/17] media: imx7-mipi-csis: Create media links in bound notifier

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Message-Id: <20200204234918.20425-10-slongerbeam@gmail.com>
Date:   Tue,  4 Feb 2020 15:49:10 -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 09/17] 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@...il.com>
---
Changes in v3:
- call a local imx-media utility imx_media_create_fwnode_pad_link().
Changes in v2:
- Move notifier_to_csis_state() next to mipi_sd_to_csis_state(), remove
  unnecessary inline, and rename to mipi_notifier_to_csis_state().
  Suggested by Rui Silva.
---
 drivers/staging/media/imx/imx7-mipi-csis.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/drivers/staging/media/imx/imx7-mipi-csis.c b/drivers/staging/media/imx/imx7-mipi-csis.c
index 4c54456318ea..d3a83577efed 100644
--- a/drivers/staging/media/imx/imx7-mipi-csis.c
+++ b/drivers/staging/media/imx/imx7-mipi-csis.c
@@ -317,6 +317,12 @@ 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);
@@ -848,6 +854,20 @@ static int mipi_csis_parse_endpoint(struct device *dev,
 	return 0;
 }
 
+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 imx_media_create_fwnode_pad_link(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)
@@ -886,6 +906,8 @@ static int mipi_csis_subdev_init(struct v4l2_subdev *mipi_sd,
 
 	v4l2_async_notifier_init(&state->notifier);
 
+	state->notifier.ops = &mipi_csis_notify_ops;
+
 	ret = v4l2_async_register_fwnode_subdev(mipi_sd, &state->notifier,
 						sizeof(struct v4l2_async_subdev),
 						&sink_port, 1,
-- 
2.17.1