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From:   Jai Luthra <j-luthra@ti.com>
To:     Mauro Carvalho Chehab <mchehab@kernel.org>,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Conor Dooley <conor+dt@kernel.org>,
        Sakari Ailus <sakari.ailus@linux.intel.com>,
        Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
        Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
CC:     <linux-media@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        <devicetree@vger.kernel.org>,
        <linux-arm-kernel@lists.infradead.org>,
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        Vaishnav Achath <vaishnav.a@ti.com>,
        Vignesh Raghavendra <vigneshr@ti.com>, <nm@ti.com>,
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Subject: [PATCH v8 13/16] media: cadence: csi2rx: Add link validation
Date:   Mon, 31 Jul 2023 13:59:31 +0530
Message-ID: <20230731-upstream_csi-v8-13-fb7d3661c2c9@ti.com>
In-Reply-To: <20230731-upstream_csi-v8-0-fb7d3661c2c9@ti.com>
References: <20230731-upstream_csi-v8-0-fb7d3661c2c9@ti.com>
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From: Pratyush Yadav <p.yadav@ti.com>

Add media link validation to make sure incorrectly configured pipelines
are caught.

Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
Signed-off-by: Jai Luthra <j-luthra@ti.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
---
v7->v8: No change

 drivers/media/platform/cadence/cdns-csi2rx.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/media/platform/cadence/cdns-csi2rx.c b/drivers/media/platform/cadence/cdns-csi2rx.c
index d82a8938932f..aec33d28a66f 100644
--- a/drivers/media/platform/cadence/cdns-csi2rx.c
+++ b/drivers/media/platform/cadence/cdns-csi2rx.c
@@ -463,6 +463,10 @@ static const struct v4l2_subdev_ops csi2rx_subdev_ops = {
 	.pad		= &csi2rx_pad_ops,
 };
 
+static const struct media_entity_operations csi2rx_media_ops = {
+	.link_validate = v4l2_subdev_link_validate,
+};
+
 static int csi2rx_async_bound(struct v4l2_async_notifier *notifier,
 			      struct v4l2_subdev *s_subdev,
 			      struct v4l2_async_connection *asd)
@@ -679,6 +683,7 @@ static int csi2rx_probe(struct platform_device *pdev)
 	for (i = CSI2RX_PAD_SOURCE_STREAM0; i < CSI2RX_PAD_MAX; i++)
 		csi2rx->pads[i].flags = MEDIA_PAD_FL_SOURCE;
 	csi2rx->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
+	csi2rx->subdev.entity.ops = &csi2rx_media_ops;
 
 	ret = media_entity_pads_init(&csi2rx->subdev.entity, CSI2RX_PAD_MAX,
 				     csi2rx->pads);

-- 
2.41.0