linux-kernel - [PATCH v3 25/31] media: synopsys: csi2: Add default simple dw_csi2_subdev_init

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Message-Id: <20250821-95_cam-v3-25-c9286fbb34b9@nxp.com>
Date: Thu, 21 Aug 2025 16:16:00 -0400
From: Frank Li <Frank.Li@....com>
To: Rui Miguel Silva <rmfrfs@...il.com>, 
 Laurent Pinchart <laurent.pinchart@...asonboard.com>, 
 Martin Kepplinger <martink@...teo.de>, Purism Kernel Team <kernel@...i.sm>, 
 Mauro Carvalho Chehab <mchehab@...nel.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Eugen Hristev <eugen.hristev@...aro.org>, Shawn Guo <shawnguo@...nel.org>, 
 Sascha Hauer <s.hauer@...gutronix.de>, 
 Pengutronix Kernel Team <kernel@...gutronix.de>, 
 Fabio Estevam <festevam@...il.com>, Peng Fan <peng.fan@....com>, 
 Alice Yuan <alice.yuan@....com>, Vinod Koul <vkoul@...nel.org>, 
 Kishon Vijay Abraham I <kishon@...nel.org>, 
 Philipp Zabel <p.zabel@...gutronix.de>, 
 Steve Longerbeam <slongerbeam@...il.com>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: linux-media@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, imx@...ts.linux.dev, 
 linux-arm-kernel@...ts.infradead.org, linux-phy@...ts.infradead.org, 
 linux-staging@...ts.linux.dev, Frank Li <Frank.Li@....com>
Subject: [PATCH v3 25/31] media: synopsys: csi2: Add default simple
 dw_csi2_subdev_init_state

Add default simple dw_csi2_subdev_init_state, which have 1 sink and 1
source pad, 1920x1080p and MEDIA_BUS_FMT_UYVY8_1X16 format.

Signed-off-by: Frank Li <Frank.Li@....com>
---
 drivers/media/platform/synopsys/mipi-csi2.c | 57 ++++++++++++++++++++++++++++-
 1 file changed, 56 insertions(+), 1 deletion(-)

diff --git a/drivers/media/platform/synopsys/mipi-csi2.c b/drivers/media/platform/synopsys/mipi-csi2.c
index 632ae5fd7da7850374c79dcff63b6ee4aee7b611..0b3bb099329017e81d2fb41387a3671e429dfe1c 100644
--- a/drivers/media/platform/synopsys/mipi-csi2.c
+++ b/drivers/media/platform/synopsys/mipi-csi2.c
@@ -831,6 +831,59 @@ static const struct v4l2_async_notifier_operations csi2_notify_ops = {
 	.unbind = csi2_notify_unbind,
 };
 
+static const struct v4l2_mbus_framefmt dwc_csi_default_fmt = {
+	.code = MEDIA_BUS_FMT_UYVY8_1X16,
+	.width = 1920,
+	.height = 1080,
+	.field = V4L2_FIELD_NONE,
+	.colorspace = V4L2_COLORSPACE_SMPTE170M,
+	.xfer_func = V4L2_MAP_XFER_FUNC_DEFAULT(V4L2_COLORSPACE_SMPTE170M),
+	.ycbcr_enc = V4L2_MAP_YCBCR_ENC_DEFAULT(V4L2_COLORSPACE_SMPTE170M),
+	.quantization = V4L2_QUANTIZATION_LIM_RANGE,
+};
+
+static int dw_csi2_subdev_set_routing(struct v4l2_subdev *sd,
+				      struct v4l2_subdev_state *state,
+				      struct v4l2_subdev_krouting *routing)
+{
+	int ret;
+
+	if (routing->num_routes > V4L2_FRAME_DESC_ENTRY_MAX)
+		return -EINVAL;
+
+	ret = v4l2_subdev_routing_validate(sd, routing,
+					   V4L2_SUBDEV_ROUTING_ONLY_1_TO_1);
+	if (ret)
+		return ret;
+
+	return v4l2_subdev_set_routing_with_fmt(sd, state, routing, &dwc_csi_default_fmt);
+}
+
+static int dw_csi2_subdev_init_state_simple(struct v4l2_subdev *sd,
+					    struct v4l2_subdev_state *sd_state)
+{
+	struct v4l2_subdev_route routes[] = {
+		{
+			.sink_pad = 0,
+			.sink_stream = 0,
+			.source_pad = 1,
+			.source_stream = 0,
+			.flags = V4L2_SUBDEV_ROUTE_FL_ACTIVE,
+		},
+	};
+
+	struct v4l2_subdev_krouting routing = {
+		.num_routes = ARRAY_SIZE(routes),
+		.routes = routes,
+	};
+
+	return dw_csi2_subdev_set_routing(sd, sd_state, &routing);
+}
+
+static const struct v4l2_subdev_internal_ops dw_csi2_simple_internal_ops = {
+	.init_state = dw_csi2_subdev_init_state_simple,
+};
+
 static int csi2_async_register(struct dw_mipi_csi2_dev *csi2)
 {
 	struct v4l2_fwnode_endpoint vep = {
@@ -954,7 +1007,9 @@ int dw_mipi_csi2_init(struct platform_device *pdev, struct dw_mipi_csi2_dev *csi
 
 	csi2->sd.owner = config->module;
 	strscpy(csi2->sd.name, config->name, sizeof(csi2->sd.name));
-	csi2->sd.internal_ops = config->internal_ops;
+	csi2->sd.internal_ops = config->internal_ops ?
+					config->internal_ops :
+					&dw_csi2_simple_internal_ops;
 	csi2->sd.grp_id = config->grp_id;
 	csi2->config = config;
 

-- 
2.34.1