media: rcar-csi2: Prepare for C-PHY support

Gen4 will support both D-PHY and C-PHY, while Gen3 only supports D-PHY.
Add two flags to the device information structure to be able to record
what each SoC supports.

Extend the device node parsing to accept both CSI_2 D-PHY and C-PHY
buses, while at the same time taking the SoC support into account.
Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
[Sakari Ailus: Line wrap.]
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>

drivers/media/platform/renesas/rcar-vin/rcar-csi2.c

@@ -490,6 +490,8 @@ struct rcar_csi2_info {
 	unsigned int num_channels;
 	bool clear_ulps;
 	bool use_isp;
+	bool support_dphy;
+	bool support_cphy;
 };
 
 struct rcar_csi2 {
@@ -511,6 +513,7 @@ struct rcar_csi2 {
 	struct v4l2_mbus_framefmt mf;
 	int stream_count;
 
+	bool cphy;
 	unsigned short lanes;
 	unsigned char lane_swap[4];
 };
@@ -665,7 +668,16 @@ static int rcsi2_get_active_lanes(struct rcar_csi2 *priv,
 		return ret;
 	}
 
-	if (mbus_config.type != V4L2_MBUS_CSI2_DPHY) {
+	switch (mbus_config.type) {
+	case V4L2_MBUS_CSI2_CPHY:
+		if (!priv->cphy)
+			return -EINVAL;
+		break;
+	case V4L2_MBUS_CSI2_DPHY:
+		if (priv->cphy)
+			return -EINVAL;
+		break;
+	default:
 		dev_err(priv->dev, "Unsupported media bus type %u\n",
 			mbus_config.type);
 		return -EINVAL;
@@ -1025,15 +1037,41 @@ static int rcsi2_parse_v4l2(struct rcar_csi2 *priv,
 	if (vep->base.port || vep->base.id)
 		return -ENOTCONN;
 
-	if (vep->bus_type != V4L2_MBUS_CSI2_DPHY) {
-		dev_err(priv->dev, "Unsupported bus: %u\n", vep->bus_type);
-		return -EINVAL;
-	}
-
 	priv->lanes = vep->bus.mipi_csi2.num_data_lanes;
-	if (priv->lanes != 1 && priv->lanes != 2 && priv->lanes != 4) {
-		dev_err(priv->dev, "Unsupported number of data-lanes: %u\n",
-			priv->lanes);
+
+	switch (vep->bus_type) {
+	case V4L2_MBUS_CSI2_DPHY:
+		if (!priv->info->support_dphy) {
+			dev_err(priv->dev, "D-PHY not supported\n");
+			return -EINVAL;
+		}
+
+		if (priv->lanes != 1 && priv->lanes != 2 && priv->lanes != 4) {
+			dev_err(priv->dev,
+				"Unsupported number of data-lanes for D-PHY: %u\n",
+				priv->lanes);
+			return -EINVAL;
+		}
+
+		priv->cphy = false;
+		break;
+	case V4L2_MBUS_CSI2_CPHY:
+		if (!priv->info->support_cphy) {
+			dev_err(priv->dev, "C-PHY not supported\n");
+			return -EINVAL;
+		}
+
+		if (priv->lanes != 3) {
+			dev_err(priv->dev,
+				"Unsupported number of data-lanes for C-PHY: %u\n",
+				priv->lanes);
+			return -EINVAL;
+		}
+
+		priv->cphy = true;
+		break;
+	default:
+		dev_err(priv->dev, "Unsupported bus: %u\n", vep->bus_type);
 		return -EINVAL;
 	}
 
@@ -1057,7 +1095,7 @@ static int rcsi2_parse_dt(struct rcar_csi2 *priv)
 	struct fwnode_handle *fwnode;
 	struct fwnode_handle *ep;
 	struct v4l2_fwnode_endpoint v4l2_ep = {
-		.bus_type = V4L2_MBUS_CSI2_DPHY
+		.bus_type = V4L2_MBUS_UNKNOWN,
 	};
 	int ret;
 
@@ -1378,6 +1416,7 @@ static const struct rcar_csi2_info rcar_csi2_info_r8a7795 = {
 	.csi0clkfreqrange = 0x20,
 	.num_channels = 4,
 	.clear_ulps = true,
+	.support_dphy = true,
 };
 
 static const struct rcar_csi2_info rcar_csi2_info_r8a7795es2 = {
@@ -1388,6 +1427,7 @@ static const struct rcar_csi2_info rcar_csi2_info_r8a7795es2 = {
 	.csi0clkfreqrange = 0x20,
 	.num_channels = 4,
 	.clear_ulps = true,
+	.support_dphy = true,
 };
 
 static const struct rcar_csi2_info rcar_csi2_info_r8a7796 = {
@@ -1395,6 +1435,7 @@ static const struct rcar_csi2_info rcar_csi2_info_r8a7796 = {
 	.enter_standby = rcsi2_enter_standby_gen3,
 	.hsfreqrange = hsfreqrange_m3w,
 	.num_channels = 4,
+	.support_dphy = true,
 };
 
 static const struct rcar_csi2_info rcar_csi2_info_r8a77961 = {
@@ -1402,6 +1443,7 @@ static const struct rcar_csi2_info rcar_csi2_info_r8a77961 = {
 	.enter_standby = rcsi2_enter_standby_gen3,
 	.hsfreqrange = hsfreqrange_m3w,
 	.num_channels = 4,
+	.support_dphy = true,
 };
 
 static const struct rcar_csi2_info rcar_csi2_info_r8a77965 = {
@@ -1412,6 +1454,7 @@ static const struct rcar_csi2_info rcar_csi2_info_r8a77965 = {
 	.csi0clkfreqrange = 0x20,
 	.num_channels = 4,
 	.clear_ulps = true,
+	.support_dphy = true,
 };
 
 static const struct rcar_csi2_info rcar_csi2_info_r8a77970 = {
@@ -1420,6 +1463,7 @@ static const struct rcar_csi2_info rcar_csi2_info_r8a77970 = {
 	.start_receiver = rcsi2_start_receiver_gen3,
 	.enter_standby = rcsi2_enter_standby_gen3,
 	.num_channels = 4,
+	.support_dphy = true,
 };
 
 static const struct rcar_csi2_info rcar_csi2_info_r8a77980 = {
@@ -1429,6 +1473,7 @@ static const struct rcar_csi2_info rcar_csi2_info_r8a77980 = {
 	.hsfreqrange = hsfreqrange_h3_v3h_m3n,
 	.csi0clkfreqrange = 0x20,
 	.clear_ulps = true,
+	.support_dphy = true,
 };
 
 static const struct rcar_csi2_info rcar_csi2_info_r8a77990 = {
@@ -1437,6 +1482,7 @@ static const struct rcar_csi2_info rcar_csi2_info_r8a77990 = {
 	.start_receiver = rcsi2_start_receiver_gen3,
 	.enter_standby = rcsi2_enter_standby_gen3,
 	.num_channels = 2,
+	.support_dphy = true,
 };
 
 static const struct rcar_csi2_info rcar_csi2_info_r8a779a0 = {
@@ -1447,6 +1493,7 @@ static const struct rcar_csi2_info rcar_csi2_info_r8a779a0 = {
 	.csi0clkfreqrange = 0x20,
 	.clear_ulps = true,
 	.use_isp = true,
+	.support_dphy = true,
 };
 
 static const struct of_device_id rcar_csi2_of_table[] = {