media: v4l: Add support for CSI-1 and CCP2 busses

CCP2 and CSI-1, are older single data lane serial busses.

[mchehab@s-opensource.com: don't use spaces for identation]
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Pavel Machek <pavel@ucw.cz>
Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/platform/pxa_camera.c

@@ -638,6 +638,9 @@ static unsigned int pxa_mbus_config_compatible(const struct v4l2_mbus_config *cf
 		mipi_clock = common_flags & (V4L2_MBUS_CSI2_NONCONTINUOUS_CLOCK |
 					     V4L2_MBUS_CSI2_CONTINUOUS_CLOCK);
 		return (!mipi_lanes || !mipi_clock) ? 0 : common_flags;
+	default:
+		__WARN();
+		return -EINVAL;
 	}
 	return 0;
 }

drivers/media/platform/soc_camera/soc_mediabus.c

@@ -508,6 +508,9 @@ unsigned int soc_mbus_config_compatible(const struct v4l2_mbus_config *cfg,
 		mipi_clock = common_flags & (V4L2_MBUS_CSI2_NONCONTINUOUS_CLOCK |
 					     V4L2_MBUS_CSI2_CONTINUOUS_CLOCK);
 		return (!mipi_lanes || !mipi_clock) ? 0 : common_flags;
+	default:
+		__WARN();
+		return -EINVAL;
 	}
 	return 0;
 }

drivers/media/v4l2-core/v4l2-fwnode.c

@@ -154,6 +154,31 @@ static void v4l2_fwnode_endpoint_parse_parallel_bus(
 
 }
 
+void v4l2_fwnode_endpoint_parse_csi1_bus(struct fwnode_handle *fwnode,
+					 struct v4l2_fwnode_endpoint *vep,
+					 u32 bus_type)
+{
+	struct v4l2_fwnode_bus_mipi_csi1 *bus = &vep->bus.mipi_csi1;
+	u32 v;
+
+	if (!fwnode_property_read_u32(fwnode, "clock-inv", &v))
+		bus->clock_inv = v;
+
+	if (!fwnode_property_read_u32(fwnode, "strobe", &v))
+		bus->strobe = v;
+
+	if (!fwnode_property_read_u32(fwnode, "data-lanes", &v))
+		bus->data_lane = v;
+
+	if (!fwnode_property_read_u32(fwnode, "clock-lanes", &v))
+		bus->clock_lane = v;
+
+	if (bus_type == V4L2_FWNODE_BUS_TYPE_CCP2)
+		vep->bus_type = V4L2_MBUS_CCP2;
+	else
+		vep->bus_type = V4L2_MBUS_CSI1;
+}
+
 /**
  * v4l2_fwnode_endpoint_parse() - parse all fwnode node properties
  * @fwnode: pointer to the endpoint's fwnode handle
@@ -187,17 +212,28 @@ int v4l2_fwnode_endpoint_parse(struct fwnode_handle *fwnode,
 
 	fwnode_property_read_u32(fwnode, "bus-type", &bus_type);
 
-	rval = v4l2_fwnode_endpoint_parse_csi2_bus(fwnode, vep);
-	if (rval)
-		return rval;
-	/*
-	 * Parse the parallel video bus properties only if none
-	 * of the MIPI CSI-2 specific properties were found.
-	 */
-	if (vep->bus.mipi_csi2.flags == 0)
-		v4l2_fwnode_endpoint_parse_parallel_bus(fwnode, vep);
-
-	return 0;
+	switch (bus_type) {
+	case V4L2_FWNODE_BUS_TYPE_GUESS:
+		rval = v4l2_fwnode_endpoint_parse_csi2_bus(fwnode, vep);
+		if (rval)
+			return rval;
+		/*
+		 * Parse the parallel video bus properties only if none
+		 * of the MIPI CSI-2 specific properties were found.
+		 */
+		if (vep->bus.mipi_csi2.flags == 0)
+			v4l2_fwnode_endpoint_parse_parallel_bus(fwnode, vep);
+
+		return 0;
+	case V4L2_FWNODE_BUS_TYPE_CCP2:
+	case V4L2_FWNODE_BUS_TYPE_CSI1:
+		v4l2_fwnode_endpoint_parse_csi1_bus(fwnode, vep, bus_type);
+
+		return 0;
+	default:
+		pr_warn("unsupported bus type %u\n", bus_type);
+		return -EINVAL;
+	}
 }
 EXPORT_SYMBOL_GPL(v4l2_fwnode_endpoint_parse);
 

include/media/v4l2-fwnode.h

@@ -55,6 +55,24 @@ struct v4l2_fwnode_bus_parallel {
 	unsigned char data_shift;
 };
 
+/**
+ * struct v4l2_fwnode_bus_mipi_csi1 - CSI-1/CCP2 data bus structure
+ * @clock_inv: polarity of clock/strobe signal
+ *	       false - not inverted, true - inverted
+ * @strobe: false - data/clock, true - data/strobe
+ * @lane_polarity: the polarities of the clock (index 0) and data lanes
+		   index (1)
+ * @data_lane: the number of the data lane
+ * @clock_lane: the number of the clock lane
+ */
+struct v4l2_fwnode_bus_mipi_csi1 {
+	bool clock_inv;
+	bool strobe;
+	bool lane_polarity[2];
+	unsigned char data_lane;
+	unsigned char clock_lane;
+};
+
 /**
  * struct v4l2_fwnode_endpoint - the endpoint data structure
  * @base: fwnode endpoint of the v4l2_fwnode
@@ -72,6 +90,7 @@ struct v4l2_fwnode_endpoint {
 	enum v4l2_mbus_type bus_type;
 	union {
 		struct v4l2_fwnode_bus_parallel parallel;
+		struct v4l2_fwnode_bus_mipi_csi1 mipi_csi1;
 		struct v4l2_fwnode_bus_mipi_csi2 mipi_csi2;
 	} bus;
 	u64 *link_frequencies;

include/media/v4l2-mediabus.h

@@ -69,11 +69,15 @@
  * @V4L2_MBUS_PARALLEL:	parallel interface with hsync and vsync
  * @V4L2_MBUS_BT656:	parallel interface with embedded synchronisation, can
  *			also be used for BT.1120
+ * @V4L2_MBUS_CSI1:	MIPI CSI-1 serial interface
+ * @V4L2_MBUS_CCP2:	CCP2 (Compact Camera Port 2)
  * @V4L2_MBUS_CSI2:	MIPI CSI-2 serial interface
  */
 enum v4l2_mbus_type {
 	V4L2_MBUS_PARALLEL,
 	V4L2_MBUS_BT656,
+	V4L2_MBUS_CSI1,
+	V4L2_MBUS_CCP2,
 	V4L2_MBUS_CSI2,
 };