Implement fwnode parsing at probe time.
Check if the bus and number of lanes are supported.
Signed-off-by: Eugen Hristev <eugen.hristev@xxxxxxxxxxxxx>
---
drivers/media/i2c/imx274.c | 40 ++++++++++++++++++++++++++++++++++++++
1 file changed, 40 insertions(+)
diff --git a/drivers/media/i2c/imx274.c b/drivers/media/i2c/imx274.c
index e31f006b10d9..774912f44efe 100644
--- a/drivers/media/i2c/imx274.c
+++ b/drivers/media/i2c/imx274.c
@@ -27,6 +27,7 @@
#include <media/v4l2-ctrls.h>
#include <media/v4l2-device.h>
+#include <media/v4l2-fwnode.h>
#include <media/v4l2-subdev.h>
/*
@@ -1957,6 +1958,41 @@ static const struct i2c_device_id imx274_id[] = {
};
MODULE_DEVICE_TABLE(i2c, imx274_id);
+static int imx274_fwnode_parse(struct device *dev)
+{
+ struct fwnode_handle *endpoint;
+ /* Only CSI2 is supported */
+ struct v4l2_fwnode_endpoint ep = {
+ .bus_type = V4L2_MBUS_CSI2_DPHY
+ };
+ int ret;
+
+ endpoint = fwnode_graph_get_next_endpoint(dev_fwnode(dev), NULL);
+ if (!endpoint) {
+ dev_err(dev, "Endpoint node not found\n");
+ return -EINVAL;
+ }
+
+ ret = v4l2_fwnode_endpoint_alloc_parse(endpoint, &ep);
+ fwnode_handle_put(endpoint);
+ if (ret == -ENXIO) {
+ dev_err(dev, "Unsupported bus type, should be CSI2\n");
+ return ret;
+ } else if (ret) {
+ dev_err(dev, "Parsing endpoint node failed %d\n", ret);
+ return ret;
+ }
+
+ /* Check number of data lanes, only 4 lanes supported */
+ if (ep.bus.mipi_csi2.num_data_lanes != 4) {
+ dev_err(dev, "Invalid data lanes: %d\n",
+ ep.bus.mipi_csi2.num_data_lanes);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
static int imx274_probe(struct i2c_client *client)
{
struct v4l2_subdev *sd;
@@ -1971,6 +2007,10 @@ static int imx274_probe(struct i2c_client *client)
mutex_init(&imx274->lock);
+ ret = imx274_fwnode_parse(dev);
+ if (ret)
+ return ret;
+
imx274->inck = devm_clk_get_optional(dev, "inck");
if (IS_ERR(imx274->inck))
return PTR_ERR(imx274->inck);
--
2.25.1
