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media: i2c: imx274: implement fwnode parsing

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Implement fwnode parsing at probe time.
Check if the bus and number of lanes are supported.

Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Eugen Hristev 2021-11-23 13:04:21 +01:00 committed by Mauro Carvalho Chehab
parent 57de5bb2bd
commit 0abb8f9052
1 changed files with 40 additions and 0 deletions
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40
drivers/media/i2c/imx274.c
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@ -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_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);