| // SPDX-License-Identifier: GPL-2.0+ |
| /* |
| * Media driver for Freescale i.MX5/6 SOC |
| * |
| * Open Firmware parsing. |
| * |
| * Copyright (c) 2016 Mentor Graphics Inc. |
| */ |
| #include <linux/of_platform.h> |
| #include <media/v4l2-ctrls.h> |
| #include <media/v4l2-device.h> |
| #include <media/v4l2-fwnode.h> |
| #include <media/v4l2-subdev.h> |
| #include <media/videobuf2-dma-contig.h> |
| #include <linux/of_graph.h> |
| #include <video/imx-ipu-v3.h> |
| #include "imx-media.h" |
| |
| int imx_media_of_add_csi(struct imx_media_dev *imxmd, |
| struct device_node *csi_np) |
| { |
| struct v4l2_async_subdev *asd; |
| int ret = 0; |
| |
| if (!of_device_is_available(csi_np)) { |
| dev_dbg(imxmd->md.dev, "%s: %pOFn not enabled\n", __func__, |
| csi_np); |
| return -ENODEV; |
| } |
| |
| /* add CSI fwnode to async notifier */ |
| asd = v4l2_async_notifier_add_fwnode_subdev(&imxmd->notifier, |
| of_fwnode_handle(csi_np), |
| sizeof(*asd)); |
| if (IS_ERR(asd)) { |
| ret = PTR_ERR(asd); |
| if (ret == -EEXIST) |
| dev_dbg(imxmd->md.dev, "%s: already added %pOFn\n", |
| __func__, csi_np); |
| } |
| |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(imx_media_of_add_csi); |
| |
| int imx_media_add_of_subdevs(struct imx_media_dev *imxmd, |
| struct device_node *np) |
| { |
| struct device_node *csi_np; |
| int i, ret; |
| |
| for (i = 0; ; i++) { |
| csi_np = of_parse_phandle(np, "ports", i); |
| if (!csi_np) |
| break; |
| |
| ret = imx_media_of_add_csi(imxmd, csi_np); |
| if (ret) { |
| /* unavailable or already added is not an error */ |
| if (ret == -ENODEV || ret == -EEXIST) { |
| of_node_put(csi_np); |
| continue; |
| } |
| |
| /* other error, can't continue */ |
| goto err_out; |
| } |
| } |
| |
| return 0; |
| |
| err_out: |
| of_node_put(csi_np); |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(imx_media_add_of_subdevs); |
| |
| /* |
| * Create a single media link to/from sd using a fwnode link. |
| * |
| * NOTE: this function assumes an OF port node is equivalent to |
| * a media pad (port id equal to media pad index), and that an |
| * OF endpoint node is equivalent to a media link. |
| */ |
| static int create_of_link(struct imx_media_dev *imxmd, |
| struct v4l2_subdev *sd, |
| struct v4l2_fwnode_link *link) |
| { |
| struct v4l2_subdev *remote, *src, *sink; |
| int src_pad, sink_pad; |
| |
| if (link->local_port >= sd->entity.num_pads) |
| return -EINVAL; |
| |
| remote = imx_media_find_subdev_by_fwnode(imxmd, link->remote_node); |
| if (!remote) |
| return 0; |
| |
| if (sd->entity.pads[link->local_port].flags & MEDIA_PAD_FL_SINK) { |
| src = remote; |
| src_pad = link->remote_port; |
| sink = sd; |
| sink_pad = link->local_port; |
| } else { |
| src = sd; |
| src_pad = link->local_port; |
| sink = remote; |
| sink_pad = link->remote_port; |
| } |
| |
| /* make sure link doesn't already exist before creating */ |
| if (media_entity_find_link(&src->entity.pads[src_pad], |
| &sink->entity.pads[sink_pad])) |
| return 0; |
| |
| v4l2_info(sd->v4l2_dev, "%s:%d -> %s:%d\n", |
| src->name, src_pad, sink->name, sink_pad); |
| |
| return media_create_pad_link(&src->entity, src_pad, |
| &sink->entity, sink_pad, 0); |
| } |
| |
| /* |
| * Create media links to/from sd using its device-tree endpoints. |
| */ |
| int imx_media_create_of_links(struct imx_media_dev *imxmd, |
| struct v4l2_subdev *sd) |
| { |
| struct v4l2_fwnode_link link; |
| struct device_node *ep; |
| int ret; |
| |
| for_each_endpoint_of_node(sd->dev->of_node, ep) { |
| ret = v4l2_fwnode_parse_link(of_fwnode_handle(ep), &link); |
| if (ret) |
| continue; |
| |
| ret = create_of_link(imxmd, sd, &link); |
| v4l2_fwnode_put_link(&link); |
| if (ret) |
| return ret; |
| } |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(imx_media_create_of_links); |
| |
| /* |
| * Create media links to the given CSI subdevice's sink pads, |
| * using its device-tree endpoints. |
| */ |
| int imx_media_create_csi_of_links(struct imx_media_dev *imxmd, |
| struct v4l2_subdev *csi) |
| { |
| struct device_node *csi_np = csi->dev->of_node; |
| struct device_node *ep; |
| |
| for_each_child_of_node(csi_np, ep) { |
| struct fwnode_handle *fwnode, *csi_ep; |
| struct v4l2_fwnode_link link; |
| int ret; |
| |
| memset(&link, 0, sizeof(link)); |
| |
| link.local_node = of_fwnode_handle(csi_np); |
| link.local_port = CSI_SINK_PAD; |
| |
| csi_ep = of_fwnode_handle(ep); |
| |
| fwnode = fwnode_graph_get_remote_endpoint(csi_ep); |
| if (!fwnode) |
| continue; |
| |
| fwnode = fwnode_get_parent(fwnode); |
| fwnode_property_read_u32(fwnode, "reg", &link.remote_port); |
| fwnode = fwnode_get_next_parent(fwnode); |
| if (is_of_node(fwnode) && |
| of_node_name_eq(to_of_node(fwnode), "ports")) |
| fwnode = fwnode_get_next_parent(fwnode); |
| link.remote_node = fwnode; |
| |
| ret = create_of_link(imxmd, csi, &link); |
| fwnode_handle_put(link.remote_node); |
| if (ret) |
| return ret; |
| } |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(imx_media_create_csi_of_links); |