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2024-05-13 9d77db3c730780c8ef5ccd4b66403ff5675cfe4e 
 kernel/drivers/staging/media/imx/imx-media-of.c
....@@ -1,14 +1,10 @@
1
+// SPDX-License-Identifier: GPL-2.0+
12 /*
23  * Media driver for Freescale i.MX5/6 SOC
34  *
45  * Open Firmware parsing.
56  *
67  * Copyright (c) 2016 Mentor Graphics Inc.
7
- *
8
- * This program is free software; you can redistribute it and/or modify
9
- * it under the terms of the GNU General Public License as published by
10
- * the Free Software Foundation; either version 2 of the License, or
11
- * (at your option) any later version.
128  */
139 #include <linux/of_platform.h>
1410 #include <media/v4l2-ctrls.h>
....@@ -20,121 +16,32 @@
2016 #include <video/imx-ipu-v3.h>
2117 #include "imx-media.h"
2218 
23
-static int of_get_port_count(const struct device_node *np)
19
+int imx_media_of_add_csi(struct imx_media_dev *imxmd,
20
+			 struct device_node *csi_np)
2421 {
25
-	struct device_node *ports, *child;
26
-	int num = 0;
22
+	struct v4l2_async_subdev *asd;
23
+	int ret = 0;
2724 
28
-	/* check if this node has a ports subnode */
29
-	ports = of_get_child_by_name(np, "ports");
30
-	if (ports)
31
-		np = ports;
32
-
33
-	for_each_child_of_node(np, child)
34
-		if (of_node_cmp(child->name, "port") == 0)
35
-			num++;
36
-
37
-	of_node_put(ports);
38
-	return num;
39
-}
40
-
41
-/*
42
- * find the remote device node given local endpoint node
43
- */
44
-static bool of_get_remote(struct device_node *epnode,
45
-			  struct device_node **remote_node)
46
-{
47
-	struct device_node *rp, *rpp;
48
-	struct device_node *remote;
49
-	bool is_csi_port;
50
-
51
-	rp = of_graph_get_remote_port(epnode);
52
-	rpp = of_graph_get_remote_port_parent(epnode);
53
-
54
-	if (of_device_is_compatible(rpp, "fsl,imx6q-ipu")) {
55
-		/* the remote is one of the CSI ports */
56
-		remote = rp;
57
-		of_node_put(rpp);
58
-		is_csi_port = true;
59
-	} else {
60
-		remote = rpp;
61
-		of_node_put(rp);
62
-		is_csi_port = false;
25
+	if (!of_device_is_available(csi_np)) {
26
+		dev_dbg(imxmd->md.dev, "%s: %pOFn not enabled\n", __func__,
27
+			csi_np);
28
+		return -ENODEV;
6329 	}
6430 
65
-	if (!of_device_is_available(remote)) {
66
-		of_node_put(remote);
67
-		*remote_node = NULL;
68
-	} else {
69
-		*remote_node = remote;
70
-	}
71
-
72
-	return is_csi_port;
73
-}
74
-
75
-static int
76
-of_parse_subdev(struct imx_media_dev *imxmd, struct device_node *sd_np,
77
-		bool is_csi_port)
78
-{
79
-	int i, num_ports, ret;
80
-
81
-	if (!of_device_is_available(sd_np)) {
82
-		dev_dbg(imxmd->md.dev, "%s: %s not enabled\n", __func__,
83
-			sd_np->name);
84
-		/* unavailable is not an error */
85
-		return 0;
86
-	}
87
-
88
-	/* register this subdev with async notifier */
89
-	ret = imx_media_add_async_subdev(imxmd, of_fwnode_handle(sd_np),
90
-					 NULL);
91
-	if (ret) {
92
-		if (ret == -EEXIST) {
93
-			/* already added, everything is fine */
94
-			return 0;
95
-		}
96
-
97
-		/* other error, can't continue */
98
-		return ret;
99
-	}
100
-
101
-	/*
102
-	 * the ipu-csi has one sink port. The source pads are not
103
-	 * represented in the device tree by port nodes, but are
104
-	 * described by the internal pads and links later.
105
-	 */
106
-	num_ports = is_csi_port ? 1 : of_get_port_count(sd_np);
107
-
108
-	for (i = 0; i < num_ports; i++) {
109
-		struct device_node *epnode = NULL, *port, *remote_np;
110
-
111
-		port = is_csi_port ? sd_np : of_graph_get_port_by_id(sd_np, i);
112
-		if (!port)
113
-			continue;
114
-
115
-		for_each_child_of_node(port, epnode) {
116
-			bool remote_is_csi;
117
-
118
-			remote_is_csi = of_get_remote(epnode, &remote_np);
119
-			if (!remote_np)
120
-				continue;
121
-
122
-			ret = of_parse_subdev(imxmd, remote_np, remote_is_csi);
123
-			of_node_put(remote_np);
124
-			if (ret)
125
-				break;
126
-		}
127
-
128
-		if (port != sd_np)
129
-			of_node_put(port);
130
-		if (ret) {
131
-			of_node_put(epnode);
132
-			break;
133
-		}
31
+	/* add CSI fwnode to async notifier */
32
+	asd = v4l2_async_notifier_add_fwnode_subdev(&imxmd->notifier,
33
+						    of_fwnode_handle(csi_np),
34
+						    sizeof(*asd));
35
+	if (IS_ERR(asd)) {
36
+		ret = PTR_ERR(asd);
37
+		if (ret == -EEXIST)
38
+			dev_dbg(imxmd->md.dev, "%s: already added %pOFn\n",
39
+				__func__, csi_np);
13440 	}
13541 
13642 	return ret;
13743 }
44
+EXPORT_SYMBOL_GPL(imx_media_of_add_csi);
13845 
13946 int imx_media_add_of_subdevs(struct imx_media_dev *imxmd,
14047 			     struct device_node *np)
....@@ -147,123 +54,23 @@
14754 		if (!csi_np)
14855 			break;
14956 
150
-		ret = of_parse_subdev(imxmd, csi_np, true);
151
-		of_node_put(csi_np);
152
-		if (ret)
153
-			return ret;
57
+		ret = imx_media_of_add_csi(imxmd, csi_np);
58
+		if (ret) {
59
+			/* unavailable or already added is not an error */
60
+			if (ret == -ENODEV || ret == -EEXIST) {
61
+				of_node_put(csi_np);
62
+				continue;
63
+			}
64
+
65
+			/* other error, can't continue */
66
+			goto err_out;
67
+		}
15468 	}
15569 
15670 	return 0;
71
+
72
+err_out:
73
+	of_node_put(csi_np);
74
+	return ret;
15775 }
158
-
159
-/*
160
- * Create a single media link to/from sd using a fwnode link.
161
- *
162
- * NOTE: this function assumes an OF port node is equivalent to
163
- * a media pad (port id equal to media pad index), and that an
164
- * OF endpoint node is equivalent to a media link.
165
- */
166
-static int create_of_link(struct imx_media_dev *imxmd,
167
-			  struct v4l2_subdev *sd,
168
-			  struct v4l2_fwnode_link *link)
169
-{
170
-	struct v4l2_subdev *remote, *src, *sink;
171
-	int src_pad, sink_pad;
172
-
173
-	if (link->local_port >= sd->entity.num_pads)
174
-		return -EINVAL;
175
-
176
-	remote = imx_media_find_subdev_by_fwnode(imxmd, link->remote_node);
177
-	if (!remote)
178
-		return 0;
179
-
180
-	if (sd->entity.pads[link->local_port].flags & MEDIA_PAD_FL_SINK) {
181
-		src = remote;
182
-		src_pad = link->remote_port;
183
-		sink = sd;
184
-		sink_pad = link->local_port;
185
-	} else {
186
-		src = sd;
187
-		src_pad = link->local_port;
188
-		sink = remote;
189
-		sink_pad = link->remote_port;
190
-	}
191
-
192
-	/* make sure link doesn't already exist before creating */
193
-	if (media_entity_find_link(&src->entity.pads[src_pad],
194
-				   &sink->entity.pads[sink_pad]))
195
-		return 0;
196
-
197
-	v4l2_info(sd->v4l2_dev, "%s:%d -> %s:%d\n",
198
-		  src->name, src_pad, sink->name, sink_pad);
199
-
200
-	return media_create_pad_link(&src->entity, src_pad,
201
-				     &sink->entity, sink_pad, 0);
202
-}
203
-
204
-/*
205
- * Create media links to/from sd using its device-tree endpoints.
206
- */
207
-int imx_media_create_of_links(struct imx_media_dev *imxmd,
208
-			      struct v4l2_subdev *sd)
209
-{
210
-	struct v4l2_fwnode_link link;
211
-	struct device_node *ep;
212
-	int ret;
213
-
214
-	for_each_endpoint_of_node(sd->dev->of_node, ep) {
215
-		ret = v4l2_fwnode_parse_link(of_fwnode_handle(ep), &link);
216
-		if (ret)
217
-			continue;
218
-
219
-		ret = create_of_link(imxmd, sd, &link);
220
-		v4l2_fwnode_put_link(&link);
221
-		if (ret)
222
-			return ret;
223
-	}
224
-
225
-	return 0;
226
-}
227
-
228
-/*
229
- * Create media links to the given CSI subdevice's sink pads,
230
- * using its device-tree endpoints.
231
- */
232
-int imx_media_create_csi_of_links(struct imx_media_dev *imxmd,
233
-				  struct v4l2_subdev *csi)
234
-{
235
-	struct device_node *csi_np = csi->dev->of_node;
236
-	struct device_node *ep;
237
-
238
-	for_each_child_of_node(csi_np, ep) {
239
-		struct fwnode_handle *fwnode, *csi_ep;
240
-		struct v4l2_fwnode_link link;
241
-		int ret;
242
-
243
-		memset(&link, 0, sizeof(link));
244
-
245
-		link.local_node = of_fwnode_handle(csi_np);
246
-		link.local_port = CSI_SINK_PAD;
247
-
248
-		csi_ep = of_fwnode_handle(ep);
249
-
250
-		fwnode = fwnode_graph_get_remote_endpoint(csi_ep);
251
-		if (!fwnode)
252
-			continue;
253
-
254
-		fwnode = fwnode_get_parent(fwnode);
255
-		fwnode_property_read_u32(fwnode, "reg", &link.remote_port);
256
-		fwnode = fwnode_get_next_parent(fwnode);
257
-		if (is_of_node(fwnode) &&
258
-		    of_node_cmp(to_of_node(fwnode)->name, "ports") == 0)
259
-			fwnode = fwnode_get_next_parent(fwnode);
260
-		link.remote_node = fwnode;
261
-
262
-		ret = create_of_link(imxmd, csi, &link);
263
-		fwnode_handle_put(link.remote_node);
264
-		if (ret)
265
-			return ret;
266
-	}
267
-
268
-	return 0;
269
-}
76
+EXPORT_SYMBOL_GPL(imx_media_add_of_subdevs);