imx-legacy-bridge.c

 1// SPDX-License-Identifier: GPL-2.0+
 2/*
 3 * Freescale i.MX drm driver
 4 *
 5 * bridge driver for legacy DT bindings, utilizing display-timings node
 6 */
 7
 8#include <linux/export.h>
 9
10#include <drm/drm_bridge.h>
11#include <drm/drm_modes.h>
12#include <drm/drm_probe_helper.h>
13#include <drm/bridge/imx.h>
14
15#include <video/of_display_timing.h>
16#include <video/of_videomode.h>
17
18struct imx_legacy_bridge {
19	struct drm_bridge base;
20
21	struct drm_display_mode mode;
22	u32 bus_flags;
23};
24
25#define to_imx_legacy_bridge(bridge)	container_of(bridge, struct imx_legacy_bridge, base)
26
27static int imx_legacy_bridge_attach(struct drm_bridge *bridge,
28				    struct drm_encoder *encoder,
29				    enum drm_bridge_attach_flags flags)
30{
31	if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR))
32		return -EINVAL;
33
34	return 0;
35}
36
37static int imx_legacy_bridge_get_modes(struct drm_bridge *bridge,
38				       struct drm_connector *connector)
39{
40	struct imx_legacy_bridge *imx_bridge = to_imx_legacy_bridge(bridge);
41	int ret;
42
43	ret = drm_connector_helper_get_modes_fixed(connector, &imx_bridge->mode);
44	if (ret)
45		return ret;
46
47	connector->display_info.bus_flags = imx_bridge->bus_flags;
48
49	return 0;
50}
51
52struct drm_bridge_funcs imx_legacy_bridge_funcs = {
53	.attach = imx_legacy_bridge_attach,
54	.get_modes = imx_legacy_bridge_get_modes,
55};
56
57struct drm_bridge *devm_imx_drm_legacy_bridge(struct device *dev,
58					      struct device_node *np,
59					      int type)
60{
61	struct imx_legacy_bridge *imx_bridge;
62	int ret;
63
64	imx_bridge = devm_drm_bridge_alloc(dev, struct imx_legacy_bridge,
65					   base, &imx_legacy_bridge_funcs);
66	if (IS_ERR(imx_bridge))
67		return ERR_CAST(imx_bridge);
68
69	ret = of_get_drm_display_mode(np,
70				      &imx_bridge->mode,
71				      &imx_bridge->bus_flags,
72				      OF_USE_NATIVE_MODE);
73	if (ret)
74		return ERR_PTR(ret);
75
76	imx_bridge->mode.type |= DRM_MODE_TYPE_DRIVER;
77
78	imx_bridge->base.of_node = np;
79	imx_bridge->base.ops = DRM_BRIDGE_OP_MODES;
80	imx_bridge->base.type = type;
81
82	ret = devm_drm_bridge_add(dev, &imx_bridge->base);
83	if (ret)
84		return ERR_PTR(ret);
85
86	return &imx_bridge->base;
87}
88EXPORT_SYMBOL_GPL(devm_imx_drm_legacy_bridge);
89
90MODULE_LICENSE("GPL");
91MODULE_DESCRIPTION("Freescale i.MX DRM bridge driver for legacy DT bindings");