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