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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2012 Sascha Hauer, Pengutronix
*
* bridge driver for legacy DT bindings, utilizing display-timings node
*
* Author: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
*/
#include <linux/export.h>
#include <drm/drm_bridge.h>
#include <drm/drm_modes.h>
#include <drm/drm_probe_helper.h>
#include <drm/bridge/of-display-mode-bridge.h>
#include <video/of_display_timing.h>
#include <video/of_videomode.h>
struct of_display_mode_bridge {
struct drm_bridge base;
struct drm_display_mode mode;
u32 bus_flags;
};
#define to_of_display_mode_bridge(bridge) container_of(bridge, struct of_display_mode_bridge, base)
static int of_display_mode_bridge_attach(struct drm_bridge *bridge,
struct drm_encoder *encoder,
enum drm_bridge_attach_flags flags)
{
if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR))
return -EINVAL;
return 0;
}
static int of_display_mode_bridge_get_modes(struct drm_bridge *bridge,
struct drm_connector *connector)
{
struct of_display_mode_bridge *of_bridge = to_of_display_mode_bridge(bridge);
int ret;
ret = drm_connector_helper_get_modes_fixed(connector, &of_bridge->mode);
if (ret)
return ret;
connector->display_info.bus_flags = of_bridge->bus_flags;
return 0;
}
struct drm_bridge_funcs of_display_mode_bridge_funcs = {
.attach = of_display_mode_bridge_attach,
.get_modes = of_display_mode_bridge_get_modes,
};
struct drm_bridge *devm_drm_of_display_mode_bridge(struct device *dev,
struct device_node *np,
int type)
{
struct of_display_mode_bridge *of_bridge;
int ret;
of_bridge = devm_drm_bridge_alloc(dev, struct of_display_mode_bridge,
base, &of_display_mode_bridge_funcs);
if (IS_ERR(of_bridge))
return ERR_CAST(of_bridge);
ret = of_get_drm_display_mode(np,
&of_bridge->mode,
&of_bridge->bus_flags,
OF_USE_NATIVE_MODE);
if (ret)
return ERR_PTR(ret);
of_bridge->mode.type |= DRM_MODE_TYPE_DRIVER;
of_bridge->base.of_node = np;
of_bridge->base.ops = DRM_BRIDGE_OP_MODES;
of_bridge->base.type = type;
ret = devm_drm_bridge_add(dev, &of_bridge->base);
if (ret)
return ERR_PTR(ret);
return &of_bridge->base;
}
EXPORT_SYMBOL_GPL(devm_drm_of_display_mode_bridge);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("DRM bridge driver for legacy DT bindings");
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