Quelle  imx-legacy-bridge.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0+
/*
 * Freescale i.MX drm driver
 *
 * bridge driver for legacy DT bindings, utilizing display-timings node
 */

#include <linux/export.h>

#include <drm/drm_bridge.h>
#include <drm/drm_modes.h>
#include <drm/drm_probe_helper.h>
#include <drm/bridge/imx.h>

#include <video/of_display_timing.h>
#include <video/of_videomode.h>

struct imx_legacy_bridge {
 struct drm_bridge base;

 struct drm_display_mode mode;
 u32 bus_flags;
};

#define to_imx_legacy_bridge(bridge) container_of(bridge, struct imx_legacy_bridge, base)

static int imx_legacy_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 imx_legacy_bridge_get_modes(struct drm_bridge *bridge,
           struct drm_connector *connector)
{
 struct imx_legacy_bridge *imx_bridge = to_imx_legacy_bridge(bridge);
 int ret;

 ret = drm_connector_helper_get_modes_fixed(connector, &imx_bridge->mode);
 if (ret)
  return ret;

 connector->display_info.bus_flags = imx_bridge->bus_flags;

 return 0;
}

struct drm_bridge_funcs imx_legacy_bridge_funcs = {
 .attach = imx_legacy_bridge_attach,
 .get_modes = imx_legacy_bridge_get_modes,
};

struct drm_bridge *devm_imx_drm_legacy_bridge(struct device *dev,
           struct device_node *np,
           int type)
{
 struct imx_legacy_bridge *imx_bridge;
 int ret;

 imx_bridge = devm_drm_bridge_alloc(dev, struct imx_legacy_bridge,
        base, &imx_legacy_bridge_funcs);
 if (IS_ERR(imx_bridge))
  return ERR_CAST(imx_bridge);

 ret = of_get_drm_display_mode(np,
          &imx_bridge->mode,
          &imx_bridge->bus_flags,
          OF_USE_NATIVE_MODE);
 if (ret)
  return ERR_PTR(ret);

 imx_bridge->mode.type |= DRM_MODE_TYPE_DRIVER;

 imx_bridge->base.of_node = np;
 imx_bridge->base.ops = DRM_BRIDGE_OP_MODES;
 imx_bridge->base.type = type;

 ret = devm_drm_bridge_add(dev, &imx_bridge->base);
 if (ret)
  return ERR_PTR(ret);

 return &imx_bridge->base;
}
EXPORT_SYMBOL_GPL(devm_imx_drm_legacy_bridge);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Freescale i.MX DRM bridge driver for legacy DT bindings");