drivers/gpu/drm/bridge/imx/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 <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
  16 struct 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
  25 static 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
  34 static 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
  49 struct drm_bridge_funcs imx_legacy_bridge_funcs = {
  50         .attach = imx_legacy_bridge_attach,
  51         .get_modes = imx_legacy_bridge_get_modes,
  52 };
  53
  54 struct 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 }
  85 EXPORT_SYMBOL_GPL(devm_imx_drm_legacy_bridge);
  86
  87 MODULE_LICENSE("GPL");
  88 MODULE_DESCRIPTION("Freescale i.MX DRM bridge driver for legacy DT bindings");