[PATCHv4 2/3] drm: add a helper function to extract 'de-active' and 'pixelclk-active' from DT

["Lothar Waßmann" <LW@KARO-electronics.de>]

add a helper function to extract information about pixel clock and DE
polarity from DT for use by of_get_drm_display_mode().
While at it, convert spaces to tabs in indentation in drm_modes.h.

Signed-off-by: Lothar Waßmann <LW@KARO-electronics.de>
---
 drivers/gpu/drm/drm_modes.c | 15 +++++++++++++++
 include/drm/drm_modes.h     |  3 ++-
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c
index fc5040a..51804e5 100644
--- a/drivers/gpu/drm/drm_modes.c
+++ b/drivers/gpu/drm/drm_modes.c
@@ -657,6 +657,21 @@ void drm_display_mode_to_videomode(const struct drm_display_mode *dmode,
 }
 EXPORT_SYMBOL_GPL(drm_display_mode_to_videomode);
 
+void drm_bus_flags_from_videomode(const struct videomode *vm, u32 *bus_flags)
+{
+	*bus_flags = 0;
+	if (vm->flags & DISPLAY_FLAGS_PIXDATA_POSEDGE)
+		*bus_flags |= DRM_BUS_FLAG_PIXDATA_POSEDGE;
+	if (vm->flags & DISPLAY_FLAGS_PIXDATA_NEGEDGE)
+		*bus_flags |= DRM_BUS_FLAG_PIXDATA_NEGEDGE;
+
+	if (vm->flags & DISPLAY_FLAGS_DE_LOW)
+		*bus_flags |= DRM_BUS_FLAG_DE_LOW;
+	if (vm->flags & DISPLAY_FLAGS_DE_HIGH)
+		*bus_flags |= DRM_BUS_FLAG_DE_HIGH;
+}
+EXPORT_SYMBOL_GPL(drm_bus_flags_from_videomode);
+
 #ifdef CONFIG_OF
 /**
  * of_get_drm_display_mode - get a drm_display_mode from devicetree
diff --git a/include/drm/drm_modes.h b/include/drm/drm_modes.h
index ff48177..a8164d2 100644
--- a/include/drm/drm_modes.h
+++ b/include/drm/drm_modes.h
@@ -434,7 +434,7 @@ struct drm_cmdline_mode;
 struct drm_display_mode *drm_mode_create(struct drm_device *dev);
 void drm_mode_destroy(struct drm_device *dev, struct drm_display_mode *mode);
 void drm_mode_convert_to_umode(struct drm_mode_modeinfo *out,
-                               const struct drm_display_mode *in);
+			       const struct drm_display_mode *in);
 int drm_mode_convert_umode(struct drm_display_mode *out,
 			   const struct drm_mode_modeinfo *in);
 void drm_mode_probed_add(struct drm_connector *connector, struct drm_display_mode *mode);
@@ -457,6 +457,7 @@ void drm_display_mode_from_videomode(const struct videomode *vm,
 				     struct drm_display_mode *dmode);
 void drm_display_mode_to_videomode(const struct drm_display_mode *dmode,
 				   struct videomode *vm);
+void drm_bus_flags_from_videomode(const struct videomode *vm, u32 *bus_flags);
 int of_get_drm_display_mode(struct device_node *np,
 			    struct drm_display_mode *dmode,
 			    int index);
-- 
2.1.4