staging: imx-drm: Make IPU KMS parse display-timings

This patch adds support for parsing of the DT display-timings prop
to IPU KMS driver.

Signed-off-by: Marek Vasut <marex@denx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/imx-drm/parallel-display.c

@@ -57,6 +57,7 @@ static void imx_pd_connector_destroy(struct drm_connector *connector)
 static int imx_pd_connector_get_modes(struct drm_connector *connector)
 {
 	struct imx_parallel_display *imxpd = con_to_imxpd(connector);
+	struct device_node *np = imxpd->dev->of_node;
 	int num_modes = 0;
 
 	if (imxpd->edid) {
@@ -72,6 +73,15 @@ static int imx_pd_connector_get_modes(struct drm_connector *connector)
 		num_modes++;
 	}
 
+	if (np) {
+		struct drm_display_mode *mode = drm_mode_create(connector->dev);
+		of_get_drm_display_mode(np, &imxpd->mode, 0);
+		drm_mode_copy(mode, &imxpd->mode);
+		mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
+		drm_mode_probed_add(connector, mode);
+		num_modes++;
+	}
+
 	return num_modes;
 }