drm/panel: nt36523: Get orientation from OF

Some bright vendors mount their display panels upside down. Add the
required pieces to allow for accounting for that.
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Jianhua Lu <lujianhua000@gmail.com>
Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20230412-topic-lenovopanel-v3-3-bcf9ba4de46f@linaro.org

drivers/gpu/drm/panel/panel-novatek-nt36523.c

@@ -31,6 +31,7 @@ struct panel_info {
 	struct drm_panel panel;
 	struct mipi_dsi_device *dsi[2];
 	const struct panel_desc *desc;
+	enum drm_panel_orientation orientation;
 
 	struct gpio_desc *reset_gpio;
 	struct backlight_device *backlight;
@@ -674,11 +675,19 @@ static int nt36523_get_modes(struct drm_panel *panel,
 	return pinfo->desc->num_modes;
 }
 
+static enum drm_panel_orientation nt36523_get_orientation(struct drm_panel *panel)
+{
+	struct panel_info *pinfo = to_panel_info(panel);
+
+	return pinfo->orientation;
+}
+
 static const struct drm_panel_funcs nt36523_panel_funcs = {
 	.disable = nt36523_disable,
 	.prepare = nt36523_prepare,
 	.unprepare = nt36523_unprepare,
 	.get_modes = nt36523_get_modes,
+	.get_orientation = nt36523_get_orientation,
 };
 
 static int nt36523_bl_update_status(struct backlight_device *bl)
@@ -785,6 +794,12 @@ static int nt36523_probe(struct mipi_dsi_device *dsi)
 	mipi_dsi_set_drvdata(dsi, pinfo);
 	drm_panel_init(&pinfo->panel, dev, &nt36523_panel_funcs, DRM_MODE_CONNECTOR_DSI);
 
+	ret = of_drm_get_panel_orientation(dev->of_node, &pinfo->orientation);
+	if (ret < 0) {
+		dev_err(dev, "%pOF: failed to get orientation %d\n", dev->of_node, ret);
+		return ret;
+	}
+
 	if (pinfo->desc->has_dcs_backlight) {
 		pinfo->panel.backlight = nt36523_create_backlight(dsi);
 		if (IS_ERR(pinfo->panel.backlight))