dto: panel: add a handler for lvds.mode to activate Dual channel

To make dual channel LVDS work, add a handler for "mode" variable in
config.xml by analogy with Jethro. So if Dual channel display is used,
this variable should be set to "spl0" value.

Signed-off-by: Mikhail Vanyulin <mikhail.vanyulin@rtsoft.de>

src/dto.c

@@ -501,6 +501,28 @@ static int create_panel_frag(void *dto_mem, const struct guf_xml_data *config)
 	return 0;
 }
 
+static int create_ldb_frag(void *dto_mem, const struct guf_xml_data *config)
+{
+	int err = 0;
+
+	if(!config || !config->display.name)
+		return 0;
+
+	err = create_label_fragment(dto_mem, "ldb");
+	DTO_ERR(err);
+	{
+		int offs = err;
+
+		if (config->lvds.mode && (!strcmp(config->lvds.mode, "spl0"))) {
+			err = fdt_setprop_empty(dto_mem, offs,
+						"fsl,dual-channel");
+			DTO_ERR(err);
+		}
+	}
+	return 0;
+}
+
+
 int create_property_fixup(void *dto_mem, int *offs, const char* prop,
 					   int prop_offs, const char* fixup)
 {
@@ -650,6 +672,8 @@ int dto_populate_dto(void *dto_mem,
 
 	err = create_panel_frag(dto_mem, config);
 	DTO_ERR(err);
+	err = create_ldb_frag(dto_mem, config);
+	DTO_ERR(err);
 	err = create_padctl_pwm1_frag(dto_mem, config);
 	DTO_ERR(err);
 	err = create_backlight_frag(dto_mem, config);