drm/tilcdc: add a da850-specific compatible string

Due to some potential tweaks for the da850 LCDC (for example: the
required memory bandwith settings) we need a separate compatible
for the IP present on the da850 boards.
Suggested-by: NSekhar Nori <nsekhar@ti.com>
Signed-off-by: NBartosz Golaszewski <bgolaszewski@baylibre.com>
Acked-by: NRob Herring <robh@kernel.org>
Signed-off-by: NJyri Sarha <jsarha@ti.com>

Documentation/devicetree/bindings/display/tilcdc/tilcdc.txt

 Device-Tree bindings for tilcdc DRM driver
 
 Required properties:
- - compatible: value should be "ti,am33xx-tilcdc".
+ - compatible: value should be one of the following:
+    - "ti,am33xx-tilcdc" for AM335x based boards
+    - "ti,da850-tilcdc" for DA850/AM18x/OMAP-L138 based boards
  - interrupts: the interrupt number
  - reg: base address and size of the LCDC device
 
@@ -51,7 +53,7 @@ Optional nodes:
 Example:
 
 	fb: fb@4830e000 {
-		compatible = "ti,am33xx-tilcdc";
+		compatible = "ti,am33xx-tilcdc", "ti,da850-tilcdc";
 		reg = <0x4830e000 0x1000>;
 		interrupt-parent = <&intc>;
 		interrupts = <36>;

drivers/gpu/drm/tilcdc/tilcdc_drv.c

@@ -719,6 +719,7 @@ static int tilcdc_pdev_remove(struct platform_device *pdev)
 
 static struct of_device_id tilcdc_of_match[] = {
 		{ .compatible = "ti,am33xx-tilcdc", },
+		{ .compatible = "ti,da850-tilcdc", },
 		{ },
 };
 MODULE_DEVICE_TABLE(of, tilcdc_of_match);