[media] sh-mobile-ceu-driver: support max width and height in DT

Some CEU implementations have non-standard (larger) maximum supported
width and height values. Add two OF properties to specify them.

Signed-off-by: Guennadi Liakhovetski <[e-mail]>
Acked-by: Hans Verkuil <[e-mail]>
Acked-by: Laurent Pinchart <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

Documentation/devicetree/bindings/media/sh_mobile_ceu.txt

···
+Bindings, specific for the sh_mobile_ceu_camera.c driver:
+ - compatible: Should be "renesas,sh-mobile-ceu"
+ - reg: register base and size
+ - interrupts: the interrupt number
+ - interrupt-parent: the interrupt controller
+ - renesas,max-width: maximum image width, supported on this SoC
+ - renesas,max-height: maximum image height, supported on this SoC
+
+Example:
+
+ceu0: ceu@0xfe910000 {
+	compatible = "renesas,sh-mobile-ceu";
+	reg = <0xfe910000 0xa0>;
+	interrupt-parent = <&intcs>;
+	interrupts = <0x880>;
+	renesas,max-width = <8188>;
+	renesas,max-height = <8188>;
+};

drivers/media/platform/soc_camera/sh_mobile_ceu_camera.c

···
 
 	/* TODO: implement per-device bus flags */
 	if (pcdev->pdata) {
-		pcdev->max_width = pcdev->pdata->max_width ? : 2560;
-		pcdev->max_height = pcdev->pdata->max_height ? : 1920;
+		pcdev->max_width = pcdev->pdata->max_width;
+		pcdev->max_height = pcdev->pdata->max_height;
 		pcdev->flags = pcdev->pdata->flags;
+	}
+
+	if (!pcdev->max_width) {
+		unsigned int v;
+		err = of_property_read_u32(pdev->dev.of_node, "renesas,max-width", &v);
+		if (!err)
+			pcdev->max_width = v;
+
+		if (!pcdev->max_width)
+			pcdev->max_width = 2560;
+	}
+	if (!pcdev->max_height) {
+		unsigned int v;
+		err = of_property_read_u32(pdev->dev.of_node, "renesas,max-height", &v);
+		if (!err)
+			pcdev->max_height = v;
+
+		if (!pcdev->max_height)
+			pcdev->max_height = 1920;
 	}
 
 	base = devm_ioremap_resource(&pdev->dev, res);