mtd: davinci: add support for parition binding nodes

Enhance the driver to support partition subnodes inside the nand
device bindings to describe partions on the nand device.
Signed-off-by: Murali Karicheri <m-karicheri2@ti.com>
Reviewed-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>

Documentation/devicetree/bindings/arm/davinci/nand.txt

@@ -23,6 +23,9 @@ Recommended properties :
 - ti,davinci-nand-buswidth: buswidth 8 or 16
 - ti,davinci-nand-use-bbt: use flash based bad block table support.
 
+nand device bindings may contain additional sub-nodes describing
+partitions of the address space. See partition.txt for more detail.
+
 Example (enbw_cmc board):
 aemif@60000000 {
 	compatible = "ti,davinci-aemif";
@@ -47,5 +50,10 @@ aemif@60000000 {
 		ti,davinci-ecc-mode = "hw";
 		ti,davinci-ecc-bits = <4>;
 		ti,davinci-nand-use-bbt;
+
+		partition@180000 {
+			label = "ubifs";
+			reg = <0x180000 0x7e80000>;
+		};
 	};
 };

drivers/mtd/nand/davinci_nand.c

@@ -821,9 +821,16 @@ static int __init nand_davinci_probe(struct platform_device *pdev)
 	if (ret < 0)
 		goto err_scan;
 
-	ret = mtd_device_parse_register(&info->mtd, NULL, NULL, pdata->parts,
-					pdata->nr_parts);
-
+	if (pdata->parts)
+		ret = mtd_device_parse_register(&info->mtd, NULL, NULL,
+					pdata->parts, pdata->nr_parts);
+	else {
+		struct mtd_part_parser_data	ppdata;
+
+		ppdata.of_node = pdev->dev.of_node;
+		ret = mtd_device_parse_register(&info->mtd, NULL, &ppdata,
+						NULL, 0);
+	}
 	if (ret < 0)
 		goto err_scan;