linux-kernel - [RESEND:PATCH] mtd: davinci-nand: add support for partition binding nodes

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Message-ID: <1352236721-22913-1-git-send-email-m-karicheri2@ti.com>
Date:	Tue, 6 Nov 2012 16:18:41 -0500
From:	Murali Karicheri <m-karicheri2@...com>
To:	<grant.likely@...retlab.ca>, <rob.herring@...xeda.com>,
	<rob@...dley.net>, <dwmw2@...radead.org>,
	<artem.bityutskiy@...ux.intel.com>, <hs@...x.de>, <nsekhar@...com>,
	<mikedunn@...sguy.com>, <devicetree-discuss@...ts.ozlabs.org>,
	<linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-mtd@...ts.infradead.org>,
	<davinci-linux-open-source@...ux.davincidsp.com>
CC:	Murali Karicheri <m-karicheri2@...com>
Subject: [RESEND:PATCH] mtd: davinci-nand: add support for partition binding nodes

Enhance the driver to support partition subnodes inside the nand
device bindings to describe partitions on the nand device.

Signed-off-by: Murali Karicheri <m-karicheri2@...com>
---
 .../devicetree/bindings/arm/davinci/nand.txt       |    8 ++++++++
 drivers/mtd/nand/davinci_nand.c                    |   13 ++++++++++---
 2 files changed, 18 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/arm/davinci/nand.txt b/Documentation/devicetree/bindings/arm/davinci/nand.txt
index e37241f..4746452 100644
--- a/Documentation/devicetree/bindings/arm/davinci/nand.txt
+++ b/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@...00000 {
 	compatible = "ti,davinci-aemif";
@@ -47,5 +50,10 @@ aemif@...00000 {
 		ti,davinci-ecc-mode = "hw";
 		ti,davinci-ecc-bits = <4>;
 		ti,davinci-nand-use-bbt;
+
+		partition@...000 {
+			label = "ubifs";
+			reg = <0x180000 0x7e80000>;
+		};
 	};
 };
diff --git a/drivers/mtd/nand/davinci_nand.c b/drivers/mtd/nand/davinci_nand.c
index df1ab7d..321b053 100644
--- a/drivers/mtd/nand/davinci_nand.c
+++ b/drivers/mtd/nand/davinci_nand.c
@@ -821,9 +821,16 @@ syndrome_done:
 	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;
 
-- 
1.7.9.5

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