From aa9e85c555924f9dc806a6f59034cb9c0b662c2a Mon Sep 17 00:00:00 2001
From: Sascha Hauer <s.hauer@pengutronix.de>
Date: Thu, 11 Jul 2013 18:55:30 +0200
Subject: [PATCH] of: add mtd of helpers

Directly taken from the kernel

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 drivers/of/Makefile |  1 +
 drivers/of/of_mtd.c | 82 +++++++++++++++++++++++++++++++++++++++++++++
 include/of_mtd.h    | 18 ++++++++++
 3 files changed, 101 insertions(+)
 create mode 100644 drivers/of/of_mtd.c
 create mode 100644 include/of_mtd.h

diff --git a/drivers/of/Makefile b/drivers/of/Makefile
index c81bbec89..a64437305 100644
--- a/drivers/of/Makefile
+++ b/drivers/of/Makefile
@@ -3,3 +3,4 @@ obj-$(CONFIG_OFTREE_MEM_GENERIC) += mem_generic.o
 obj-$(CONFIG_GPIOLIB) += gpio.o
 obj-y += partition.o
 obj-y += of_net.o
+obj-$(CONFIG_MTD) += of_mtd.o
diff --git a/drivers/of/of_mtd.c b/drivers/of/of_mtd.c
new file mode 100644
index 000000000..239f1f989
--- /dev/null
+++ b/drivers/of/of_mtd.c
@@ -0,0 +1,82 @@
+/*
+ * Copyright 2012 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
+ *
+ * OF helpers for mtd.
+ *
+ * This file is released under the GPLv2
+ *
+ */
+#include <common.h>
+#include <of_mtd.h>
+#include <linux/mtd/nand.h>
+
+/**
+ * It maps 'enum nand_ecc_modes_t' found in include/linux/mtd/nand.h
+ * into the device tree binding of 'nand-ecc', so that MTD
+ * device driver can get nand ecc from device tree.
+ */
+static const char *nand_ecc_modes[] = {
+	[NAND_ECC_NONE]		= "none",
+	[NAND_ECC_SOFT]		= "soft",
+	[NAND_ECC_HW]		= "hw",
+	[NAND_ECC_HW_SYNDROME]	= "hw_syndrome",
+};
+
+/**
+ * of_get_nand_ecc_mode - Get nand ecc mode for given device_node
+ * @np:	Pointer to the given device_node
+ *
+ * The function gets ecc mode string from property 'nand-ecc-mode',
+ * and return its index in nand_ecc_modes table, or errno in error case.
+ */
+int of_get_nand_ecc_mode(struct device_node *np)
+{
+	const char *pm;
+	int err, i;
+
+	err = of_property_read_string(np, "nand-ecc-mode", &pm);
+	if (err < 0)
+		return err;
+
+	for (i = 0; i < ARRAY_SIZE(nand_ecc_modes); i++)
+		if (!strcasecmp(pm, nand_ecc_modes[i]))
+			return i;
+
+	return -ENODEV;
+}
+EXPORT_SYMBOL_GPL(of_get_nand_ecc_mode);
+
+/**
+ * of_get_nand_bus_width - Get nand bus witdh for given device_node
+ * @np:	Pointer to the given device_node
+ *
+ * return bus width option, or errno in error case.
+ */
+int of_get_nand_bus_width(struct device_node *np)
+{
+	u32 val;
+
+	if (of_property_read_u32(np, "nand-bus-width", &val))
+		return 8;
+
+	switch(val) {
+	case 8:
+	case 16:
+		return val;
+	default:
+		return -EIO;
+	}
+}
+EXPORT_SYMBOL_GPL(of_get_nand_bus_width);
+
+/**
+ * of_get_nand_on_flash_bbt - Get nand on flash bbt for given device_node
+ * @np:	Pointer to the given device_node
+ *
+ * return true if present false other wise
+ */
+bool of_get_nand_on_flash_bbt(struct device_node *np)
+{
+	return of_property_read_bool(np, "nand-on-flash-bbt");
+}
+EXPORT_SYMBOL_GPL(of_get_nand_on_flash_bbt);
diff --git a/include/of_mtd.h b/include/of_mtd.h
new file mode 100644
index 000000000..a5a8f20da
--- /dev/null
+++ b/include/of_mtd.h
@@ -0,0 +1,18 @@
+/*
+ * Copyright 2012 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
+ *
+ * OF helpers for mtd.
+ *
+ * This file is released under the GPLv2
+ */
+
+#ifndef __LINUX_OF_MTD_H
+#define __LINUX_OF_MTD_H
+
+#include <of.h>
+
+int of_get_nand_ecc_mode(struct device_node *np);
+int of_get_nand_bus_width(struct device_node *np);
+bool of_get_nand_on_flash_bbt(struct device_node *np);
+
+#endif /* __LINUX_OF_MTD_H */