[PATCH] of: mtd: Import of_get_nand_ecc_{step_size, strength} from Linux

[Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>]

This imports DT helpers for MTD ECC step size and strength from
Linux kernel.

Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
---
Cc: Robert Jarzmik <robert.jarzmik@free.fr>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
Cc: barebox@lists.infradead.org

Just for completeness, the patch that will import of_mtd helpers
for ECC from Linux. I'll make sure this is included in v2.

Sebastian
---
 drivers/of/of_mtd.c | 34 ++++++++++++++++++++++++++++++++++
 include/of_mtd.h    |  2 ++
 2 files changed, 36 insertions(+)

diff --git a/drivers/of/of_mtd.c b/drivers/of/of_mtd.c
index 97f3095740f7..0956ee15d393 100644
--- a/drivers/of/of_mtd.c
+++ b/drivers/of/of_mtd.c
@@ -49,6 +49,40 @@ int of_get_nand_ecc_mode(struct device_node *np)
 EXPORT_SYMBOL_GPL(of_get_nand_ecc_mode);
 
 /**
+ * of_get_nand_ecc_step_size - Get ECC step size associated to
+ * the required ECC strength (see below).
+ * @np:	Pointer to the given device_node
+ *
+ * return the ECC step size, or errno in error case.
+ */
+int of_get_nand_ecc_step_size(struct device_node *np)
+{
+	int ret;
+	u32 val;
+
+	ret = of_property_read_u32(np, "nand-ecc-step-size", &val);
+	return ret ? ret : val;
+}
+EXPORT_SYMBOL_GPL(of_get_nand_ecc_step_size);
+
+/**
+ * of_get_nand_ecc_strength - Get required ECC strength over the
+ * correspnding step size as defined by 'nand-ecc-size'
+ * @np:	Pointer to the given device_node
+ *
+ * return the ECC strength, or errno in error case.
+ */
+int of_get_nand_ecc_strength(struct device_node *np)
+{
+	int ret;
+	u32 val;
+
+	ret = of_property_read_u32(np, "nand-ecc-strength", &val);
+	return ret ? ret : val;
+}
+EXPORT_SYMBOL_GPL(of_get_nand_ecc_strength);
+
+/**
  * of_get_nand_bus_width - Get nand bus witdh for given device_node
  * @np:	Pointer to the given device_node
  *
diff --git a/include/of_mtd.h b/include/of_mtd.h
index a5a8f20daff6..9f5b8a2796a2 100644
--- a/include/of_mtd.h
+++ b/include/of_mtd.h
@@ -12,6 +12,8 @@
 #include <of.h>
 
 int of_get_nand_ecc_mode(struct device_node *np);
+int of_get_nand_ecc_step_size(struct device_node *np);
+int of_get_nand_ecc_strength(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);
 
-- 
2.1.0


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