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authorEzequiel Garcia <ezequiel.garcia@free-electrons.com>2014-02-24 19:24:48 -0300
committerBrian Norris <computersforpeace@gmail.com>2014-03-10 22:42:28 -0700
commit6d9434ebb76157071164b32ad03fbed165c74382 (patch)
treeb457ad39dbac4a9b3a33ab0e1e48e461b4a57a9c /drivers/of
parent4b78fc42f3e3f07687dc27efc1153d29e360afa1 (diff)
downloadop-kernel-dev-6d9434ebb76157071164b32ad03fbed165c74382.zip
op-kernel-dev-6d9434ebb76157071164b32ad03fbed165c74382.tar.gz
of_mtd: Add helpers to get ECC strength and ECC step size
This commit adds simple helpers to obtain the devicetree properties that specify the ECC strength and ECC step size to use on a given NAND controller. Acked-by: Boris BREZILLON <b.brezillon.dev@gmail.com> Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com> Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Diffstat (limited to 'drivers/of')
-rw-r--r--drivers/of/of_mtd.c34
1 files changed, 34 insertions, 0 deletions
diff --git a/drivers/of/of_mtd.c b/drivers/of/of_mtd.c
index a27ec94..b7361ed 100644
--- a/drivers/of/of_mtd.c
+++ b/drivers/of/of_mtd.c
@@ -50,6 +50,40 @@ 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
*
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