[PATCH v3 3/9] of: mtd: add NAND timing mode retrieval support

Boris BREZILLON
2014-03-12T18:07:38Z

Add a function to retrieve NAND timing mode (ONFI timing mode) from a given
DT node.

Signed-off-by: Boris BREZILLON <b.brezillon.dev-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
drivers/of/of_mtd.c | 19 +++++++++++++++++++
include/linux/of_mtd.h | 8 ++++++++
2 files changed, 27 insertions(+)

diff --git a/drivers/of/of_mtd.c b/drivers/of/of_mtd.c
index b7361ed..8bdaa0b 100644
--- a/drivers/of/of_mtd.c
+++ b/drivers/of/of_mtd.c
@@ -117,3 +117,22 @@ 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);
+
+/**
+ * of_get_nand_timings - Get nand timings for the given device_node
+ * @np: Pointer to the given device_node
+ *
+ * return 0 on success errno other wise
+ */
+int of_get_nand_onfi_timing_mode(struct device_node *np)
+{
+ int err;
+ u32 mode;
+
+ err = of_property_read_u32(np, "onfi,nand-timing-mode", &mode);
+ if (err)
+ return err;
+
+ return mode;
+}
+EXPORT_SYMBOL_GPL(of_get_nand_onfi_timing_mode);
diff --git a/include/linux/of_mtd.h b/include/linux/of_mtd.h
index e266caa..c8310ae 100644
--- a/include/linux/of_mtd.h
+++ b/include/linux/of_mtd.h
@@ -9,6 +9,8 @@
#ifndef __LINUX_OF_MTD_H
#define __LINUX_OF_MTD_H

+#include <linux/mtd/nand.h>
+
#ifdef CONFIG_OF_MTD

#include <linux/of.h>
@@ -17,6 +19,7 @@ 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);
+int of_get_nand_onfi_timing_mode(struct device_node *np);

#else /* CONFIG_OF_MTD */

@@ -45,6 +48,11 @@ static inline bool of_get_nand_on_flash_bbt(struct device_node *np)
return false;
}

+static inline int of_get_nand_onfi_timing_mode(struct device_node *np)
+{
+ return -ENOSYS;
+}
+
#endif /* CONFIG_OF_MTD */

#endif /* __LINUX_OF_MTD_H */
--
1.7.9.5