mtd: nand: add a helper to get the supported features for JEDEC
Add a helper to get the supported features for JEDEC compliant NAND.
Also add a macro JEDEC_FEATURE_16_BIT_BUS.
Signed-off-by: Huang Shijie <b32955@freescale.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
index f9af756..afd1cf9b 100644
--- a/include/linux/mtd/nand.h
+++ b/include/linux/mtd/nand.h
@@ -350,6 +350,9 @@
u8 reserved[2];
} __packed;
+/* JEDEC features */
+#define JEDEC_FEATURE_16_BIT_BUS (1 << 0)
+
struct nand_jedec_params {
/* rev info and features block */
/* 'J' 'E' 'S' 'D' */
@@ -925,4 +928,10 @@
return command == NAND_CMD_READID;
}
+/* return the supported JEDEC features. */
+static inline int jedec_feature(struct nand_chip *chip)
+{
+ return chip->jedec_version ? le16_to_cpu(chip->jedec_params.features)
+ : 0;
+}
#endif /* __LINUX_MTD_NAND_H */