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[v2,3/5] mtd: nand: add a helper to get the supported features for JEDEC

Message ID 1391839441-21006-4-git-send-email-b32955@freescale.com
State Accepted
Commit 7852f8962f0f022b11fc56d63de06226a9f70d88
Headers show

Commit Message

Huang Shijie Feb. 8, 2014, 6:03 a.m. UTC 
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>
---
 include/linux/mtd/nand.h |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)
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Patch

diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
index 9686390..84cca61 100644
--- a/include/linux/mtd/nand.h
+++ b/include/linux/mtd/nand.h
@@ -350,6 +350,9 @@  struct jedec_ecc_info {
 	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'  */
@@ -921,4 +924,10 @@  static inline int nand_opcode_8bits(unsigned int command)
 	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 */