[PATCH v2 2/8] mtd: add a helper to get the supported features for ONFI nand

[Huang Shijie]

From: Huang Shijie <shijie8@xxxxxxxxx>

add a helper to get the supported features for ONFI nand.
Also add the neccessary macros.

Signed-off-by: Huang Shijie <b32955@xxxxxxxxxxxxx>
---
 include/linux/mtd/nand.h |   13 +++++++++++++
 1 files changed, 13 insertions(+), 0 deletions(-)

diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
index 210bf36..122322c 100644
--- a/include/linux/mtd/nand.h
+++ b/include/linux/mtd/nand.h
@@ -202,6 +202,11 @@ typedef enum {
 /* Keep gcc happy */
 struct nand_chip;
 
+/* ONFI features */
+#define ONFI_FEATURE_16_BIT_BUS		(1 << 0)
+#define ONFI_FEATURE_EXT_PARAM_PAGE	(1 << 7)
+#define ONFI_FEATURE_UNKNOWN		(1 << 15)
+
 /* ONFI timing mode, used in both asynchronous and synchronous mode */
 #define ONFI_TIMING_MODE_0		(1 << 0)
 #define ONFI_TIMING_MODE_1		(1 << 1)
@@ -750,6 +755,14 @@ struct platform_nand_chip *get_platform_nandchip(struct mtd_info *mtd)
 	return chip->priv;
 }
 
+/* return the supported features. */
+static inline int onfi_feature(struct nand_chip *chip)
+{
+	if (!chip->onfi_version)
+		return ONFI_FEATURE_UNKNOWN;
+	return le16_to_cpu(chip->onfi_params.features);
+}
+
 /* return the supported asynchronous timing mode. */
 static inline int onfi_get_async_timing_mode(struct nand_chip *chip)
 {
-- 
1.7.1


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