[RFC 1/4] mtd: spinand: Add support continuous read mode

[Zhengxun]

The patch supports setting the "CONT" bit of the configuration
register and adding a continuous read mode flag for identification.

Signed-off-by: Zhengxun <zhengxunli.mxic at gmail.com>
---
 drivers/mtd/nand/spi/core.c | 11 +++++++++++
 include/linux/mtd/spinand.h |  2 ++
 2 files changed, 13 insertions(+)

diff --git a/drivers/mtd/nand/spi/core.c b/drivers/mtd/nand/spi/core.c
index e5330958c7..88d07b625d 100644
--- a/drivers/mtd/nand/spi/core.c
+++ b/drivers/mtd/nand/spi/core.c
@@ -216,6 +216,17 @@ static int spinand_init_quad_enable(struct spinand_device *spinand)
 			       enable ? CFG_QUAD_ENABLE : 0);
 }
 
+static int spinand_continuous_read_enable(struct spinand_device *spinand)
+{
+	return spinand_upd_cfg(spinand, CFG_CONT_READ_ENABLE,
+			       CFG_CONT_READ_ENABLE);
+}
+
+static int spinand_continuous_read_disable(struct spinand_device *spinand)
+{
+	return spinand_upd_cfg(spinand, CFG_CONT_READ_ENABLE, 0);
+}
+
 static int spinand_ecc_enable(struct spinand_device *spinand,
 			      bool enable)
 {
diff --git a/include/linux/mtd/spinand.h b/include/linux/mtd/spinand.h
index 15bcd59f34..e6a5478b0a 100644
--- a/include/linux/mtd/spinand.h
+++ b/include/linux/mtd/spinand.h
@@ -131,6 +131,7 @@
 #define REG_CFG			0xb0
 #define CFG_OTP_ENABLE		BIT(6)
 #define CFG_ECC_ENABLE		BIT(4)
+#define CFG_CONT_READ_ENABLE	BIT(2)
 #define CFG_QUAD_ENABLE		BIT(0)
 
 /* status register */
@@ -247,6 +248,7 @@ struct spinand_ecc_info {
 
 #define SPINAND_HAS_QE_BIT		BIT(0)
 #define SPINAND_HAS_CR_FEAT_BIT		BIT(1)
+#define SPINAND_HAS_CONT_READ_BIT	BIT(2)
 
 /**
  * struct spinand_info - Structure used to describe SPI NAND chips
-- 
2.17.1