[PATCH] mtd: spi: Add ISSI QSPI to lightweight SPI flash stack

[Naresh Kumar Ravulapalli]

Add support for reading data or images from ISSI QSPI flash.

Signed-off-by: Naresh Kumar Ravulapalli <nareshkumar.ravulapalli at altera.com>
---
 drivers/mtd/spi/spi-nor-tiny.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/mtd/spi/spi-nor-tiny.c b/drivers/mtd/spi/spi-nor-tiny.c
index 23de64a1520..82c04d9810c 100644
--- a/drivers/mtd/spi/spi-nor-tiny.c
+++ b/drivers/mtd/spi/spi-nor-tiny.c
@@ -220,6 +220,7 @@ static inline int set_4byte(struct spi_nor *nor, const struct flash_info *info,
 		/* Some Micron need WREN command; all will accept it */
 		need_wren = true;
 		fallthrough;
+	case SNOR_MFR_ISSI:
 	case SNOR_MFR_MACRONIX:
 	case SNOR_MFR_WINBOND:
 		if (need_wren)
@@ -433,7 +434,7 @@ static int spi_nor_write_tiny(struct mtd_info *mtd, loff_t to, size_t len,
 	return -ENOTSUPP;
 }
 
-#ifdef CONFIG_SPI_FLASH_MACRONIX
+#if defined(CONFIG_SPI_FLASH_MACRONIX) || defined(CONFIG_SPI_FLASH_ISSI)
 /**
  * macronix_quad_enable() - set QE bit in Status Register.
  * @nor:	pointer to a 'struct spi_nor'
@@ -662,8 +663,9 @@ static int spi_nor_setup(struct spi_nor *nor, const struct flash_info *info,
 	/* Enable Quad I/O if needed. */
 	if (spi_nor_get_protocol_width(nor->read_proto) == 4) {
 		switch (JEDEC_MFR(info)) {
-#ifdef CONFIG_SPI_FLASH_MACRONIX
+#if defined(CONFIG_SPI_FLASH_MACRONIX) || defined(CONFIG_SPI_FLASH_ISSI)
 		case SNOR_MFR_MACRONIX:
+		case SNOR_MFR_ISSI:
 			err = macronix_quad_enable(nor);
 			break;
 #endif
-- 
2.35.3