[PATCH v2 1/2] mtd: spi-nor: core: add flag for doing optional SFDP

[Esben Haabendal]

A dedicated flag for triggering call to
spi_nor_sfdp_init_params_deprecated() allows enabling optional SFDP read
and parse, with fallback to legacy flash parameters, without having dual,
quad or octal parameters set in the legacy flash parameters.

With this, spi-nor flash parts without SFDP that is replaced with a
different flash NOR flash part that does have SFDP, but shares the same
manufacturer and device ID is easily handled.

Signed-off-by: Esben Haabendal <esben at geanix.com>
---
 drivers/mtd/spi-nor/core.c | 3 ++-
 drivers/mtd/spi-nor/core.h | 1 +
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c
index 3e1f1913536b..1c4d66fc993b 100644
--- a/drivers/mtd/spi-nor/core.c
+++ b/drivers/mtd/spi-nor/core.c
@@ -2933,7 +2933,8 @@ static void spi_nor_init_params_deprecated(struct spi_nor *nor)
 
 	spi_nor_manufacturer_init_params(nor);
 
-	if (nor->info->no_sfdp_flags & (SPI_NOR_DUAL_READ |
+	if (nor->info->no_sfdp_flags & (SPI_NOR_TRY_SFDP |
+					SPI_NOR_DUAL_READ |
 					SPI_NOR_QUAD_READ |
 					SPI_NOR_OCTAL_READ |
 					SPI_NOR_OCTAL_DTR_READ))
diff --git a/drivers/mtd/spi-nor/core.h b/drivers/mtd/spi-nor/core.h
index 442786685515..77f61a984cb3 100644
--- a/drivers/mtd/spi-nor/core.h
+++ b/drivers/mtd/spi-nor/core.h
@@ -535,6 +535,7 @@ struct flash_info {
 	u8 no_sfdp_flags;
 #define SPI_NOR_SKIP_SFDP		BIT(0)
 #define SECT_4K				BIT(1)
+#define SPI_NOR_TRY_SFDP		BIT(2)
 #define SPI_NOR_DUAL_READ		BIT(3)
 #define SPI_NOR_QUAD_READ		BIT(4)
 #define SPI_NOR_OCTAL_READ		BIT(5)

-- 
2.45.2