mtd: spi-nor: add a quad_enable callback in struct flash_info

Some manufacturers may use different bit to set QE on different
memories.

The GD25Q256 from GigaDevice is an example, which uses S6(bit 6
of the Status Register-1) to set QE, which is different with
other supported memories from GigaDevice that use S9(bit 1 of
the Status Register-2). This makes it is impossible to select
the quad enable method by distinguishing the MFR. This patch
introduce a quad_enable function which can be set per memory
in the flash_info list table.
Signed-off-by: NAndy Yan <andy.yan@rock-chips.com>
Signed-off-by: NCyrille Pitchen <cyrille.pitchen@wedev4u.fr>

drivers/mtd/spi-nor/spi-nor.c

@@ -89,6 +89,8 @@ struct flash_info {
 #define NO_CHIP_ERASE		BIT(12) /* Chip does not support chip erase */
 #define SPI_NOR_SKIP_SFDP	BIT(13)	/* Skip parsing of SFDP tables */
 #define USE_CLSR		BIT(14)	/* use CLSR command */
+
+	int	(*quad_enable)(struct spi_nor *nor);
 };
 
 #define JEDEC_MFR(info)	((info)->id[0])
@@ -2426,6 +2428,15 @@ static int spi_nor_init_params(struct spi_nor *nor,
 			params->quad_enable = spansion_quad_enable;
 			break;
 		}
+
+		/*
+		 * Some manufacturer like GigaDevice may use different
+		 * bit to set QE on different memories, so the MFR can't
+		 * indicate the quad_enable method for this case, we need
+		 * set it in flash info list.
+		 */
+		if (info->quad_enable)
+			params->quad_enable = info->quad_enable;
 	}
 
 	/* Override the parameters with data read from SFDP tables. */