mtd: spi-nor: Add a default_init() fixup hook for gd25q256

gd25q256 needs to tweak the ->quad_enable() implementation and the
->default_init() fixup hook is the perfect place to do that. This way,
if we ever need to tweak more things for this flash, we won't have to
add new fields in flash_info.

We can get rid of the flash_info->quad_enable field as gd25q256 was
the only user.
Signed-off-by: NBoris Brezillon <boris.brezillon@bootlin.com>
[tudor.ambarus@microchip.com: use ->default_init() hook instead of
->post_sfdp()]
Signed-off-by: NTudor Ambarus <tudor.ambarus@microchip.com>
Reviewed-by: NVignesh Raghavendra <vigneshr@ti.com>

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

@@ -222,8 +222,6 @@ struct flash_info {
 
 	/* Part specific fixup hooks. */
 	const struct spi_nor_fixups *fixups;
-
-	int	(*quad_enable)(struct spi_nor *nor);
 };
 
 #define JEDEC_MFR(info)	((info)->id[0])
@@ -2126,6 +2124,21 @@ static struct spi_nor_fixups mx25l25635_fixups = {
 	.post_bfpt = mx25l25635_post_bfpt_fixups,
 };
 
+static void gd25q256_default_init(struct spi_nor *nor)
+{
+	/*
+	 * 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
+	 * to set it in the default_init fixup hook.
+	 */
+	nor->params.quad_enable = macronix_quad_enable;
+}
+
+static struct spi_nor_fixups gd25q256_fixups = {
+	.default_init = gd25q256_default_init,
+};
+
 /* NOTE: double check command sets and memory organization when you add
  * more nor chips.  This current list focusses on newer chips, which
  * have been converging on command sets which including JEDEC ID.
@@ -2218,7 +2231,7 @@ static const struct flash_info spi_nor_ids[] = {
 		"gd25q256", INFO(0xc84019, 0, 64 * 1024, 512,
 			SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ |
 			SPI_NOR_4B_OPCODES | SPI_NOR_HAS_LOCK | SPI_NOR_HAS_TB)
-			.quad_enable = macronix_quad_enable,
+			.fixups = &gd25q256_fixups,
 	},
 
 	/* Intel/Numonyx -- xxxs33b */
@@ -4237,15 +4250,6 @@ 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;
 	}
 
 	spi_nor_manufacturer_init_params(nor);