mtd: spi-nor: Drop quad_enable() from 'struct spi-nor'

All flash parameters and settings should reside inside
'struct spi_nor_flash_parameter'. Drop the local copy of
quad_enable() and use the one from 'struct spi_nor_flash_parameter'.
Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Vignesh Raghavendra <vigneshr@ti.com>

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

@@ -4403,7 +4403,6 @@ static int spi_nor_setup(struct spi_nor *nor,
 {
 	struct spi_nor_flash_parameter *params = &nor->params;
 	u32 ignored_mask, shared_mask;
-	bool enable_quad_io;
 	int err;
 
 	/*
@@ -4457,15 +4456,25 @@ static int spi_nor_setup(struct spi_nor *nor,
 		return err;
 	}
 
-	/* Enable Quad I/O if needed. */
-	enable_quad_io = (spi_nor_get_protocol_width(nor->read_proto) == 4 ||
-			  spi_nor_get_protocol_width(nor->write_proto) == 4);
-	if (enable_quad_io && params->quad_enable)
-		nor->quad_enable = params->quad_enable;
-	else
-		nor->quad_enable = NULL;
+	return 0;
+}
 
+/**
+ * spi_nor_quad_enable() - enable Quad I/O if needed.
+ * @nor:                pointer to a 'struct spi_nor'
+ *
+ * Return: 0 on success, -errno otherwise.
+ */
+static int spi_nor_quad_enable(struct spi_nor *nor)
+{
+	if (!nor->params.quad_enable)
+		return 0;
+
+	if (!(spi_nor_get_protocol_width(nor->read_proto) == 4 ||
+	      spi_nor_get_protocol_width(nor->write_proto) == 4))
 		return 0;
+
+	return nor->params.quad_enable(nor);
 }
 
 static int spi_nor_init(struct spi_nor *nor)
@@ -4473,7 +4482,7 @@ static int spi_nor_init(struct spi_nor *nor)
 	int err;
 
 	if (nor->clear_sr_bp) {
-		if (nor->quad_enable == spansion_quad_enable)
+		if (nor->params.quad_enable == spansion_quad_enable)
 			nor->clear_sr_bp = spi_nor_spansion_clear_sr_bp;
 
 		err = nor->clear_sr_bp(nor);
@@ -4484,13 +4493,11 @@ static int spi_nor_init(struct spi_nor *nor)
 		}
 	}
 
-	if (nor->quad_enable) {
-		err = nor->quad_enable(nor);
+	err = spi_nor_quad_enable(nor);
 	if (err) {
 		dev_err(nor->dev, "quad mode not supported\n");
 		return err;
 	}
-	}
 
 	if (nor->addr_width == 4 && !(nor->flags & SNOR_F_4B_OPCODES)) {
 		/*
@@ -4706,7 +4713,6 @@ int spi_nor_scan(struct spi_nor *nor, const char *name,
 	 * - select op codes for (Fast) Read, Page Program and Sector Erase.
 	 * - set the number of dummy cycles (mode cycles + wait states).
 	 * - set the SPI protocols for register and memory accesses.
-	 * - set the Quad Enable bit if needed (required by SPI x-y-4 protos).
 	 */
 	ret = spi_nor_setup(nor, hwcaps);
 	if (ret)

include/linux/mtd/spi-nor.h

@@ -535,7 +535,6 @@ struct flash_info;
  * @flash_unlock:	[FLASH-SPECIFIC] unlock a region of the SPI NOR
  * @flash_is_locked:	[FLASH-SPECIFIC] check if a region of the SPI NOR is
  *			completely locked
- * @quad_enable:	[FLASH-SPECIFIC] enables SPI NOR quad mode
  * @clear_sr_bp:	[FLASH-SPECIFIC] clears the Block Protection Bits from
  *			the SPI NOR Status Register.
  * @params:		[FLASH-SPECIFIC] SPI-NOR flash parameters and settings.
@@ -579,7 +578,6 @@ struct spi_nor {
 	int (*flash_lock)(struct spi_nor *nor, loff_t ofs, uint64_t len);
 	int (*flash_unlock)(struct spi_nor *nor, loff_t ofs, uint64_t len);
 	int (*flash_is_locked)(struct spi_nor *nor, loff_t ofs, uint64_t len);
-	int (*quad_enable)(struct spi_nor *nor);
 	int (*clear_sr_bp)(struct spi_nor *nor);
 	struct spi_nor_flash_parameter params;