mtd: nand: kill the chip->flash_node field

Now that the nand_chip struct directly embeds an mtd_info struct we can
get rid of the ->flash_node field and forward set/get_flash_node requests
to the MTD layer.

As a side effect, we no longer need the mtd_set_of_node() call done in
nand_dt_init().

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

drivers/mtd/nand/nand_base.c

@@ -3945,9 +3945,6 @@ static int nand_dt_init(struct nand_chip *chip)
 	if (!dn)
 		return 0;
 
-	/* MTD can automatically handle DT partitions, etc. */
-	mtd_set_of_node(nand_to_mtd(chip), dn);
-
 	if (of_get_nand_bus_width(dn) == 16)
 		chip->options |= NAND_BUSWIDTH_16;
 

include/linux/mtd/nand.h

@@ -545,7 +545,6 @@ struct nand_buffers {
  *			flash device
  * @IO_ADDR_W:		[BOARDSPECIFIC] address to write the 8 I/O lines of the
  *			flash device.
- * @flash_node:		[BOARDSPECIFIC] device node describing this instance
  * @read_byte:		[REPLACEABLE] read one byte from the chip
  * @read_word:		[REPLACEABLE] read one word from the chip
  * @write_byte:		[REPLACEABLE] write a single byte to the chip on the
@@ -645,8 +644,6 @@ struct nand_chip {
 	void __iomem *IO_ADDR_R;
 	void __iomem *IO_ADDR_W;
 
-	struct device_node *flash_node;
-
 	uint8_t (*read_byte)(struct mtd_info *mtd);
 	u16 (*read_word)(struct mtd_info *mtd);
 	void (*write_byte)(struct mtd_info *mtd, uint8_t byte);
@@ -724,12 +721,12 @@ struct nand_chip {
 static inline void nand_set_flash_node(struct nand_chip *chip,
 				       struct device_node *np)
 {
-	chip->flash_node = np;
+	mtd_set_of_node(&chip->mtd, np);
 }
 
 static inline struct device_node *nand_get_flash_node(struct nand_chip *chip)
 {
-	return chip->flash_node;
+	return mtd_get_of_node(&chip->mtd);
 }
 
 static inline struct nand_chip *mtd_to_nand(struct mtd_info *mtd)