mediatek: more mtd fixes

this fixes full builds when ALL_KMODS is selected

Signed-off-by: John Crispin <john@phrozen.org>

target/linux/mediatek/patches-4.4/0072-mtd-backport-v4.7-0day-patches-from-Boris.patch

@@ -5416,3 +5416,65 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
  
  	/* Initialise write buffer */
  	init_rwsem(&c->wbuf_sem);
+--- a/include/linux/mtd/spi-nor.h
++++ b/include/linux/mtd/spi-nor.h
+@@ -85,6 +85,7 @@
+ #define SR_BP0			BIT(2)	/* Block protect 0 */
+ #define SR_BP1			BIT(3)	/* Block protect 1 */
+ #define SR_BP2			BIT(4)	/* Block protect 2 */
++#define SR_TB			BIT(5)	/* Top/Bottom protect */
+ #define SR_SRWD			BIT(7)	/* SR write protect */
+ 
+ #define SR_QUAD_EN_MX		BIT(6)	/* Macronix Quad I/O */
+@@ -116,6 +117,7 @@
+ 
+ enum spi_nor_option_flags {
+ 	SNOR_F_USE_FSR		= BIT(0),
++	SNOR_F_HAS_SR_TB	= BIT(1),
+ };
+ 
+ /**
+@@ -123,7 +125,6 @@
+  * @mtd:		point to a mtd_info structure
+  * @lock:		the lock for the read/write/erase/lock/unlock operations
+  * @dev:		point to a spi device, or a spi nor controller device.
+- * @flash_node:		point to a device node describing this flash instance.
+  * @page_size:		the page size of the SPI NOR
+  * @addr_width:		number of address bytes
+  * @erase_opcode:	the opcode for erasing a sector
+@@ -143,7 +144,8 @@
+  * @read:		[DRIVER-SPECIFIC] read data from the SPI NOR
+  * @write:		[DRIVER-SPECIFIC] write data to the SPI NOR
+  * @erase:		[DRIVER-SPECIFIC] erase a sector of the SPI NOR
+- *			at the offset @offs
++ *			at the offset @offs; if not provided by the driver,
++ *			spi-nor will send the erase opcode via write_reg()
+  * @flash_lock:		[FLASH-SPECIFIC] lock a region of the SPI NOR
+  * @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
+@@ -154,7 +156,6 @@
+ 	struct mtd_info		mtd;
+ 	struct mutex		lock;
+ 	struct device		*dev;
+-	struct device_node	*flash_node;
+ 	u32			page_size;
+ 	u8			addr_width;
+ 	u8			erase_opcode;
+@@ -184,6 +185,17 @@
+ 	void *priv;
+ };
+ 
++static inline void spi_nor_set_flash_node(struct spi_nor *nor,
++					  struct device_node *np)
++{
++	mtd_set_of_node(&nor->mtd, np);
++}
++
++static inline struct device_node *spi_nor_get_flash_node(struct spi_nor *nor)
++{
++	return mtd_get_of_node(&nor->mtd);
++}
++
+ /**
+  * spi_nor_scan() - scan the SPI NOR
+  * @nor:	the spi_nor structure