[RFC 1/3] mtd: spi-nor: Add support of read/write any reg commands

[Prabhakar Kushwaha]

Spansion flash provide support of Read Any Register and Write Any
Register commands.  These commands provides a way to read or write
all device registers - non-volatile and volatile.

These commands require special signature and handing from underlying
flash controller.

Signed-off-by: Prabhakar Kushwaha <prabhakar.kushwaha at nxp.com>
---
 include/linux/mtd/spi-nor.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/include/linux/mtd/spi-nor.h b/include/linux/mtd/spi-nor.h
index 1f0a7fc..bd196e3 100644
--- a/include/linux/mtd/spi-nor.h
+++ b/include/linux/mtd/spi-nor.h
@@ -254,6 +254,8 @@ enum spi_nor_option_flags {
  *			read/write/erase/lock/unlock operations
  * @read_reg:		[DRIVER-SPECIFIC] read out the register
  * @write_reg:		[DRIVER-SPECIFIC] write data to the register
+ * @read_anyreg:	[DRIVER-SPECIFIC] read out from any register
+ * @write_anyreg	[DRIVER-SPECIFIC] write data to any register
  * @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
@@ -286,6 +288,10 @@ struct spi_nor {
 	void (*unprepare)(struct spi_nor *nor, enum spi_nor_ops ops);
 	int (*read_reg)(struct spi_nor *nor, u8 opcode, u8 *buf, int len);
 	int (*write_reg)(struct spi_nor *nor, u8 opcode, u8 *buf, int len);
+	int (*read_anyreg)(struct spi_nor *nor, u8 opcode, u32 offset,
+			   u8 *buf, int len);
+	int (*write_anyreg)(struct spi_nor *nor, u8 opcode, u32 offset,
+			    u8 *buf, int len);
 
 	ssize_t (*read)(struct spi_nor *nor, loff_t from,
 			size_t len, u_char *read_buf);
-- 
2.7.4