mtd: spi-nor: Add support for Infineon s25fs256t

Infineon S25FS256T is 256Mbit Quad SPI NOR flash. The key features and
differences comparing to other Spansion/Cypress flash familes are:
  - 4-byte address mode by factory default
  - Quad mode is enabled by factory default
  - Supports mixture of 128KB and 64KB sectors by OTP configuration
    (this patch supports uniform 128KB only)

Signed-off-by: Takahiro Kuwano <Takahiro.Kuwano@infineon.com>
Reviewed-by: Jagan Teki <jagan@amarulasolutions.com>
diff --git a/drivers/mtd/spi/spi-nor-ids.c b/drivers/mtd/spi/spi-nor-ids.c
index 5f8f3ec..a862fbd 100644
--- a/drivers/mtd/spi/spi-nor-ids.c
+++ b/drivers/mtd/spi/spi-nor-ids.c
@@ -294,6 +294,8 @@
 		USE_CLSR) },
 	{ INFO6("s25hs02gt",  0x342b1c, 0x0f0090, 256 * 1024, 1024,
 		SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ | SPI_NOR_4B_OPCODES) },
+	{ INFO6("s25fs256t",  0x342b19, 0x0f0890, 128 * 1024, 256,
+		SPI_NOR_QUAD_READ | SPI_NOR_4B_OPCODES) },
 #ifdef CONFIG_SPI_FLASH_S28HX_T
 	{ INFO("s28hl512t",  0x345a1a,      0, 256 * 1024, 256, SPI_NOR_OCTAL_DTR_READ) },
 	{ INFO("s28hl01gt",  0x345a1b,      0, 256 * 1024, 512, SPI_NOR_OCTAL_DTR_READ) },