1 files changed, 10 insertions, 0 deletions

diff --git a/include/linux/spi/eeprom.h b/include/linux/spi/eeprom.h
index 306e7b1c69ed..403e007aef68 100644
--- a/include/linux/spi/eeprom.h
+++ b/include/linux/spi/eeprom.h
@@ -20,6 +20,16 @@ struct spi_eeprom {
 #define EE_ADDR3        0x0004                  /* 24 bit addrs */
 #define EE_READONLY     0x0008                  /* disallow writes */
 
+        /*
+         * Certain EEPROMS have a size that is larger than the number of address
+         * bytes would allow (e.g. like M95040 from ST that has 512 Byte size
+         * but uses only one address byte (A0 to A7) for addressing.) For
+         * the extra address bit (A8, A16 or A24) bit 3 of the instruction byte
+         * is used. This instruction bit is normally defined as don't care for
+         * other AT25 like chips.
+         */
+#define EE_INSTR_BIT3_IS_ADDR   0x0010
+
         /* for exporting this chip's data to other kernel code */
         void (*setup)(struct memory_accessor *mem, void *context);
         void *context;