Index: linux-3.12.27/arch/arm/mach-at91/board-dt-sam9.c
===================================================================
--- linux-3.12.27.orig/arch/arm/mach-at91/board-dt-sam9.c	2014-08-26 07:12:26.000000000 -0500
+++ linux-3.12.27/arch/arm/mach-at91/board-dt-sam9.c	2014-09-24 09:56:17.283867487 -0500
@@ -25,6 +25,36 @@
 #include "board.h"
 #include "generic.h"
 
+#include <linux/mts_at24.h>
+
+uint8_t mts_id_eeprom[512];
+
+EXPORT_SYMBOL(mts_id_eeprom);
+
+static void mts_id_eeprom_load(struct memory_accessor *macc, void *context)
+{
+	int tmp;
+
+	memset(mts_id_eeprom, 0, sizeof(mts_id_eeprom));
+
+	tmp = macc->read(macc, mts_id_eeprom, 0, sizeof(mts_id_eeprom));
+	if (tmp != sizeof(mts_id_eeprom)) {
+		printk(KERN_ERR "sam9x5: id eeprom read failed: %d\n", tmp);
+	} else {
+		printk(KERN_INFO "sam9x5: read %d bytes from id eeprom\n", tmp);
+	}
+}
+
+struct mts_eeprom_callback id_eeprom_callback = {
+	.address = 0x56,
+	.index = -1,
+	.setup = mts_id_eeprom_load,
+};
+
+struct mts_eeprom_callback* mts_eeprom_callback_lookup[] = {
+	&id_eeprom_callback,
+	NULL
+};
 
 static const struct of_device_id irq_of_match[] __initconst = {
 
Index: linux-3.12.27/drivers/misc/eeprom/at24.c
===================================================================
--- linux-3.12.27.orig/drivers/misc/eeprom/at24.c	2014-08-26 07:12:26.000000000 -0500
+++ linux-3.12.27/drivers/misc/eeprom/at24.c	2014-09-23 11:41:52.470331651 -0500
@@ -24,6 +24,8 @@
 #include <linux/i2c.h>
 #include <linux/i2c/at24.h>
 
+#include <linux/mts_at24.h>
+
 /*
  * I2C EEPROMs from most vendors are inexpensive and mostly interchangeable.
  * Differences between different vendor product lines (like Atmel AT24C or
@@ -473,6 +475,23 @@
 			chip->page_size = be32_to_cpup(val);
 	}
 }
+
+static void at24_get_setup(struct i2c_client *client,
+		struct at24_platform_data *chip)
+{
+	int i;
+
+	for (i = 0; mts_eeprom_callback_lookup[i] != NULL; i++) {
+		if (mts_eeprom_callback_lookup[i]->address == client->addr) {
+			printk(KERN_INFO "%s: found a match for eeprom at %X\n", __func__, client->addr);
+			chip->setup = mts_eeprom_callback_lookup[i]->setup;
+			if (mts_eeprom_callback_lookup[i]->index > -1) {
+				chip->context = (void*)&mts_eeprom_callback_lookup[i]->index;
+			}
+			break;
+		}
+	}
+}
 #else
 static void at24_get_ofdata(struct i2c_client *client,
 		struct at24_platform_data *chip)
@@ -505,12 +524,14 @@
 		 * is recommended anyhow.
 		 */
 		chip.page_size = 1;
+		chip.setup = NULL;
+		chip.context = NULL;
 
 		/* update chipdata if OF is present */
 		at24_get_ofdata(client, &chip);
 
-		chip.setup = NULL;
-		chip.context = NULL;
+		/* see if we have a setup callback */
+		at24_get_setup(client, &chip);
 	}
 
 	if (!is_power_of_2(chip.byte_len))
Index: linux-3.12.27/include/linux/mts_at24.h
===================================================================
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ linux-3.12.27/include/linux/mts_at24.h	2014-09-23 11:41:52.470331651 -0500
@@ -0,0 +1,14 @@
+#ifndef _LINUX_MTSAT24_H
+#define _LINUX_MTSAT24_H
+
+#include <linux/memory.h>
+
+struct mts_eeprom_callback {
+    unsigned short      address;
+    int         index;
+    void		(*setup)(struct memory_accessor *, void *context);
+};
+
+extern struct mts_eeprom_callback* mts_eeprom_callback_lookup[];
+
+#endif /* _LINUX_MTSAT24_H */