dm: Add a simple EEPROM driver

There seem to be a few EEPROM drivers around - perhaps we should have a
single standard one? This simple driver is used for sandbox testing, but
could be pressed into more active service.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Heiko Schocher <hs@denx.de>
Reviewed-by: Masahiro Yamada <yamada.m@jp.panasonic.com>

include/dm/uclass-id.h

@@ -32,6 +32,7 @@ enum uclass_id {
 	UCLASS_THERMAL,		/* Thermal sensor */
 	UCLASS_I2C,		/* I2C bus */
 	UCLASS_I2C_GENERIC,	/* Generic I2C device */
+	UCLASS_I2C_EEPROM,	/* I2C EEPROM device */
 
 	UCLASS_COUNT,
 	UCLASS_INVALID = -1,

include/i2c_eeprom.h

@@ -0,0 +1,19 @@
+/*
+ * Copyright (c) 2014 Google, Inc
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef __I2C_EEPROM
+#define __I2C_EEPROM
+
+struct i2c_eeprom_ops {
+	int (*read)(struct udevice *dev, int offset, uint8_t *buf, int size);
+	int (*write)(struct udevice *dev, int offset, const uint8_t *buf,
+		     int size);
+};
+
+struct i2c_eeprom {
+};
+
+#endif