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>

drivers/misc/Makefile

@@ -15,6 +15,7 @@ obj-$(CONFIG_CROS_EC_SANDBOX) += cros_ec_sandbox.o
 obj-$(CONFIG_CROS_EC_SPI) += cros_ec_spi.o
 obj-$(CONFIG_FSL_IIM) += fsl_iim.o
 obj-$(CONFIG_GPIO_LED) += gpio_led.o
+obj-$(CONFIG_I2C_EEPROM) += i2c_eeprom.o
 obj-$(CONFIG_FSL_MC9SDZ60) += mc9sdz60.o
 obj-$(CONFIG_MXC_OCOTP) += mxc_ocotp.o
 obj-$(CONFIG_MXS_OCOTP) += mxs_ocotp.o

drivers/misc/i2c_eeprom.c

@@ -0,0 +1,51 @@
+/*
+ * Copyright (c) 2014 Google, Inc
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <i2c.h>
+#include <i2c_eeprom.h>
+
+static int i2c_eeprom_read(struct udevice *dev, int offset, uint8_t *buf,
+			   int size)
+{
+	return -ENODEV;
+}
+
+static int i2c_eeprom_write(struct udevice *dev, int offset,
+			    const uint8_t *buf, int size)
+{
+	return -ENODEV;
+}
+
+struct i2c_eeprom_ops i2c_eeprom_std_ops = {
+	.read	= i2c_eeprom_read,
+	.write	= i2c_eeprom_write,
+};
+
+int i2c_eeprom_std_probe(struct udevice *dev)
+{
+	return 0;
+}
+
+static const struct udevice_id i2c_eeprom_std_ids[] = {
+	{ .compatible = "i2c-eeprom" },
+	{ }
+};
+
+U_BOOT_DRIVER(i2c_eeprom_std) = {
+	.name		= "i2c_eeprom",
+	.id		= UCLASS_I2C_EEPROM,
+	.of_match	= i2c_eeprom_std_ids,
+	.probe		= i2c_eeprom_std_probe,
+	.priv_auto_alloc_size = sizeof(struct i2c_eeprom),
+	.ops		= &i2c_eeprom_std_ops,
+};
+
+UCLASS_DRIVER(i2c_eeprom) = {
+	.id		= UCLASS_I2C_EEPROM,
+	.name		= "i2c_eeprom",
+};

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