[U-Boot] [PATCH RESEND 6/9] eeprom: Add DS2431 support

[Maxime Ripard]

Add a driver for the Maxim DS2431 1-Wire EEPROM

Signed-off-by: Maxime Ripard <maxime.ripard at free-electrons.com>
---
 drivers/eeprom/Kconfig  |  6 ++++++
 drivers/eeprom/Makefile |  1 +
 drivers/eeprom/ds2431.c | 38 ++++++++++++++++++++++++++++++++++++++
 3 files changed, 45 insertions(+), 0 deletions(-)
 create mode 100644 drivers/eeprom/ds2431.c

diff --git a/drivers/eeprom/Kconfig b/drivers/eeprom/Kconfig
index 8dc597a8d894..98bbd67ba579 100644
--- a/drivers/eeprom/Kconfig
+++ b/drivers/eeprom/Kconfig
@@ -12,6 +12,12 @@ config EEPROM
 
 if EEPROM
 
+config EEPROM_DS2431
+	bool "Enable Maxim DS2431 EEPROM support"
+	depends on W1
+	help
+	  Maxim DS2431 1-Wire EEPROM support
+
 endif
 
 endmenu
diff --git a/drivers/eeprom/Makefile b/drivers/eeprom/Makefile
index 147dba5ec4b8..93dae0bf5d6d 100644
--- a/drivers/eeprom/Makefile
+++ b/drivers/eeprom/Makefile
@@ -1,2 +1,3 @@
 obj-$(CONFIG_EEPROM) += eeprom-uclass.o
 
+obj-$(CONFIG_EEPROM_DS2431) += ds2431.o
diff --git a/drivers/eeprom/ds2431.c b/drivers/eeprom/ds2431.c
new file mode 100644
index 000000000000..84c1a126c339
--- /dev/null
+++ b/drivers/eeprom/ds2431.c
@@ -0,0 +1,38 @@
+/*
+ * Copyright (c) 2015 Free Electrons
+ * Copyright (c) 2015 NextThing Co
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <linux/err.h>
+#include <dm.h>
+#include <eeprom.h>
+#include <w1.h>
+
+#define W1_F2D_READ_EEPROM	0xf0
+
+static int ds2431_read_buf(struct udevice *dev, unsigned offset,
+			   u8 *buf, unsigned count)
+{
+	w1_reset_select(dev);
+
+	w1_write_byte(dev, W1_F2D_READ_EEPROM);
+	w1_write_byte(dev, offset & 0xff);
+	w1_write_byte(dev, offset >> 8);
+
+	return w1_read_buf(dev, buf, count);
+}
+
+static const struct eeprom_ops ds2431_ops = {
+	.read_buf	= ds2431_read_buf,
+};
+
+U_BOOT_DRIVER(ds2431) = {
+	.name		= "ds2431",
+	.id		= UCLASS_EEPROM,
+	.ops		= &ds2431_ops,
+};
+
+U_BOOT_W1_DEVICE(ds2431, W1_FAMILY_DS2431);
-- 
git-series 0.8.11