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W1-EEPROM: add support for Maxim DS24 eeprom families

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Add a driver that supports Maxim 1 wire EEPROMs families
DS24B33 and DS2431.
Can be extended for other families as well.

Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
[eugen.hristev@microchip.com: reworked driver]
Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
This commit is contained in:
Maxime Ripard 2018-09-18 10:35:29 +03:00 committed by Tom Rini
parent 543b98c857
commit 0749f646c3
3 changed files with 63 additions and 0 deletions
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6
drivers/w1-eeprom/Kconfig
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@ -12,6 +12,12 @@ config W1_EEPROM
if W1_EEPROM
config W1_EEPROM_DS24XXX
bool "Enable Maxim DS24 families EEPROM support"
depends on W1
help
Maxim DS24 EEPROMs 1-Wire EEPROM support
endif
endmenu

2
drivers/w1-eeprom/Makefile
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@ -1,2 +1,4 @@
obj-$(CONFIG_W1_EEPROM) += w1-eeprom-uclass.o
obj-$(CONFIG_W1_EEPROM_DS24XXX) += ds24xxx.o

55
drivers/w1-eeprom/ds24xxx.c Normal file
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@ -0,0 +1,55 @@
// SPDX-License-Identifier: GPL-2.0+
/*
*
* Copyright (c) 2015 Free Electrons
* Copyright (c) 2015 NextThing Co
* Copyright (c) 2018 Microchip Technology, Inc.
*
*/
#include <common.h>
#include <linux/err.h>
#include <dm.h>
#include <w1-eeprom.h>
#include <w1.h>
#define W1_F2D_READ_EEPROM 0xf0
static int ds24xxx_read_buf(struct udevice *dev, unsigned int offset,
u8 *buf, unsigned int 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 int ds24xxx_probe(struct udevice *dev)
{
struct w1_device *w1;
w1 = dev_get_platdata(dev);
w1->id = 0;
return 0;
}
static const struct w1_eeprom_ops ds24xxx_ops = {
.read_buf = ds24xxx_read_buf,
};
static const struct udevice_id ds24xxx_id[] = {
{ .compatible = "maxim,ds24b33", .data = W1_FAMILY_DS24B33 },
{ .compatible = "maxim,ds2431", .data = W1_FAMILY_DS2431 },
{ },
};
U_BOOT_DRIVER(ds24xxx) = {
.name = "ds24xxx",
.id = UCLASS_W1_EEPROM,
.of_match = ds24xxx_id,
.ops = &ds24xxx_ops,
.probe = ds24xxx_probe,
};