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| author | Maxime Ripard <maxime.ripard@free-electrons.com> | 2018-09-18 10:35:29 +0300 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2018-09-28 20:22:35 -0400 |
| commit | 0749f646c3b47b0980716776ccd19158320931a3 (patch) | |
| tree | 4851b87107f34e7e306bfd091a71dd6e96a2f16f /drivers/w1-eeprom | |
| parent | 543b98c85719ff0e5e80e9e18fbcc4dc50a2136b (diff) | |
| download | u-boot-0749f646c3b47b0980716776ccd19158320931a3.zip u-boot-0749f646c3b47b0980716776ccd19158320931a3.tar.gz u-boot-0749f646c3b47b0980716776ccd19158320931a3.tar.bz2 | |
W1-EEPROM: add support for Maxim DS24 eeprom families
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>
Diffstat (limited to 'drivers/w1-eeprom')
| -rw-r--r-- | drivers/w1-eeprom/Kconfig | 6 | ||||
| -rw-r--r-- | drivers/w1-eeprom/Makefile | 2 | ||||
| -rw-r--r-- | drivers/w1-eeprom/ds24xxx.c | 55 |
3 files changed, 63 insertions, 0 deletions
diff --git a/drivers/w1-eeprom/Kconfig b/drivers/w1-eeprom/Kconfig index d5ddc80..20ec549 100644 --- a/drivers/w1-eeprom/Kconfig +++ b/drivers/w1-eeprom/Kconfig @@ -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 diff --git a/drivers/w1-eeprom/Makefile b/drivers/w1-eeprom/Makefile index b72950e..3f4aa13 100644 --- a/drivers/w1-eeprom/Makefile +++ b/drivers/w1-eeprom/Makefile @@ -1,2 +1,4 @@ obj-$(CONFIG_W1_EEPROM) += w1-eeprom-uclass.o +obj-$(CONFIG_W1_EEPROM_DS24XXX) += ds24xxx.o + diff --git a/drivers/w1-eeprom/ds24xxx.c b/drivers/w1-eeprom/ds24xxx.c new file mode 100644 index 0000000..56186e5 --- /dev/null +++ b/drivers/w1-eeprom/ds24xxx.c @@ -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, +}; |