From: Maxime Ripard maxime.ripard@free-electrons.com
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 --- drivers/w1-eeprom/Kconfig | 6 +++++ drivers/w1-eeprom/Makefile | 2 ++ drivers/w1-eeprom/ds24xxx.c | 55 +++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 63 insertions(+) create mode 100644 drivers/w1-eeprom/ds24xxx.c
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, +};