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 | 46 +++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 54 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..423aa99 --- /dev/null +++ b/drivers/w1-eeprom/ds24xxx.c @@ -0,0 +1,46 @@ +/* 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 const struct w1_eeprom_ops ds24xxx_ops = { + .read_buf = ds24xxx_read_buf, +}; + +U_BOOT_DRIVER(ds24b33) = { + .name = "ds24b33", + .id = UCLASS_W1_EEPROM, + .ops = &ds24xxx_ops, +}; + +U_BOOT_DRIVER(ds2431) = { + .name = "ds2431", + .id = UCLASS_W1_EEPROM, + .ops = &ds24xxx_ops, +}; + +U_BOOT_W1_DEVICE(ds24b33, W1_FAMILY_DS24B33); +U_BOOT_W1_DEVICE(ds2431, W1_FAMILY_DS2431);