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>lime2-spi
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@ -1,2 +1,4 @@ |
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obj-$(CONFIG_W1_EEPROM) += w1-eeprom-uclass.o
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obj-$(CONFIG_W1_EEPROM) += w1-eeprom-uclass.o
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obj-$(CONFIG_W1_EEPROM_DS24XXX) += ds24xxx.o
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// SPDX-License-Identifier: GPL-2.0+
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/*
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* |
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* Copyright (c) 2015 Free Electrons |
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* Copyright (c) 2015 NextThing Co |
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* Copyright (c) 2018 Microchip Technology, Inc. |
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* |
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*/ |
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#include <common.h> |
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#include <linux/err.h> |
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#include <dm.h> |
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#include <w1-eeprom.h> |
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#include <w1.h> |
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#define W1_F2D_READ_EEPROM 0xf0 |
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static int ds24xxx_read_buf(struct udevice *dev, unsigned int offset, |
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u8 *buf, unsigned int count) |
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{ |
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w1_reset_select(dev); |
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w1_write_byte(dev, W1_F2D_READ_EEPROM); |
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w1_write_byte(dev, offset & 0xff); |
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w1_write_byte(dev, offset >> 8); |
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return w1_read_buf(dev, buf, count); |
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} |
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static int ds24xxx_probe(struct udevice *dev) |
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{ |
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struct w1_device *w1; |
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w1 = dev_get_platdata(dev); |
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w1->id = 0; |
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return 0; |
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} |
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static const struct w1_eeprom_ops ds24xxx_ops = { |
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.read_buf = ds24xxx_read_buf, |
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}; |
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static const struct udevice_id ds24xxx_id[] = { |
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{ .compatible = "maxim,ds24b33", .data = W1_FAMILY_DS24B33 }, |
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{ .compatible = "maxim,ds2431", .data = W1_FAMILY_DS2431 }, |
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{ }, |
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}; |
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U_BOOT_DRIVER(ds24xxx) = { |
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.name = "ds24xxx", |
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.id = UCLASS_W1_EEPROM, |
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.of_match = ds24xxx_id, |
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.ops = &ds24xxx_ops, |
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.probe = ds24xxx_probe, |
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}; |
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