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https://github.com/brain-hackers/u-boot-brain
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c9dffc9719
This patch changes the functioning of the detection of w1 devices. The old way was a comparison between detected w1 and the ones described in the device tree. Now it will just look for the driver matching the family id of the w1 detected. The patch is inspired from Maxime Ripard code. Signed-off-by: Kory Maincent <kory.maincent@bootlin.com> Reviewed-by: Maxime Ripard <maxime@cerno.tech>
63 lines
1.2 KiB
C
63 lines
1.2 KiB
C
// 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_parent_plat(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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u8 family_supported[] = {
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W1_FAMILY_DS24B33,
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W1_FAMILY_DS2431,
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};
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U_BOOT_W1_DEVICE(ds24xxx, family_supported);
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