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| author | Maxime Ripard <maxime.ripard@free-electrons.com> | 2018-09-18 10:35:24 +0300 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2018-09-28 20:22:34 -0400 |
| commit | d3e19cf9195e7308c6333bbbbc12f8db8fa2d079 (patch) | |
| tree | 96c9b9583e2c5f2b59bd142e89f7fb9e73702196 /include | |
| parent | 620300043c95cc695585748ba6ef79da8b8095eb (diff) | |
| download | u-boot-d3e19cf9195e7308c6333bbbbc12f8db8fa2d079.zip u-boot-d3e19cf9195e7308c6333bbbbc12f8db8fa2d079.tar.gz u-boot-d3e19cf9195e7308c6333bbbbc12f8db8fa2d079.tar.bz2 | |
w1: Add 1-Wire uclass
We might want to use 1-Wire devices connected on boards such as EEPROMs in
U-Boot.
Provide a framework to be able to do that.
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
[eugen.hristev@microchip.com: reworked]
Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/dm/uclass-id.h | 1 | ||||
| -rw-r--r-- | include/w1.h | 36 |
2 files changed, 37 insertions, 0 deletions
diff --git a/include/dm/uclass-id.h b/include/dm/uclass-id.h index 10d2990..fcfc120 100644 --- a/include/dm/uclass-id.h +++ b/include/dm/uclass-id.h @@ -93,6 +93,7 @@ enum uclass_id { UCLASS_VIDEO, /* Video or LCD device */ UCLASS_VIDEO_BRIDGE, /* Video bridge, e.g. DisplayPort to LVDS */ UCLASS_VIDEO_CONSOLE, /* Text console driver for video device */ + UCLASS_W1, /* Dallas 1-Wire bus */ UCLASS_WDT, /* Watchdot Timer driver */ UCLASS_COUNT, diff --git a/include/w1.h b/include/w1.h new file mode 100644 index 0000000..b36e0f8 --- /dev/null +++ b/include/w1.h @@ -0,0 +1,36 @@ +/* SPDX-License-Identifier: GPL-2.0+ + * + * Copyright (c) 2015 Free Electrons + * Copyright (c) 2015 NextThing Co + * + */ + +#ifndef __W1_H +#define __W1_H + +#include <dm.h> + +#define W1_FAMILY_DS24B33 0x23 +#define W1_FAMILY_DS2431 0x2d + +struct w1_device { + u64 id; +}; + +struct w1_ops { + u8 (*read_byte)(struct udevice *dev); + bool (*reset)(struct udevice *dev); + u8 (*triplet)(struct udevice *dev, bool bdir); + void (*write_byte)(struct udevice *dev, u8 byte); +}; + +int w1_get_bus(int busnum, struct udevice **busp); +u8 w1_get_device_family(struct udevice *dev); + +int w1_read_buf(struct udevice *dev, u8 *buf, unsigned int count); +int w1_read_byte(struct udevice *dev); +int w1_reset_select(struct udevice *dev); +int w1_write_buf(struct udevice *dev, u8 *buf, unsigned int count); +int w1_write_byte(struct udevice *dev, u8 byte); + +#endif |