u-boot.git/drivers/w1, branch v2018.11

w1: fix data abort if no one wire bus master present

2018-11-01T14:02:10+00:00

When the "w1 bus" command is used with no bus master present
a data abort may occur.

This is because uclass_first_device() returns zero, but sets the output
struct udevice pointer to NULL in the no device found case.

Fix w1_get_bus() to account for this and return an error code
as is expected by the callers.

Signed-off-by: Martin Fuzzey 
Reviewed-by: Eugen Hristev

w1: identify devices with w1-eeprom uclass

2018-09-29T00:22:35+00:00

When a new device is discovered, this may be a w1 eeprom device.
Attempt to find the proper node and driver from the w1-eeprom subsystem.

Signed-off-by: Eugen Hristev

w1: Add 1-Wire gpio driver

2018-09-29T00:22:34+00:00

Add a bus driver for bitbanging a 1-Wire bus over a GPIO.

Signed-off-by: Maxime Ripard 
[eugen.hristev@microchip.com: fixed some issues]
Signed-off-by: Eugen Hristev

w1: Add 1-Wire uclass

2018-09-29T00:22:34+00:00

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 
[eugen.hristev@microchip.com: reworked]
Signed-off-by: Eugen Hristev