Sometimes enumeration fails (about 1 in 50 times on my custom board).
The underlying reason is probably electrical but Linux does not have
the problem.
Comparing the Linux / u-boot implementations shows that Linux
retries the error case whereas u-boot aborts early.
Removing the early abort in u-boot fixes the problem.
Signed-off-by: Martin Fuzzey <martin.fuzzey@flowbird.group>
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 <martin.fuzzey@flowbird.group>
Reviewed-by: Eugen Hristev <eugen.hristev@microchip.com>
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 <eugen.hristev@microchip.com>
Add a bus driver for bitbanging a 1-Wire bus over a GPIO.
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
[eugen.hristev@microchip.com: fixed some issues]
Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
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>
