Errors were handled only if an I2C transfer timed out
and received a NACK which is very unlikely. This commit
changes the condition such that errors are handled if
an I2C transfer times out or received a NACK.

Signed-off-by: Francois Berder <fberder@outlook.fr>
Reviewed-by: Heiko Schocher <hs@denx.de>

The MVTWSI controller can act either as a master or slave device. When
acting as a master, the FSM is driven by the CPU. As a slave, the FSM is
driven by the bus directly. In what is (apparently) a safety mechanism,
if the bus transitions our FSM in any improper way, the FSM goes to a
"bus error" state (0x00). I could find no documented or experimental way
to get the FSM out of this state, except for a controller reset.

Since U-Boot only uses the MVTWSI controller as a bus master, this
feature only gets in the way: we do not care what happened on the bus
previously as long as the bus is ready for a new transaction. So, when
trying to start a new transaction, check for this state and reset the
controller if necessary.

Note that this should not be confused with the "deblocking" technique
(used by the `i2c reset` command), which involves pulsing SCL repeatedly
if SDA is found to be held low, in an attempt to force the bus back to
an idle state. This patch only resets the controller in case something
else had previously upset it, and (in principle) results in no
externally-observable change in behavior.

Signed-off-by: Sam Edwards <CFSworks@gmail.com>
Reviewed-by: Stefan Roese <sr@denx.de>
Reviewed-by: Heiko Schocher <hs@denx.de>

MT7981 actually uses MediaTek I2C controller v3 instead of v1.
This patch adds support for I2C controller v3 fix fixes the I2C usability
for MT7981.

Signed-off-by: Sam Shih <sam.shih@mediatek.com>
Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>

As the Designware_i2c_pci.c uses ACPI APIs, If some SoCs (StarFive
JH7110) contain Designware i2c and PCI but do not use ACPI,
This file cannot be compiled. So add a new Kconfig for
designware_i2c_pci.c, which depends on ACPIGEN

Signed-off-by: Minda Chen <minda.chen@starfivetech.com>
Reviewed-by: Leo Yu-Chi Liang <ycliang@andestech.com>

gpio_request_list_by_name() returns the number of gpios requested.
Notably it swallows the underlying -ENOENT when the "gpios" property
does not exist.

Update the i2c-gpio driver to check for ret == 0 before trying the new
sda-gpios/scl-gpios properties.

Signed-off-by: Chris Packham <judge.packham@gmail.com>

Signed-off-by: Tom Rini <trini@konsulko.com>

In the current implementation, in case of I2C arbitration lost, a retry is
attempted; the message counter and pointer are reset to the original values
and the I2C xfer process is restart from the beginning.

However the message counter and message pointer are respectively
decremented and incremented by one before attempting any transfer, causing
the 1st transfer not to be actually retried (in case of a single transfer,
nothing is actually retried at all).

This patch fixes this: in case of retry, the 1st transfer is also retried.

Tested on a ZynqMP Kria board, with upstream older u-boot, but the involved
file and underlying logic seem basically the same.

Signed-off-by: Andrea Merello <andrea.merello@iit.it>

Failure can happen when i2c is used without initializing pinctrl properly,
which U-Boot happily allows in SPL. Without this fix, further I2C access would
fail, even after proper pinctrl initialization.

Signed-off-by: Ondrej Jirman <megi@xff.cz>
Cc: Heiko Schocher <hs@denx.de>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
Reviewed-by: Heiko Schocher <hs@denx.de>

This platform is currently unmaintained and untested, so remove it.
Further, as it is the only TI816X SoC example, remove related files as
well.

Signed-off-by: Tom Rini <trini@konsulko.com>

The fdt_addr_t and phys_addr_t size have been decoupled. A 32bit CPU
can expect 64-bit data from the device tree parser, so use
dev_read_addr_ptr instead of the dev_read_addr function in the
various files in the drivers directory that cast to a pointer.
As we are there also streamline the error response to -EINVAL on return.

Signed-off-by: Johan Jonker <jbx6244@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>