This reverts commit d3b74c3.

We ought to replace this bespoke patch with a direct cherry-pick from
upstream main

The lp5569 controller contains an internal charge pump which can be useful
for driving LEDs with a forward voltage greater than the lp5569 supply.
Taking advantage of the charge pump can alleviate the need for an external
boost converter.

Add a dts property, charge-pump-mode, to the ti,lp5569 binding with which
the cp_mode bits of the MISC register will be configured.

Following the datasheet, the possible configurations are:
    0x00 -> disabled (default)
    0x01 -> 1x mode
    0x10 -> 1.5x mode
    0x11 -> auto mode

Signed-off-by: Emil Juhl <[email protected]>
(cherry picked from commit 47f9040)

The lp5569 features a double functioning pin for enable and pwm control.
The chip, however, uses the first rising edge to initialize and get ready
for i2c communication, and then the pin alters function to pwm mode.

Add support for providing enable-gpios to the lp5569 in the dts, which
will make sure to assert the pin and wait for the chip to initialize
before attempting further configuration of the chip.

Signed-off-by: Emil Juhl <[email protected]>
(cherry picked from commit f53a401)

Run clang-format on drivers/led/lp5569.c to align formatting in the file.

No functional changes intended.

Signed-off-by: Emil Dahl Juhl <[email protected]>
(cherry picked from commit bc5477a)

The lp5569 controller supports auto-increment for its registers. This is by
default enabled in the chip, but the driver actively disabled it.

Since auto-increment is useful for writing multiple consecutive registers,
enable the feature. The driver, however, doesn't perform such consecutive
writes and thus the existing behavior is not altered.

Signed-off-by: Emil Dahl Juhl <[email protected]>
(cherry picked from commit 45744b4)

The lp5569 has multiple pwm outputs, and thus implementing the
write_channels api to set multiple values in a single call makes sense.

Implement the write_channels function with a basic range check on the
channel range.
Since the lp5569 supports auto-increment, all of the channels can be
written in one i2c transfer, starting from the pwm register of the
start_channel.

Signed-off-by: Emil Dahl Juhl <[email protected]>
(cherry picked from commit d6ac9e8)