treewide: remove references to CREDITS ...

The CREDITS file was removed from barebox in 2015 by commit 6570288f2d97
("Remove the CREDITS file"). Remove references to it from several files.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

led: pwm: use new pwm_apply_state API ...

To support PWM_POLARITY_INVERTED for PWM LEDs, we need to to use the
apply API.  Do so.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

led: pwm: always initialize PWM LEDs as inactive ...

While the active-low property is respected when setting brightness,
it's ignored when initializing the LED as off in the probe function
and thus LEDs are active on startup. Fix this.

Fixes: 769eb5e7bb ("led: pwm: support active-low property")
Signed-off-by: Ahmad Fatoum <ahmad@a3f.at>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

led: pwm: support active-low property ...

active-low is an optional property to describe PWMs where the LED is wired
to supply rather than ground. Add barebox support for it.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

led: pwm: fail if required max-brightness option is missing ...

If we leave max_value at the default value of zero led_pwm_set above
will divide by zero in do_div. The binding makes max-brightness
a mandatory property, so have the driver treat it as such as well.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

led: pwm: don't test if pointer is smaller than zero ...

of_pwm_request returns either the valid or an error pointer.
Revise the error check to reflect this.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

led: Add pwm-led driver ...

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>