LCD screen brightness/contrast

[psychedup]

For the BSP (3.10.x) kernel the PWM output (PL10 according to the schematics) is afaik tied to the LCD driver and there should be some controls in the /sys/ filesystem.

If you look at the device tree:

Pin Config:
https://github.com/longsleep/build-pine6...4.dts#L776

LCD Entry seems to have values too:
https://github.com/longsleep/build-pine6....dts#L1965

PWM Driver entry, from the pinctrl phandle:
https://github.com/longsleep/build-pine6....dts#L2071
from the compatible line it should be tied to a driver called "sunxi-pwm16"

Is this it?

Code:

chris@pinetoo /sys/bus/platform/devices/spwm0.10 $ cat uevent
OF_NAME=spwm0
OF_FULLNAME=/soc@01c00000/spwm0@0x01f03800
OF_TYPE=spwm0
OF_COMPATIBLE_0=allwinner,sunxi-pwm16
OF_COMPATIBLE_N=1
OF_ALIAS_0=spwm0
MODALIAS=of:Nspwm0Tspwm0Callwinner,sunxi-pwm16

If so, how do we set the frequency/brightness?