Hi,
I'm trying to activate an LCD display but the backlight won't turn on - actually /sys/class/backlight is empty. I assume that it is a device tree problem?
device tree:
aliases {
backlight: backlight {
compatible = "pwm-backlight";
pwms = <&pwm2 0 500000 PWM_POLARITY_INVERTED>;
power-supply = <®_lcd1_pwr>;
/*
* a poor man's way to create a 1:1 relationship between
* the PWM value and the actual duty cycle
*/
brightness-levels = < 0 1 2 3 4 5 6 7 8 9
10 11 12 13 14 15 16 17 18 19
20 21 22 23 24 25 26 27 28 29
30 31 32 33 34 35 36 37 38 39
40 41 42 43 44 45 46 47 48 49
50 51 52 53 54 55 56 57 58 59
60 61 62 63 64 65 66 67 68 69
70 71 72 73 74 75 76 77 78 79
80 81 82 83 84 85 86 87 88 89
90 91 92 93 94 95 96 97 98 99
100>;
default-brightness-level = <50>;
};
dits:
aliases {
pwm0 = &pwm1;
pwm1 = &pwm2;
pinctrl_pwm2: pwm2grp {
fsl,pins = <
MX6QDL_PAD_GPIO_1__PWM2_OUT 0x1b0b1
>;
};
&pwm2 {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_pwm2>;
#pwm-cells = <3>;
status = "okay";
};
pwm2: pwm@02084000 {
#pwm-cells = <2>;
compatible = "fsl,imx6q-pwm", "fsl,imx27-pwm";
reg = <0x02084000 0x4000>;
interrupts = <0 84 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&clks IMX6QDL_CLK_IPG>,
<&clks IMX6QDL_CLK_PWM2>;
clock-names = "ipg", "per";
status = "disabled";
};
Also tried with status = "okay" on the last bit of code but it doesn't change anything.
Appreciate any help. Thanks!
