Hi NXP,
Hi, I am working on board imx93evk, I want to control LVDS brightness with I2c, the base board I2C device is ADP5585ACxZ-01-R7 at address 0x34 pin LVDS_BLT_PWM, I have data sheet for ADP5585ACxZ but I don't know much about how to use this i2c device And how to control LVDS brightness using this device. Please provide example with document if possible.
I want output about pwm on pin R3 LVDS_BLT_PWM
Hello @Rakesh_Kumar-Thakur
I hope you are doing very well.
Please take a look to the imx93-11x11-evk-boe-wxga-lvds-panel.dts on the kernel git.
There you can see the node called lvds_backlight: lvds_backlight:
lvds_backlight: lvds_backlight {
compatible = "pwm-backlight";
pwms = <&adp5585pwm 0 100000 0>;
enable-gpios = <&adp5585gpio 8 GPIO_ACTIVE_HIGH>;
power-supply = <®_vdd_12v>;
status = "okay";
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 = <80>;
};
You can see the pwms property is calling to the node adp5585pwm defined on imx93-11x11-evk.dts. Pin 3 (R3 of the adp5585).
The default brightness level is 80 and you can change it on user space:
root@imx93evk:/sys/class/backlight/lvds_backlight# echo 90 > brightness
root@imx93evk:/sys/class/backlight/lvds_backlight# echo 100 > brightness
root@imx93evk:/sys/class/backlight/lvds_backlight# echo 50 > brightness
I hope this information can helps to you!
Best regards,
Salas.
