PWM using I2C with ADP5585

Rakesh_Kumar-Thakur — Fri, 15 Nov 2024 09:51:46 GMT

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

Screenshot from 2024-10-21 18-07-03.png

Re: PWM using I2C with ADP5585

Manuel_Salas — Fri, 15 Nov 2024 18:35:24 GMT

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 = <&reg_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

Alejandro_Salas_0-1731695583736.png

root@imx93evk:/sys/class/backlight/lvds_backlight# echo 100 > brightness

Alejandro_Salas_1-1731695629280.png

root@imx93evk:/sys/class/backlight/lvds_backlight# echo 50 > brightness

Alejandro_Salas_2-1731695667674.png

I hope this information can helps to you!

Best regards,

Salas.

Re: PWM using I2C with ADP5585

Rakesh_Kumar-Thakur — Fri, 29 Nov 2024 12:08:53 GMT

Hi @Manuel_Salas

thank you so much for very use full support

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