Hello Francesco, On Wed Nov 26, 2025 at 12:59 PM CET, Francesco Dolcini wrote: > [...] >> - >> - return 0; >> + enable_pwm_clk(1, 0); >> + ret = pwm_init(0, 0, 0); >> + if (ret) >> + return ret; >> + ret = pwm_config(0, 0, 6666666); > > You are setting a period here for the PWM backlight (150Hz?), > considering that colibri imx7 is a SoM, e.g. there is no actual display > part of it, is this number generic enough?
Indeed there isn't, however for my tests I used the Toradex Colibri Evaluation Board with the Toradex 7 inch Capacitive Touch Display [1] that is meant to be used with the Colibri Evaluation Board. This display typically uses a 150Hz PWM for its backlight so I chose this value. However there the pwm_config configure a 150Hz PWM with 0ns duty cycle so in fact, no matter the frequency, this pin will act as an always off GPIO. 1: https://docs.toradex.com/104497-7-inch-parallel-capacitive-touch-display-800x480-datasheet.pdf Thomas
