linux lcd display pricelist

So, we need to add this auxdisplay node in our device tree, and configure it with the pins of the PCF8574A (remember, we declared it as a gpio-controller just before).

By digging into the code — which is not easy to the eyes after passing so much time reading the Linux driver code — we can identify the few defines that identify the screen"s pins by numbers that are the number of the GPIO pin of the expander.

After a try when the screen was displaying some stuff but the backlight was always off (so almost illegible on the white/blue screen variant), I had to change the backlight-gpios node to use GPIO_ACTIVE_LOW in order for the backlight to illuminate the screen at boot.

10.4” High Brightness/Sunlight Readable Capacitive Industrial Touch Monitor, 1000 nits, 1 HDMI input, 1 VGA input, 1 DVI-D input, 1 DisplayPort input, 1 Line-in audio port

12.1” High Brightness/Sunlight Readable Capacitive Industrial Touch Monitor, 1000 nits, 1 HDMI input, 1 VGA input, 1 DVI-D input, 1 DisplayPort input, 1 Line-in audio port

15.0” High Brightness/Sunlight Readable Capacitive Industrial Touch Monitor, 1000 nits, 1 HDMI input, 1 VGA input, 1 DVI-D input, 1 DisplayPort input, 1 Line-in audio port

17.0” High Brightness/Sunlight Readable Capacitive Industrial Touch Monitor, 1000 nits, 1 HDMI input, 1 VGA input, 1 DVI-D input, 1 DisplayPort input, 1 Line-in audio port

21.5” High Brightness/Sunlight Readable Capacitive Industrial Touch Monitor, 1000 nits, 1 HDMI input, 1 VGA input, 1 DVI-D input, 1 DisplayPort input, 1 Line-in audio port