I'm missing something essential.
I have NanoPi Neo v1.4 with Armbian 23.5 Jammy CLI (Linux nanopineo 6.1.30-sunxi). My display is Nokia5110 LCD or PCD8544
With spi-spidev DT I can successfully via `spidev0.0` with `spi-tools`. I.e. I confirm that spi is working.
Now, I studied about DTO and fbtft driver, found that it supports pcd8544.
I wrote this kind of DTO and added it to `armbianEnv.txt`
/*
* Device: LCD5110 (nokia5110) 1.6"(84x48px) SPI display Module PCD8544
* Module Connector
* SDI(MOSI) <- PC0
* SCK <- PC2
* CS <- PC3
* RESET <- PA1
* DC/RS <- PA3
* LED <- PA2
*/
/dts-v1/;
/plugin/;
/ {
compatible = "allwinner,sun8i-h3";
fragment@0 {
target = <&pio>;
__overlay__ {
display_pins: display_pins {
pins = "PA1", "PA3"; /*RESET, DC_RS*/
function = "gpio_out";
};
};
};
fragment@1 {
target = <&spi0>;
__overlay__ {
/* needed to avoid dtc warning */
#address-cells = <1>;
#size-cells = <0>;
status = "okay";
cs-gpios = <&pio 2 3 0>; /* ChipSelect PC3 */
pcd8544: pcd8544@0 {
compatible = "philips,pcd8544";
reg = <0>;
pinctrl-names = "default";
pinctrl-0 = <&display_pins>;
spi-max-frequency = <4000000>;
buswidth = <8>;
fps = <5>;
// led-gpios = <&pio 0 2 1>; /*LED=PA2*/
reset-gpios = <&pio 0 1 1>; /*RESET=PA1*/
dc-gpios = <&pio 0 3 0>; /*DC_RS=PA3*/
};
};
};
};
I'm seeing in serial output `Applying user provided DT overlay sun8i-h3-spi-pdc8544.dtbo`
But...
Thats all.
`dmesg | grep spi` or `dmesg | grep fbtft` is empty.
`lsmod | grep fb` - also nothing.
`ls /dev/fb*` - nope.
If I manually call for `sudo modprobe spi:fb_pcd8544`
this prints into dmesg:
I've tried a lot of different tweaks in DTO, I've tried different releases from download page for my board.
I don't know what am I missing.
Is it somehow related to CLI nature of images?
Why does no fb device apeears?
Any help would be appreciated. Thank you.
