viteo

i've managed to create DRM driver for that display. https://lore.kernel.org/linux-devicetree/20230807121022.1871-2-viteosen@gmail.com/ that was impressive jouney pcd8544.c pcd8544-drm-spi.dts

Guys, I'm lookig for your help again. Trying to start this display with TinyDRM. The module I looking for is `panel-mipi-dbi`. I've built Armbian with this module enabled. Edited my dts as follows: /dts-v1/; /plugin/; / { compatible = "allwinner,sun8i-h3"; fragment@0 { target = <&pio>; __overlay__ { display_pins: display_pins { pins = "PA1", "PA3", "PA2"; /*RESET, DC_RS*/ function = "gpio_out", "gpio_out", "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 */ num-chipselects = <1>; panel: panel@0 { compatible = "pcd8544", "panel-mipi-dbi-spi"; reg = <0>; spi-max-frequency = <4000000>; dc-gpios = <&pio 0 3 0>; /*DC_RS=PA3*/ reset-gpios = <&pio 0 1 1>; /*RESET=PA1*/ /*led-gpios = <&pio 0 2 0>; /*LED=PA2*/ write-only; width-mm = <35>; height-mm = <27>; panel-timing { hactive = <84>; vactive = <48>; hback-porch = <0>; vback-porch = <0>; clock-frequency = <0>; hfront-porch = <0>; hsync-len = <0>; vfront-porch = <0>; vsync-len = <0>; }; }; }; }; }; Tried both variants with `<&pio>` target and without. Double checked aliases Also added firmware `pcd8544.bin` to /lib/firmware command 0x21 # Function set command 0x04 # Temperature control (0) command 0x17 # Bias system (4) command 0x22 # Function set command 0x0C # Display control But no luck again. Module is not loaded, dmesg tells nothing =/ Also found this topic, but my display is still blank.

oh. i've looked at your reply and something catched my eye. it's not `pdc8544` it's `pcd8544` I was copypasting this alias string from internet for three days.. checked modinfo and there: i'm sorry. i'm so dumb. Replaced with right string: compatible = "philips,pcd8544"; It's working now! p.s. i've edited original post for the case someone copy DT code. p.p.s. I'll take a loot at tinydrm, but googleing doen't give much for v6 kernel. if it's not a generic driver, there might not be pcd8544 tinydrm driver.

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.