new kernel regression with fbtft

[rudiratlos]

no, I haven't built my own kernel. When is the new kernel available?

[PhilE]

There is a build of the updated kernel available now using "sudo rpi-update".

[rudiratlos]

I've upgraded to "Linux pump 5.4.64-v7+ #1340 SMP Fri Sep 11 14:09:35 BST 2020 armv7l GNU/Linux" via rpi-update and apt update/upgrade

but display doen't work at all. Looks like that the entry in /boot/config.txt

Code: Select all

dtoverlay=adafruit18_green,dc_pin=9,reset_pin=27,bgr=1,rotate=270,debug=3,verbose=3

doesn't take the dc_pin and reset_pin parameter

Code: Select all

[    7.567535] fbtft: module is from the staging directory, the quality is unknown, you have been warned.
[    7.571131] fb_st7735r: module is from the staging directory, the quality is unknown, you have been warned.
[    7.572169] fbtft_of_value: buswidth = 8
[    7.572179] fbtft_of_value: bpp = 1
[    7.572185] fbtft_of_value: debug = 3
[    7.572192] fbtft_of_value: rotate = 270
[    7.572201] fbtft_of_value: fps = 25
[    7.572270] fb_st7735r spi0.0: fbtft_gamma_parse_str() str=
[    7.572277] fb_st7735r spi0.0: 02 1c 07 12 37 32 29 2d 29 25 2B 39 00 01 03 10
               03 1d 07 06 2E 2C 29 2D 2E 2E 37 3F 00 00 02 10
[    7.572347] fb_st7735r spi0.0: fbtft_request_one_gpio: 'reset' GPIO
[    7.572380] fb_st7735r spi0.0: fbtft_request_one_gpio: 'dc' GPIO
[    7.572406] fb_st7735r spi0.0: fbtft_request_one_gpio: 'rd' GPIO
[    7.572430] fb_st7735r spi0.0: fbtft_request_one_gpio: 'wr' GPIO
[    7.572456] fb_st7735r spi0.0: fbtft_request_one_gpio: 'cs' GPIO
[    7.572480] fb_st7735r spi0.0: fbtft_request_one_gpio: 'latch' GPIO
[    7.572504] fb_st7735r spi0.0: fbtft_request_one_gpio: 'db' GPIO
[    7.572528] fb_st7735r spi0.0: fbtft_request_one_gpio: 'led' GPIO
[    7.572552] fb_st7735r spi0.0: fbtft_request_one_gpio: 'aux' GPIO
[    7.572577] fb_st7735r spi0.0: fbtft_request_one_gpio: 'db' GPIO
[    7.572601] fb_st7735r spi0.0: fbtft_request_one_gpio: 'led' GPIO
[    7.572625] fb_st7735r spi0.0: fbtft_request_one_gpio: 'aux' GPIO
[    7.572649] fb_st7735r spi0.0: fbtft_request_one_gpio: 'db' GPIO
[    7.572673] fb_st7735r spi0.0: fbtft_request_one_gpio: 'led' GPIO
[    7.572698] fb_st7735r spi0.0: fbtft_request_one_gpio: 'aux' GPIO
[    7.572722] fb_st7735r spi0.0: fbtft_request_one_gpio: 'db' GPIO
[    7.572746] fb_st7735r spi0.0: fbtft_request_one_gpio: 'led' GPIO
[    7.572770] fb_st7735r spi0.0: fbtft_request_one_gpio: 'aux' GPIO
[    7.572794] fb_st7735r spi0.0: fbtft_request_one_gpio: 'db' GPIO
[    7.572818] fb_st7735r spi0.0: fbtft_request_one_gpio: 'led' GPIO
[    7.572844] fb_st7735r spi0.0: fbtft_request_one_gpio: 'aux' GPIO
[    7.572868] fb_st7735r spi0.0: fbtft_request_one_gpio: 'db' GPIO
[    7.572892] fb_st7735r spi0.0: fbtft_request_one_gpio: 'led' GPIO
[    7.572916] fb_st7735r spi0.0: fbtft_request_one_gpio: 'aux' GPIO
[    7.572940] fb_st7735r spi0.0: fbtft_request_one_gpio: 'db' GPIO
[    7.572965] fb_st7735r spi0.0: fbtft_request_one_gpio: 'led' GPIO
[    7.572989] fb_st7735r spi0.0: fbtft_request_one_gpio: 'aux' GPIO
[    7.573013] fb_st7735r spi0.0: fbtft_request_one_gpio: 'db' GPIO
[    7.573037] fb_st7735r spi0.0: fbtft_request_one_gpio: 'led' GPIO
[    7.573061] fb_st7735r spi0.0: fbtft_request_one_gpio: 'aux' GPIO
[    7.573086] fb_st7735r spi0.0: fbtft_request_one_gpio: 'db' GPIO
[    7.573110] fb_st7735r spi0.0: fbtft_request_one_gpio: 'led' GPIO
[    7.573134] fb_st7735r spi0.0: fbtft_request_one_gpio: 'aux' GPIO
[    7.573158] fb_st7735r spi0.0: fbtft_request_one_gpio: 'db' GPIO
[    7.573182] fb_st7735r spi0.0: fbtft_request_one_gpio: 'led' GPIO
[    7.573208] fb_st7735r spi0.0: fbtft_request_one_gpio: 'aux' GPIO
[    7.573575] fb_st7735r spi0.0: fbtft_request_one_gpio: 'db' GPIO
[    7.573602] fb_st7735r spi0.0: fbtft_request_one_gpio: 'led' GPIO
[    7.573626] fb_st7735r spi0.0: fbtft_request_one_gpio: 'aux' GPIO
[    7.573650] fb_st7735r spi0.0: fbtft_request_one_gpio: 'db' GPIO
[    7.573674] fb_st7735r spi0.0: fbtft_request_one_gpio: 'led' GPIO
[    7.573699] fb_st7735r spi0.0: fbtft_request_one_gpio: 'aux' GPIO
[    7.573723] fb_st7735r spi0.0: fbtft_request_one_gpio: 'db' GPIO
[    7.573747] fb_st7735r spi0.0: fbtft_request_one_gpio: 'led' GPIO
[    7.573771] fb_st7735r spi0.0: fbtft_request_one_gpio: 'aux' GPIO
[    7.573795] fb_st7735r spi0.0: fbtft_request_one_gpio: 'db' GPIO
[    7.573819] fb_st7735r spi0.0: fbtft_request_one_gpio: 'led' GPIO
[    7.573844] fb_st7735r spi0.0: fbtft_request_one_gpio: 'aux' GPIO
[    7.573868] fb_st7735r spi0.0: fbtft_request_one_gpio: 'db' GPIO
[    7.573892] fb_st7735r spi0.0: fbtft_request_one_gpio: 'led' GPIO
[    7.573916] fb_st7735r spi0.0: fbtft_request_one_gpio: 'aux' GPIO
[    7.573940] fb_st7735r spi0.0: fbtft_request_one_gpio: 'db' GPIO
[    7.573965] fb_st7735r spi0.0: fbtft_request_one_gpio: 'led' GPIO
[    7.573989] fb_st7735r spi0.0: fbtft_request_one_gpio: 'aux' GPIO
[    7.573996] fb_st7735r spi0.0: fbtft_verify_gpios()
[    7.574004] fb_st7735r spi0.0: fbtft_reset()
[    7.704356] fb_st7735r spi0.0: init: write(0x01) 
[    7.704410] fb_st7735r spi0.0: init: mdelay(150)
[    7.854427] fb_st7735r spi0.0: init: write(0x11) 
[    7.854465] fb_st7735r spi0.0: init: mdelay(500)
[    8.354498] fb_st7735r spi0.0: init: write(0xB1) 0x01 0x2C 0x2D 
[    8.354596] fb_st7735r spi0.0: init: write(0xB2) 0x01 0x2C 0x2D 
[    8.354647] fb_st7735r spi0.0: init: write(0xB3) 0x01 0x2C 0x2D 0x01 0x2C 0x2D 
[    8.354700] fb_st7735r spi0.0: init: write(0xB4) 0x07 
[    8.354743] fb_st7735r spi0.0: init: write(0xC0) 0xA2 0x02 0x84 
[    8.354789] fb_st7735r spi0.0: init: write(0xC1) 0xC5 
[    8.354830] fb_st7735r spi0.0: init: write(0xC2) 0x0A 0x00 
[    8.354874] fb_st7735r spi0.0: init: write(0xC3) 0x8A 0x2A 
[    8.354918] fb_st7735r spi0.0: init: write(0xC4) 0x8A 0xEE 
[    8.354962] fb_st7735r spi0.0: init: write(0xC5) 0x0E 
[    8.355002] fb_st7735r spi0.0: init: write(0x20) 
[    8.355027] fb_st7735r spi0.0: init: write(0x3A) 0x05 
[    8.355067] fb_st7735r spi0.0: init: write(0x29) 
[    8.355091] fb_st7735r spi0.0: init: mdelay(100)
[    8.455108] fb_st7735r spi0.0: init: write(0x13) 
[    8.455152] fb_st7735r spi0.0: init: mdelay(10)
[    8.549771] fb_st7735r spi0.0: Display update: 472 kB/s, fps=0
[    8.558155] graphics fb1: fb_st7735r frame buffer, 160x128, 40 KiB video memory, 4 KiB buffer memory, fps=25, spi0.0 at 4 MHz

[rudiratlos]

moving back to 4.19 kernel via

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rpi-update e1050e94821a70b2e4c72b318d6c6c968552e9a2
uname -a
Linux pump 4.19.118-v7+ #1311 SMP Mon Apr 27 14:21:24 BST 2020 armv7l GNU/Linux

it recognizes the dc_pin and reset parameter, display works (with pixel artefacts)

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[    5.407008] fb_st7735r spi0.0: fbtft_request_one_gpio: 'reset-gpios' = GPIO27
[    5.409343] fb_st7735r spi0.0: fbtft_request_one_gpio: 'dc-gpios' = GPIO9

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[    5.403121] fbtft: module is from the staging directory, the quality is unknown, you have been warned.
[    5.406145] fb_st7735r: module is from the staging directory, the quality is unknown, you have been warned.
[    5.406804] fbtft_of_value: buswidth = 8
[    5.406817] fbtft_of_value: bpp = 1
[    5.406821] fbtft_of_value: debug = 3
[    5.406828] fbtft_of_value: rotate = 270
[    5.406833] fbtft_of_value: fps = 25
[    5.406922] fb_st7735r spi0.0: fbtft_gamma_parse_str() str=
[    5.406927] fb_st7735r spi0.0: 02 1c 07 12 37 32 29 2d 29 25 2B 39 00 01 03 10
               03 1d 07 06 2E 2C 29 2D 2E 2E 37 3F 00 00 02 10
[    5.407008] fb_st7735r spi0.0: fbtft_request_one_gpio: 'reset-gpios' = GPIO27
[    5.409343] fb_st7735r spi0.0: fbtft_request_one_gpio: 'dc-gpios' = GPIO9
[    5.409391] fb_st7735r spi0.0: fbtft_verify_gpios()
[    5.409398] fb_st7735r spi0.0: fbtft_reset()
[    5.548817] fb_st7735r spi0.0: init: write(0x01) 
[    5.548864] fb_st7735r spi0.0: init: mdelay(150)
[    5.698899] fb_st7735r spi0.0: init: write(0x11) 
[    5.698985] fb_st7735r spi0.0: init: mdelay(500)
[    6.199019] fb_st7735r spi0.0: init: write(0xB1) 0x01 0x2C 0x2D 
[    6.199104] fb_st7735r spi0.0: init: write(0xB2) 0x01 0x2C 0x2D 
[    6.199137] fb_st7735r spi0.0: init: write(0xB3) 0x01 0x2C 0x2D 0x01 0x2C 0x2D 
[    6.199173] fb_st7735r spi0.0: init: write(0xB4) 0x07 
[    6.199201] fb_st7735r spi0.0: init: write(0xC0) 0xA2 0x02 0x84 
[    6.199230] fb_st7735r spi0.0: init: write(0xC1) 0xC5 
[    6.199254] fb_st7735r spi0.0: init: write(0xC2) 0x0A 0x00 
[    6.199281] fb_st7735r spi0.0: init: write(0xC3) 0x8A 0x2A 
[    6.199310] fb_st7735r spi0.0: init: write(0xC4) 0x8A 0xEE 
[    6.199343] fb_st7735r spi0.0: init: write(0xC5) 0x0E 
[    6.199368] fb_st7735r spi0.0: init: write(0x20) 
[    6.199384] fb_st7735r spi0.0: init: write(0x3A) 0x05 
[    6.199410] fb_st7735r spi0.0: init: write(0x29) 
[    6.199426] fb_st7735r spi0.0: init: mdelay(100)
[    6.299439] fb_st7735r spi0.0: init: write(0x13) 
[    6.299512] fb_st7735r spi0.0: init: mdelay(10)
[    6.394260] fb_st7735r spi0.0: Display update: 471 kB/s, fps=0
[    6.401748] graphics fb1: fb_st7735r frame buffer, 160x128, 40 KiB video memory, 4 KiB buffer memory, fps=25, spi0.0 at 4 MHz

[PhilE]

Fair enough - try this one:

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/*
 * Device Tree overlay for Adafruit 1.8" TFT LCD with ST7735R chip 160x128
 */

/dts-v1/;
/plugin/;

/ {
	compatible = "brcm,bcm2835";

	fragment@0 {
		target = <&spidev0>;
		__overlay__ {
			status = "disabled";
		};
	};

	fragment@1 {
		target = <&spi0>;
		__overlay__ {
			/* needed to avoid dtc warning */
			#address-cells = <1>;
			#size-cells = <0>;
			status = "okay";

			af18: adafruit18@0 {
				compatible = "fbtft,adafruit18";
				reg = <0>;
				pinctrl-names = "default";
				spi-max-frequency = <40000000>;
				rotate = <90>;
				buswidth = <8>;
				fps = <50>;
				height = <160>;
				width = <128>;
				reset-gpios = <&gpio 25 0>;
				dc-gpios = <&gpio 24 0>;
				led-gpios = <&gpio 18 0>;
				bgr;
				debug = <0>;
			};
		};
	};

	__overrides__ {
		green = <&af18>, "compatible=fbtft,adafruit18_green";
		speed     = <&af18>,"spi-max-frequency:0";
		rotate    = <&af18>,"rotate:0";
		fps       = <&af18>,"fps:0";
		bgr       = <&af18>,"bgr?";
		debug     = <&af18>,"debug:0";
		dc_pin    = <&af18>,"dc-gpios:4";
		reset_pin = <&af18>,"reset-gpios:4";
		led_pin   = <&af18>,"led-gpios:4";
	};
};

[PhilE]

And if that doesn't work, try this:

Code: Select all

/*
 * Device Tree overlay for Adafruit 1.8" TFT LCD with ST7735R chip 160x128
 */

/dts-v1/;
/plugin/;

/ {
	compatible = "brcm,bcm2835";

	fragment@0 {
		target = <&spidev0>;
		__overlay__ {
			status = "disabled";
		};
	};

	fragment@1 {
		target = <&spi0>;
		__overlay__ {
			/* needed to avoid dtc warning */
			#address-cells = <1>;
			#size-cells = <0>;
			status = "okay";

			af18: adafruit18@0 {
				compatible = "fbtft,adafruit18";
				reg = <0>;
				pinctrl-names = "default";
				spi-max-frequency = <40000000>;
				rotate = <90>;
				buswidth = <8>;
				fps = <50>;
				height = <160>;
				width = <128>;
				reset-gpios = <&gpio 25 1>;
				dc-gpios = <&gpio 24 0>;
				led-gpios = <&gpio 18 0>;
				bgr;
				debug = <0>;
			};
		};
	};

	__overrides__ {
		green = <&af18>, "compatible=fbtft,adafruit18_green";
		speed     = <&af18>,"spi-max-frequency:0";
		rotate    = <&af18>,"rotate:0";
		fps       = <&af18>,"fps:0";
		bgr       = <&af18>,"bgr?";
		debug     = <&af18>,"debug:0";
		dc_pin    = <&af18>,"dc-gpios:4";
		reset_pin = <&af18>,"reset-gpios:4";
		led_pin   = <&af18>,"led-gpios:4";
	};
};

This overlay marks the reset GPIO as being active-low, something that was necessary for at least one other display under 5.4.

[rudiratlos]

with the following .dts my display (waveshare1.8 / adafruit1.8 green) is working.
pixelartefacts are gone with rotation 0. with rotation 90 (.dts from phil) are still there.
bgr parameter is not working. red pixel appear blue and blue pixel appear red.

my /boot/config.txt

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dtoverlay=adafruit18,green,dc_pin=9,reset_pin=27,debug=3

my /boot/cmdline.txt

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console=serial0,115200 console=tty1 .... rootwait fbcon=map:10 fbcon=rotate:1

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/*
 * Device Tree overlay for Adafruit/Waveshare 1.8" TFT LCD with ST7735 chip 160x128
 *
 * compile:
 * dtc -@ -I dts -Odtc -@ -I dts -O dtb -o /boot/overlays/adafruit18.dtbo adafruit18.dts
 */

/dts-v1/;
/plugin/;

/ {
	compatible = "brcm,bcm2835";

	fragment@0 {
		target = <&spidev0>;
		__overlay__ {
			status = "disabled";
		};
	};

	fragment@1 {
		target = <&spi0>;
		__overlay__ {
			/* needed to avoid dtc warning */
			#address-cells = <1>;
			#size-cells = <0>;
			status = "okay";

			st7735: st7735@0 {
				compatible = "fbtft,adafruit18";
				reg = <0>;
				pinctrl-names = "default";
				spi-max-frequency = <40000000>;
				rotate = <0>;
				buswidth = <8>;
				fps = <25>;
				height = <160>;
				width = <128>;
				reset-gpios = <&gpio 25 1>;
				dc-gpios = <&gpio 24 0>;
				led-gpios = <&gpio 18 0>;
				bgr = <0>;
				debug = <0>;
			};
		};
	};

	__overrides__ {
		green     = <&st7735>,"compatible=fbtft,adafruit18_green";
		height    = <&st7735>,"height:0";
		width     = <&st7735>,"width:0";
		speed     = <&st7735>,"spi-max-frequency:0";
		rotate    = <&st7735>,"rotate:0";
		fps       = <&st7735>,"fps:0";
		bgr       = <&st7735>,"bgr:0";
		debug     = <&st7735>,"debug:0";
		dc_pin    = <&st7735>,"dc-gpios:4";
		reset_pin = <&st7735>,"reset-gpios:4";
		led_pin   = <&st7735>,"led-gpios:4";
	};
};

[PhilE]

The bgr parameter is a Device Tree boolean - true if the property is present, false if it's absent. This should work better:

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/*
 * Device Tree overlay for Adafruit/Waveshare 1.8" TFT LCD with ST7735 chip 160x128
 *
 * compile:
 * dtc -@ -I dts -Odtc -@ -I dts -O dtb -o /boot/overlays/adafruit18.dtbo adafruit18.dts
 */

/dts-v1/;
/plugin/;

/ {
	compatible = "brcm,bcm2835";

	fragment@0 {
		target = <&spidev0>;
		__overlay__ {
			status = "disabled";
		};
	};

	fragment@1 {
		target = <&spi0>;
		__overlay__ {
			/* needed to avoid dtc warning */
			#address-cells = <1>;
			#size-cells = <0>;
			status = "okay";

			st7735: st7735@0 {
				compatible = "fbtft,adafruit18";
				reg = <0>;
				pinctrl-names = "default";
				spi-max-frequency = <40000000>;
				rotate = <0>;
				buswidth = <8>;
				fps = <25>;
				height = <160>;
				width = <128>;
				reset-gpios = <&gpio 25 1>;
				dc-gpios = <&gpio 24 0>;
				led-gpios = <&gpio 18 0>;
				debug = <0>;
			};
		};
	};

	__overrides__ {
		green     = <&st7735>,"compatible=fbtft,adafruit18_green";
		height    = <&st7735>,"height:0";
		width     = <&st7735>,"width:0";
		speed     = <&st7735>,"spi-max-frequency:0";
		rotate    = <&st7735>,"rotate:0";
		fps       = <&st7735>,"fps:0";
		bgr       = <&st7735>,"bgr?";
		debug     = <&st7735>,"debug:0";
		dc_pin    = <&st7735>,"dc-gpios:4";
		reset_pin = <&st7735>,"reset-gpios:4";
		led_pin   = <&st7735>,"led-gpios:4";
	};
};

I don't know what to do about the pixel artifacts when the display is rotated.

[rudiratlos]

still not working:

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dtoverlay=adafruit18,green,bgr,dc_pin=9,reset_pin=27,debug=3

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[    4.231045] fb_st7735r: module is from the staging directory, the quality is unknown, you have been warned.
[    4.231436] fbtft_of_value: width = 128
[    4.231443] fbtft_of_value: height = 160
[    4.231450] fbtft_of_value: buswidth = 8
[    4.231458] fbtft_of_value: debug = 3
[    4.231464] fbtft_of_value: rotate = 0
[    4.231471] fbtft_of_value: fps = 25

[rudiratlos]

pixerartefacts are gone, if we use rotate=0 in .dts
and if we do the rotation on application level e.g. gfx library and in cmdline.txt for fbcon.

[notro]

Rotation is panel specific and implemented for a particular panel. The set_var() function uses command 0x36 to set the rotation. The solution for panels for which rotation doesn't work is to uses the init= property to override 0x36, but unfortunately this doesn't work with drivers that has set_var() since it is applied after init().

But rotation didn't work when you used fbtft_device, right?

fbtft is full of strange things since I didn't know anything about these displays and their controllers when I wrote the first drivers (neither did I know anything about the Linux kernel).

[PhilE]

still not working:

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dtoverlay=adafruit18,green,bgr,dc_pin=9,reset_pin=27,debug=3

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[    4.231045] fb_st7735r: module is from the staging directory, the quality is unknown, you have been warned.
[    4.231436] fbtft_of_value: width = 128
[    4.231443] fbtft_of_value: height = 160
[    4.231450] fbtft_of_value: buswidth = 8
[    4.231458] fbtft_of_value: debug = 3
[    4.231464] fbtft_of_value: rotate = 0
[    4.231471] fbtft_of_value: fps = 25

There is no debug output for the bgr property - it is handled by a different function. Are you saying that using the bgr parameter makes no difference?

[rudiratlos]

using bgr in config.txt makes no difference. red pixels apear blue and blue pixels apear red.
As notro wrote there is a MADCTL (36h) register that flips RGB to BGR color order.

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‘1’ =BGR, (When MADCTL (36h) D3=’1’)
‘0’ =RGB, (When MADCTL (36h) D3=’0’)

I have no idea, how to pass bgr parameter from config.txt to the driver

[PhilE]

Be careful - there are now multiple versions of the overlay around with different default values.

The last version I posted has BGR mode disabled by default - use "dtoverlay=adafruit,green,bgr" or "dtoverlay=adafruit,green,bgr=on" to enable it.
Other versions have BGR mode enabled by default - use "dtoverlay=adafruit,green,bgr=off" to disable it.
It's clearer and safer to always include either "bgr=on" or "bgr=off". I've seen the driver set the appropriate bit to either a 1 or zero according to the parameter value, so it should work with the real display.

[rudiratlos]

bgr=off does the trick.

how can I set this parameter to off in .dts file ?

[PhilE]

Delete any line like these:

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		bgr = <0>;
		bgr;

[rudiratlos]

but if I want to set bgr=on (for other display)?

[PhilE]

Use the parameter.

There are two different things called "bgr" (three if you include the bit in the hardware register) - the property that controls the bit, and the parameter that sets (creates) or clears (deletes) the property. If your overlay includes the property then the BGR bit defaults to on; if your overlay doesn't include the property then the BGR bit defaults to off. As long as you include the parameter declaration (bgr = <&st7735>,"bgr?") then you can always override the default in either direction.

[rudiratlos]

i have some products in the field, where config.txt doesn't contain bgr=off. and I have my own dtoverlay (not adafruit18), created with my .dts file.
on next update, I just want to copy my new overlay to /boot/overlays. I don't want to write a script that maintains config.txt
in my .dts I just want to set bgr to off as default.

[rudiratlos]

solved, I've just dropt bgr;
philE, Thank you very much for your support.

[micwag]

Hello,
I had recently the same problem with the sainsmart18 display and last linux kernel. My solution was to go back to 4.19.118+.
I see now you found a solution, great.
But I can not follow all the steps...
Can you give a short advice which of the steps are really necessary to get it running?

Thanks
Micha

[rudiratlos]

Hi Micha,
this is my solution:

/boot/cmdline.txt

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console=serial0,115200 console=tty1 ... rootwait fbcon=map:10 fbcon=rotate:1

/boot/config.txt

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dtoverlay=fluidicworks18,green,dc_pin=9,reset_pin=27,debug=3

I've created my own device (fluidicworks18)
fluidicworks18.dts

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/*
 * Device Tree overlay for Adafruit/Waveshare 1.8" TFT LCD with ST7735 chip 160x128
 *
 * compile:
 * dtc -@ -I dts -Odtc -@ -I dts -O dtb -o /boot/overlays/adafruit18.dtbo adafruit18.dts
 */

/dts-v1/;
/plugin/;

/ {
	compatible = "brcm,bcm2835";

	fragment@0 {
		target = <&spidev0>;
		__overlay__ {
			status = "disabled";
		};
	};

	fragment@1 {
		target = <&spi0>;
		__overlay__ {
			/* needed to avoid dtc warning */
			#address-cells = <1>;
			#size-cells = <0>;
			status = "okay";

			st7735: st7735@0 {
				compatible = "fbtft,adafruit18";
				reg = <0>;
				pinctrl-names = "default";
				spi-max-frequency = <40000000>;
				rotate = <0>;
				buswidth = <8>;
				fps = <25>;
				height = <160>;
				width = <128>;
				reset-gpios = <&gpio 25 1>;
				dc-gpios = <&gpio 24 0>;
				led-gpios = <&gpio 18 0>;
				debug = <0>;
			};
		};
	};

	__overrides__ {
		green     = <&st7735>,"compatible=fbtft,adafruit18_green";
		height    = <&st7735>,"height:0";
		width     = <&st7735>,"width:0";
		speed     = <&st7735>,"spi-max-frequency:0";
		rotate    = <&st7735>,"rotate:0";
		fps       = <&st7735>,"fps:0";
		bgr       = <&st7735>,"bgr?";
		debug     = <&st7735>,"debug:0";
		dc_pin    = <&st7735>,"dc-gpios:4";
		reset_pin = <&st7735>,"reset-gpios:4";
		led_pin   = <&st7735>,"led-gpios:4";
	};
};

COMPILE it:

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dtc -@ -I dts -O dtb -o /boot/overlays/fluidicworks18.dtbo fluidicworks18.dts

my OS version:

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uname -a
Linux pump 5.4.72-v7l+ #1356 SMP Thu Oct 22 13:57:51 BST 2020 armv7l GNU/Linux

[PhilE]

Note that you will need to use sudo dtc if you want to write the compiled overlay direct to the overlays directory.

[micwag]

Hallo Rudi,
thanks for your response. I did not saw for long time, hence I was not online here. Will check soon, if it is working.

Thanks for support,
Michael