Commit 01269567 authored by Phil Elwell's avatar Phil Elwell
Browse files

overlays: Add ssd1306 overlay for OLED display 

See: https://github.com/raspberrypi/firmware/issues/1098



Signed-off-by: default avatarmincepi <mincepi@gmail.com>
parent 66b333b3

arch/arm/boot/dts/overlays/Makefile

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@@ -135,6 +135,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \ 
	spi2-1cs.dtbo \

	spi2-2cs.dtbo \

	spi2-3cs.dtbo \

	ssd1306.dtbo \

	superaudioboard.dtbo \

	sx150x.dtbo \

	tc358743.dtbo \

arch/arm/boot/dts/overlays/README

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@@ -1929,6 +1929,37 @@ Params: cs0_pin GPIO pin for CS0 (default 43 - BCM SPI2_CE0). 
                                is 'okay' or enabled).





Name:   ssd1306

Info:   Overlay for activation of SSD1306 over I2C OLED display framebuffer.

Load:   dtoverlay=ssd1306,<param>=<val>

Params: address                 Location in display memory of first character.

                                (default=0)

        width                   Width of display. (default=128)

        height                  Height of display. (default=64)

        offset                  virtual channel a. (default=0)

        normal                  Has no effect on displays tested. (default=not

                                set)

        sequential              Set this if every other scan line is missing.

                                (default=not set)

        remapped                Set this if display is garbled. (default=not

                                set)

        inverted                Set this if display is inverted and mirrored.

                                (default=not set)



        Examples:

        Typical usage for 128x64 display: dtoverlay=ssd1306,inverted



        Typical usage for 128x32 display: dtoverlay=ssd1306,inverted,sequential



        i2c_baudrate=400000 will speed up the display.



        i2c_baudrate=1000000 seems to work even though it's not officially

        supported by the hardware, and is faster still.



        For more information refer to the device datasheet at:

        https://cdn-shop.adafruit.com/datasheets/SSD1306.pdf





Name:   superaudioboard

Info:   Configures the SuperAudioBoard sound card

Load:   dtoverlay=superaudioboard,<param>=<val>

arch/arm/boot/dts/overlays/ssd1306-overlay.dts

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// Overlay for SSD1306 128x64 and 128x32 OLED displays

/dts-v1/;

/plugin/;



/ {

    compatible = "brcm,bcm2718";



    fragment@0 {

	target = <&i2c1>;

	__overlay__ {

	    status = "okay";



	    #address-cells = <1>;

	    #size-cells = <0>;



	    ssd1306: oled@3c{

		compatible = "solomon,ssd1306fb-i2c";

		reg = <0x3c>;

		solomon,width = <128>;

		solomon,height = <64>;

		solomon,page-offset = <0>;

	    };

	};

    };



    __overrides__ {

	address = <&ssd1306>,"reg:0";

	width = <&ssd1306>,"solomon,width:0";

	height = <&ssd1306>,"solomon,height:0";

	offset = <&ssd1306>,"solomon,page-offset:0";

	normal = <&ssd1306>,"solomon,segment-no-remap?";

	sequential = <&ssd1306>,"solomon,com-seq?";

	remapped = <&ssd1306>,"solomon,com-lrremap?";

	inverted = <&ssd1306>,"solomon,com-invdir?";

    };

};