From 365b69204bfbfdf4060f8f88d9c54d65c82efc61 Mon Sep 17 00:00:00 2001 From: Phil Elwell Date: Mon, 21 Jan 2019 21:17:27 +0000 Subject: [PATCH 311/725] overlays: Add ssd1306 overlay for OLED display See: https://github.com/raspberrypi/firmware/issues/1098 Signed-off-by: mincepi --- arch/arm/boot/dts/overlays/Makefile | 1 + arch/arm/boot/dts/overlays/README | 31 ++++++++++++++++ .../arm/boot/dts/overlays/ssd1306-overlay.dts | 36 +++++++++++++++++++ 3 files changed, 68 insertions(+) create mode 100644 arch/arm/boot/dts/overlays/ssd1306-overlay.dts --- a/arch/arm/boot/dts/overlays/Makefile +++ b/arch/arm/boot/dts/overlays/Makefile @@ -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 \ --- a/arch/arm/boot/dts/overlays/README +++ b/arch/arm/boot/dts/overlays/README @@ -1950,6 +1950,37 @@ Params: cs0_pin GPIO pin is 'okay' or enabled). +Name: ssd1306 +Info: Overlay for activation of SSD1306 over I2C OLED display framebuffer. +Load: dtoverlay=ssd1306,= +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,= --- /dev/null +++ b/arch/arm/boot/dts/overlays/ssd1306-overlay.dts @@ -0,0 +1,36 @@ +// 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?"; + }; +};