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From d8eac0d3e4f6c6f9e5f789c8e2288699b2afebcb Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.org>
Date: Mon, 21 Jan 2019 21:17:27 +0000
Subject: [PATCH] overlays: Add ssd1306 overlay for OLED display
See: https://github.com/raspberrypi/firmware/issues/1098
Signed-off-by: mincepi <mincepi@gmail.com>
---
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,<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>
--- /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?";
+ };
+};
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