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105 lines
3.5 KiB
Diff
105 lines
3.5 KiB
Diff
From d8eac0d3e4f6c6f9e5f789c8e2288699b2afebcb Mon Sep 17 00:00:00 2001
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From: Phil Elwell <phil@raspberrypi.org>
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Date: Mon, 21 Jan 2019 21:17:27 +0000
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Subject: [PATCH] overlays: Add ssd1306 overlay for OLED display
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See: https://github.com/raspberrypi/firmware/issues/1098
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Signed-off-by: mincepi <mincepi@gmail.com>
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---
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arch/arm/boot/dts/overlays/Makefile | 1 +
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arch/arm/boot/dts/overlays/README | 31 ++++++++++++++++
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.../arm/boot/dts/overlays/ssd1306-overlay.dts | 36 +++++++++++++++++++
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3 files changed, 68 insertions(+)
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create mode 100644 arch/arm/boot/dts/overlays/ssd1306-overlay.dts
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--- a/arch/arm/boot/dts/overlays/Makefile
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+++ b/arch/arm/boot/dts/overlays/Makefile
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@@ -135,6 +135,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
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spi2-1cs.dtbo \
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spi2-2cs.dtbo \
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spi2-3cs.dtbo \
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+ ssd1306.dtbo \
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superaudioboard.dtbo \
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sx150x.dtbo \
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tc358743.dtbo \
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--- a/arch/arm/boot/dts/overlays/README
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+++ b/arch/arm/boot/dts/overlays/README
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@@ -1950,6 +1950,37 @@ Params: cs0_pin GPIO pin
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is 'okay' or enabled).
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+Name: ssd1306
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+Info: Overlay for activation of SSD1306 over I2C OLED display framebuffer.
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+Load: dtoverlay=ssd1306,<param>=<val>
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+Params: address Location in display memory of first character.
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+ (default=0)
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+ width Width of display. (default=128)
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+ height Height of display. (default=64)
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+ offset virtual channel a. (default=0)
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+ normal Has no effect on displays tested. (default=not
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+ set)
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+ sequential Set this if every other scan line is missing.
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+ (default=not set)
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+ remapped Set this if display is garbled. (default=not
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+ set)
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+ inverted Set this if display is inverted and mirrored.
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+ (default=not set)
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+
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+ Examples:
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+ Typical usage for 128x64 display: dtoverlay=ssd1306,inverted
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+
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+ Typical usage for 128x32 display: dtoverlay=ssd1306,inverted,sequential
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+
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+ i2c_baudrate=400000 will speed up the display.
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+
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+ i2c_baudrate=1000000 seems to work even though it's not officially
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+ supported by the hardware, and is faster still.
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+
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+ For more information refer to the device datasheet at:
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+ https://cdn-shop.adafruit.com/datasheets/SSD1306.pdf
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+
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+
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Name: superaudioboard
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Info: Configures the SuperAudioBoard sound card
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Load: dtoverlay=superaudioboard,<param>=<val>
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--- /dev/null
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+++ b/arch/arm/boot/dts/overlays/ssd1306-overlay.dts
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@@ -0,0 +1,36 @@
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+// Overlay for SSD1306 128x64 and 128x32 OLED displays
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+/dts-v1/;
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+/plugin/;
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+
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+/ {
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+ compatible = "brcm,bcm2718";
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+
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+ fragment@0 {
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+ target = <&i2c1>;
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+ __overlay__ {
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+ status = "okay";
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+
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+ #address-cells = <1>;
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+ #size-cells = <0>;
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+
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+ ssd1306: oled@3c{
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+ compatible = "solomon,ssd1306fb-i2c";
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+ reg = <0x3c>;
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+ solomon,width = <128>;
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+ solomon,height = <64>;
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+ solomon,page-offset = <0>;
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+ };
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+ };
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+ };
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+
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+ __overrides__ {
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+ address = <&ssd1306>,"reg:0";
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+ width = <&ssd1306>,"solomon,width:0";
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+ height = <&ssd1306>,"solomon,height:0";
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+ offset = <&ssd1306>,"solomon,page-offset:0";
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+ normal = <&ssd1306>,"solomon,segment-no-remap?";
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+ sequential = <&ssd1306>,"solomon,com-seq?";
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+ remapped = <&ssd1306>,"solomon,com-lrremap?";
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+ inverted = <&ssd1306>,"solomon,com-invdir?";
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+ };
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+};
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