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From db048a80e63c66607b3bd73fa641802ec83bf166 Mon Sep 17 00:00:00 2001
From: MikeDK <m.kaplan@evva.com>
Date: Fri, 31 Jan 2020 10:57:21 +0100
Subject: [PATCH] overlays: Add ssd1306-spi overlay (#3440)
Add an overlay for SSD1306 based OLED boards using SPI.
This will load the staging fbtft driver.
Signed-off-by: Michael Kaplan <m.kaplan@evva.com>
---
arch/arm/boot/dts/overlays/Makefile | 1 +
arch/arm/boot/dts/overlays/README | 12 +++
.../boot/dts/overlays/ssd1306-spi-overlay.dts | 82 +++++++++++++++++++
3 files changed, 95 insertions(+)
create mode 100644 arch/arm/boot/dts/overlays/ssd1306-spi-overlay.dts
--- a/arch/arm/boot/dts/overlays/Makefile
+++ b/arch/arm/boot/dts/overlays/Makefile
@@ -168,6 +168,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
spi6-1cs.dtbo \
spi6-2cs.dtbo \
ssd1306.dtbo \
+ ssd1306-spi.dtbo \
superaudioboard.dtbo \
sx150x.dtbo \
tc358743.dtbo \
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -2428,6 +2428,18 @@ Params: address Location
https://cdn-shop.adafruit.com/datasheets/SSD1306.pdf
+Name: ssd1306-spi
+Info: Overlay for SSD1306 OLED via SPI using fbtft staging driver.
+Load: dtoverlay=ssd1306-spi,<param>=<val>
+Params: speed SPI bus speed (default 10000000)
+ rotate Display rotation (0, 90, 180 or 270; default 0)
+ fps Delay between frame updates (default 25)
+ debug Debug output level (0-7; default 0)
+ dc_pin GPIO pin for D/C (default 24)
+ reset_pin GPIO pin for RESET (default 25)
+ height Display height (32 or 64; default 64)
+
+
Name: superaudioboard
Info: Configures the SuperAudioBoard sound card
Load: dtoverlay=superaudioboard,<param>=<val>
--- /dev/null
+++ b/arch/arm/boot/dts/overlays/ssd1306-spi-overlay.dts
@@ -0,0 +1,82 @@
+/*
+ * Device Tree overlay for SSD1306 based SPI OLED display
+ *
+ */
+
+/dts-v1/;
+/plugin/;
+
+/ {
+ compatible = "brcm,bcm2835";
+
+ fragment@0 {
+ target = <&spi0>;
+ __overlay__ {
+ status = "okay";
+ };
+ };
+
+ fragment@1 {
+ target = <&spidev0>;
+ __overlay__ {
+ status = "disabled";
+ };
+ };
+
+ fragment@2 {
+ target = <&spidev1>;
+ __overlay__ {
+ status = "disabled";
+ };
+ };
+
+ fragment@3 {
+ target = <&gpio>;
+ __overlay__ {
+ ssd1306_pins: ssd1306_pins {
+ brcm,pins = <25 24>;
+ brcm,function = <1 1>; /* out out */
+ };
+ };
+ };
+
+ fragment@4 {
+ target = <&spi0>;
+ __overlay__ {
+ /* needed to avoid dtc warning */
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ ssd1306: ssd1306@0{
+ compatible = "solomon,ssd1306";
+ reg = <0>;
+ pinctrl-names = "default";
+ pinctrl-0 = <&ssd1306_pins>;
+
+ spi-max-frequency = <10000000>;
+ bgr = <0>;
+ bpp = <1>;
+ rotate = <0>;
+ fps = <25>;
+ buswidth = <8>;
+ reset-gpios = <&gpio 25 0>;
+ dc-gpios = <&gpio 24 0>;
+ debug = <0>;
+
+ solomon,height = <64>;
+ solomon,width = <128>;
+ solomon,page-offset = <0>;
+ };
+ };
+ };
+
+ __overrides__ {
+ speed = <&ssd1306>,"spi-max-frequency:0";
+ rotate = <&ssd1306>,"rotate:0";
+ fps = <&ssd1306>,"fps:0";
+ debug = <&ssd1306>,"debug:0";
+ dc_pin = <&ssd1306>,"dc-gpios:4>";
+ reset_pin = <&ssd1306>,"reset-gpios:4>";
+ height = <&ssd1306>,"solomon,height:0>";
+ };
+};
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