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From 67cd4f249333f3de9b449b9e6ebadd08facc6957 Mon Sep 17 00:00:00 2001
From: Dave Stevenson <dave.stevenson@raspberrypi.com>
Date: Mon, 4 Oct 2021 14:15:38 +0100
Subject: [PATCH] dtoverlays: Add overlay for ST7735R (160x128) TinyDRM
driver
Adds an overlay to configure the TinyDRM driver for ST7735R
based 160x128 and 128x128 (untested) displays such as the
Adafruit 1.8" display.
Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
---
arch/arm/boot/dts/overlays/Makefile | 1 +
arch/arm/boot/dts/overlays/README | 14 ++++
.../dts/overlays/adafruit-st7735r-overlay.dts | 83 +++++++++++++++++++
3 files changed, 98 insertions(+)
create mode 100644 arch/arm/boot/dts/overlays/adafruit-st7735r-overlay.dts
--- a/arch/arm/boot/dts/overlays/Makefile
+++ b/arch/arm/boot/dts/overlays/Makefile
@@ -4,6 +4,7 @@ dtb-$(CONFIG_ARCH_BCM2835) += overlay_ma
dtbo-$(CONFIG_ARCH_BCM2835) += \
act-led.dtbo \
+ adafruit-st7735r.dtbo \
adafruit18.dtbo \
adau1977-adc.dtbo \
adau7002-simple.dtbo \
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -299,9 +299,23 @@ Params: activelow Set to "
REQUIRED
+Name: adafruit-st7735r
+Info: Overlay for the SPI-connected Adafruit 1.8" 160x128 or 128x128 displays,
+ based on the ST7735R chip.
+ This overlay uses the newer DRM/KMS "Tiny" driver.
+Load: dtoverlay=adafruit-st7735r,<param>=<val>
+Params: 128x128 Select the 128x128 driver (default 160x128)
+ rotate Display rotation {0,90,180,270} (default 90)
+ speed SPI bus speed in Hz (default 4000000)
+ dc_pin GPIO pin for D/C (default 24)
+ reset_pin GPIO pin for RESET (default 25)
+ led_pin GPIO used to control backlight (default 18)
+
+
Name: adafruit18
Info: Overlay for the SPI-connected Adafruit 1.8" display (based on the
ST7735R chip). It includes support for the "green tab" version.
+ This overlay uses the older fbtft driver.
Load: dtoverlay=adafruit18,<param>=<val>
Params: green Use the adafruit18_green variant.
rotate Display rotation {0,90,180,270}
--- /dev/null
+++ b/arch/arm/boot/dts/overlays/adafruit-st7735r-overlay.dts
@@ -0,0 +1,83 @@
+/*
+ * adafruit-st7735r-overlay.dts
+ *
+ * ST7735R based SPI LCD displays. Either
+ * Adafruit 1.8" 160x128
+ * or
+ * Okaya 1.44" 128x128
+ */
+
+/dts-v1/;
+/plugin/;
+
+#include <dt-bindings/gpio/gpio.h>
+
+/ {
+ compatible = "brcm,bcm2835";
+
+ fragment@0 {
+ target = <&spidev0>;
+ __overlay__ {
+ status = "disabled";
+ };
+ };
+
+ fragment@1 {
+ target = <&gpio>;
+ __overlay__ {
+ adafruit_pins: adafruit_pins {
+ brcm,pins = <25 24>;
+ brcm,function = <1>; /* out */
+ };
+ backlight_pins: backlight_pins {
+ brcm,pins = <18>;
+ brcm,function = <1>; /* out */
+ };
+ };
+ };
+
+ fragment@2 {
+ target-path = "/";
+ __overlay__ {
+ af18_backlight: backlight {
+ compatible = "gpio-backlight";
+ gpios = <&gpio 18 GPIO_ACTIVE_HIGH>;
+ pinctrl-names = "default";
+ pinctrl-0 = <&backlight_pins>;
+ };
+ };
+ };
+
+ fragment@3 {
+ target = <&spi0>;
+ __overlay__ {
+ /* needed to avoid dtc warning */
+ #address-cells = <1>;
+ #size-cells = <0>;
+ status = "okay";
+
+ af18: adafruit18@0 {
+ compatible = "jianda,jd-t18003-t01";
+ reg = <0>;
+ spi-max-frequency = <32000000>;
+ dc-gpios = <&gpio 24 GPIO_ACTIVE_HIGH>;
+ reset-gpios = <&gpio 25 GPIO_ACTIVE_HIGH>;
+ rotate = <90>;
+ pinctrl-names = "default";
+ pinctrl-0 = <&adafruit_pins>;
+ backlight = <&af18_backlight>;
+ };
+ };
+ };
+
+ __overrides__ {
+ 128x128 = <&af18>, "compatible=okaya,rh128128t";
+ speed = <&af18>,"spi-max-frequency:0";
+ rotate = <&af18>,"rotate:0";
+ dc_pin = <&af18>,"dc-gpios:4", <&adafruit_pins>,"brcm,pins:4";
+ reset_pin = <&af18>,"reset-gpios:4",
+ <&adafruit_pins>,"brcm,pins:0";
+ led_pin = <&af18_backlight>,"gpios:4",
+ <&backlight_pins>,"brcm,pins:0";
+ };
+};
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