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