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From bf5020c3cbf3e799379c661e2f653ac572175d67 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Noralf=20Tr=C3=B8nnes?= <noralf@tronnes.org>
Date: Mon, 7 Mar 2022 17:05:49 +0100
Subject: [PATCH] overlays: Add overlay for MIPI DBI displays
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Add an overlay that can be used with all displays that have a
MIPI DBI compatible controller (pixels over SPI).
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
---
arch/arm/boot/dts/overlays/Makefile | 1 +
arch/arm/boot/dts/overlays/README | 67 +++++++
.../dts/overlays/mipi-dbi-spi-overlay.dts | 172 ++++++++++++++++++
3 files changed, 240 insertions(+)
create mode 100644 arch/arm/boot/dts/overlays/mipi-dbi-spi-overlay.dts
--- a/arch/arm/boot/dts/overlays/Makefile
+++ b/arch/arm/boot/dts/overlays/Makefile
@@ -135,6 +135,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
midi-uart5.dtbo \
minipitft13.dtbo \
miniuart-bt.dtbo \
+ mipi-dbi-spi.dtbo \
mlx90640.dtbo \
mmc.dtbo \
mpu6050.dtbo \
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -2386,6 +2386,73 @@ Params: krnbt Set to "
driver without need of hciattach/btattach
+Name: mipi-dbi-spi
+Info: Overlay for SPI-connected MIPI DBI displays using the panel-mipi-dbi
+ driver. The driver will load a file /lib/firmware/panel.bin containing
+ the initialisation commands.
+
+ Example:
+ dtoverlay=mipi-dbi-spi,spi0-0,speed=70000000
+ dtparam=width=320,height=240
+ dtparam=reset-gpio=23,dc-gpio=24
+ dtparam=backlight-gpio=18
+
+ Compared to fbtft panel-mipi-dbi runs pixel data at spi-max-frequency
+ and init commands at 10MHz. This makes it possible to push the envelope
+ without messing up the controller configuration due to command
+ transmission errors.
+
+ For devices on spi1 or spi2, the interfaces should be enabled
+ with one of the spi1-1/2/3cs and/or spi2-1/2/3cs overlays.
+
+ See https://github.com/notro/panel-mipi-dbi/wiki for more info.
+
+Load: dtoverlay=mipi-dbi-spi,<param>=<val>
+Params:
+ compatible Set the compatible string to load a different
+ firmware file. Both the panel compatible value
+ used to load the firmware file and the value
+ used to load the driver has to be set having a
+ NUL (\0) separator between them.
+ Example:
+ dtparam=compatible=mypanel\0panel-mipi-dbi-spi
+ spi<n>-<m> Configure device at spi<n>, cs<m>
+ (boolean, required)
+ speed SPI bus speed in Hz (default 32000000)
+ cpha Shifted SPI clock phase (CPHA) mode
+ cpol Inverse SPI clock polarity (CPOL) mode
+ write-only Controller is not readable
+ (ie. MISO is not wired up).
+
+ width Panel width in pixels (required)
+ height Panel height in pixels (required)
+ width-mm Panel width in mm
+ height-mm Panel height in mm
+ x-offset Panel x-offset in controller RAM
+ y-offset Panel y-offset in controller RAM
+
+ clock-frequency Panel clock frequency in Hz
+ (optional, just informational).
+
+ reset-gpio GPIO pin to be used for RESET
+ dc-gpio GPIO pin to be used for D/C
+
+ backlight-gpio GPIO pin to be used for backlight control
+ (default of none).
+ backlight-pwm PWM channel to be used for backlight control
+ (default of none). NB Disables audio headphone
+ output as that also uses PWM.
+ backlight-pwm-chan Choose channel on &pwm node for backlight
+ control (default 0).
+ backlight-pwm-gpio GPIO pin to be used for the PWM backlight. See
+ pwm-2chan for valid options (default 18).
+ backlight-pwm-func Pin function of GPIO used for the PWM backlight.
+ See pwm-2chan for valid options (default 2).
+ backlight-def-brightness
+ Set the default brightness. Normal range 1-16.
+ (default 16).
+
+
Name: mlx90640
Info: Overlay for i2c connected mlx90640 thermal camera
Load: dtoverlay=mlx90640
--- /dev/null
+++ b/arch/arm/boot/dts/overlays/mipi-dbi-spi-overlay.dts
@@ -0,0 +1,172 @@
+/*
+ * mipi-dbi-spi-overlay.dts
+ */
+
+#include <dt-bindings/gpio/gpio.h>
+
+/dts-v1/;
+/plugin/;
+
+/ {
+ compatible = "brcm,bcm2835";
+
+ spidev_fragment: fragment@0 {
+ target-path = "spi0/spidev@0";
+ __overlay__ {
+ status = "disabled";
+ };
+ };
+
+ panel_fragment: fragment@1 {
+ target = <&spi0>;
+ __overlay__ {
+ /* needed to avoid dtc warning */
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ status = "okay";
+
+ panel: panel@0 {
+ compatible = "panel", "panel-mipi-dbi-spi";
+ reg = <0>;
+ spi-max-frequency = <32000000>;
+
+ timing: panel-timing {
+ hactive = <320>;
+ vactive = <240>;
+ hback-porch = <0>;
+ vback-porch = <0>;
+
+ clock-frequency = <0>;
+ hfront-porch = <0>;
+ hsync-len = <0>;
+ vfront-porch = <0>;
+ vsync-len = <0>;
+ };
+ };
+ };
+ };
+
+ fragment@10 {
+ target = <&panel>;
+ __dormant__ {
+ backlight = <&backlight_gpio>;
+ };
+ };
+
+ fragment@11 {
+ target-path = "/";
+ __dormant__ {
+ backlight_gpio: backlight_gpio {
+ compatible = "gpio-backlight";
+ gpios = <&gpio 255 GPIO_ACTIVE_HIGH>;
+ };
+ };
+ };
+
+ fragment@20 {
+ target = <&panel>;
+ __dormant__ {
+ backlight = <&backlight_pwm>;
+ };
+ };
+
+ fragment@21 {
+ target-path = "/";
+ __dormant__ {
+ backlight_pwm: backlight_pwm {
+ compatible = "pwm-backlight";
+ brightness-levels = <0 6 8 12 16 24 32 40 48 64 96 128 160 192 224 255>;
+ default-brightness-level = <16>;
+ pwms = <&pwm 0 200000>;
+ };
+ };
+ };
+
+ fragment@22 {
+ target = <&pwm>;
+ __dormant__ {
+ pinctrl-names = "default";
+ pinctrl-0 = <&pwm_pins>;
+ assigned-clock-rates = <1000000>;
+ status = "okay";
+ };
+ };
+
+ fragment@23 {
+ target = <&gpio>;
+ __dormant__ {
+ pwm_pins: pwm_pins {
+ brcm,pins = <18>;
+ brcm,function = <2>; /* Alt5 */
+ };
+ };
+ };
+
+ fragment@24 {
+ target = <&audio>;
+ __dormant__ {
+ brcm,disable-headphones;
+ };
+ };
+
+ __overrides__ {
+ compatible = <&panel>, "compatible";
+
+ spi0-0 = <&panel_fragment>, "target:0=",<&spi0>,
+ <&spidev_fragment>, "target-path=spi0/spidev@0",
+ <&panel>, "reg:0=0";
+ spi0-1 = <&panel_fragment>, "target:0=",<&spi0>,
+ <&spidev_fragment>, "target-path=spi0/spidev@1",
+ <&panel>, "reg:0=1";
+ spi1-0 = <&panel_fragment>, "target:0=",<&spi1>,
+ <&spidev_fragment>, "target-path=spi1/spidev@0",
+ <&panel>, "reg:0=0";
+ spi1-1 = <&panel_fragment>, "target:0=",<&spi1>,
+ <&spidev_fragment>, "target-path=spi1/spidev@1",
+ <&panel>, "reg:0=1";
+ spi1-2 = <&panel_fragment>, "target:0=",<&spi1>,
+ <&spidev_fragment>, "target-path=spi1/spidev@2",
+ <&panel>, "reg:0=2";
+ spi2-0 = <&panel_fragment>, "target:0=",<&spi2>,
+ <&spidev_fragment>, "target-path=spi2/spidev@0",
+ <&panel>, "reg:0=0";
+ spi2-1 = <&panel_fragment>, "target:0=",<&spi2>,
+ <&spidev_fragment>, "target-path=spi2/spidev@1",
+ <&panel>, "reg:0=1";
+ spi2-2 = <&panel_fragment>, "target:0=",<&spi2>,
+ <&spidev_fragment>, "target-path=spi2/spidev@2",
+ <&panel>, "reg:0=2";
+
+ speed = <&panel>, "spi-max-frequency:0";
+ cpha = <&panel>, "spi-cpha?";
+ cpol = <&panel>, "spi-cpol?";
+
+ write-only = <&panel>, "write-only?";
+
+ width = <&timing>, "hactive:0";
+ height = <&timing>, "vactive:0";
+ x-offset = <&timing>, "hback-porch:0";
+ y-offset = <&timing>, "vback-porch:0";
+ clock-frequency = <&timing>, "clock-frequency:0";
+
+ width-mm = <&panel>, "width-mm:0";
+ height-mm = <&panel>, "height-mm:0";
+
+ /* optional gpios */
+ reset-gpio = <&panel>, "reset-gpios:0=", <&gpio>,
+ <&panel>, "reset-gpios:4",
+ <&panel>, "reset-gpios:8=0"; /* GPIO_ACTIVE_HIGH */
+ dc-gpio = <&panel>, "dc-gpios:0=", <&gpio>,
+ <&panel>, "dc-gpios:4",
+ <&panel>, "dc-gpios:8=0"; /* GPIO_ACTIVE_HIGH */
+
+ backlight-gpio = <0>, "+10+11",
+ <&backlight_gpio>, "gpios:4";
+ backlight-pwm = <0>, "+20+21+22+23+24";
+ backlight-pwm-chan = <&backlight_pwm>, "pwms:4";
+ backlight-pwm-gpio = <&pwm_pins>, "brcm,pins:0";
+ backlight-pwm-func = <&pwm_pins>, "brcm,function:0";
+ backlight-def-brightness = <&backlight_pwm>, "default-brightness-level:0";
+ };
+};
|
