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106 lines
3.4 KiB
Diff
106 lines
3.4 KiB
Diff
From b5ec75dab38af2429278df48121642cb5605e318 Mon Sep 17 00:00:00 2001
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From: Jasper Boomer <jasperboomer@gmail.com>
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Date: Sun, 24 Jun 2018 12:20:27 -0400
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Subject: [PATCH 155/806] Add device tree overlay for HD44780
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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 | 25 ++++++++++
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.../boot/dts/overlays/hd44780-lcd-overlay.dts | 46 +++++++++++++++++++
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3 files changed, 72 insertions(+)
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create mode 100644 arch/arm/boot/dts/overlays/hd44780-lcd-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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@@ -38,6 +38,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
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gpio-no-irq.dtbo \
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gpio-poweroff.dtbo \
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gpio-shutdown.dtbo \
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+ hd44780-lcd.dtbo \
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hifiberry-amp.dtbo \
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hifiberry-dac.dtbo \
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hifiberry-dacplus.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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@@ -639,6 +639,31 @@ Params: gpio_pin GPIO pin
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external pullup.
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+Name: hd44780-lcd
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+Info: Configures an HD44780 compatible LCD display. Uses 4 gpio pins for
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+ data, 2 gpio pins for enable and register select and 1 optional pin
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+ for enabling/disabling the backlight display.
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+Load: dtoverlay=hd44780-lcd,<param>=<val>
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+Params: pin_d4 GPIO pin for data pin D4 (default 6)
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+
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+ pin_d5 GPIO pin for data pin D5 (default 13)
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+
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+ pin_d6 GPIO pin for data pin D6 (default 19)
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+
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+ pin_d7 GPIO pin for data pin D7 (default 26)
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+
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+ pin_en GPIO pin for "Enable" (default 21)
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+
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+ pin_rs GPIO pin for "Register Select" (default 20)
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+
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+ pin_bl Optional pin for enabling/disabling the
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+ display backlight. (default disabled)
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+
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+ display_height Height of the display in characters
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+
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+ display_width Width of the display in characters
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+
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+
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Name: hifiberry-amp
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Info: Configures the HifiBerry Amp and Amp+ audio cards
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Load: dtoverlay=hifiberry-amp
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--- /dev/null
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+++ b/arch/arm/boot/dts/overlays/hd44780-lcd-overlay.dts
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@@ -0,0 +1,46 @@
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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,bcm2835";
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+
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+ fragment@0 {
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+ target-path = "/";
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+ __overlay__ {
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+ lcd_screen: auxdisplay {
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+ compatible = "hit,hd44780";
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+
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+ data-gpios = <&gpio 6 0>,
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+ <&gpio 13 0>,
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+ <&gpio 19 0>,
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+ <&gpio 26 0>;
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+ enable-gpios = <&gpio 21 0>;
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+ rs-gpios = <&gpio 20 0>;
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+
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+ display-height-chars = <2>;
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+ display-width-chars = <16>;
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+ };
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+
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+ };
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+ };
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+
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+ fragment@1 {
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+ target = <&lcd_screen>;
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+ __dormant__ {
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+ backlight-gpios = <&gpio 12 0>;
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+ };
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+ };
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+
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+ __overrides__ {
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+ pin_d4 = <&lcd_screen>,"data-gpios:4";
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+ pin_d5 = <&lcd_screen>,"data-gpios:16";
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+ pin_d6 = <&lcd_screen>,"data-gpios:28";
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+ pin_d7 = <&lcd_screen>,"data-gpios:40";
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+ pin_en = <&lcd_screen>,"enable-gpios:4";
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+ pin_rs = <&lcd_screen>,"rs-gpios:4";
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+ pin_bl = <0>,"+1", <&lcd_screen>,"backlight-gpios:4";
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+ display_height = <&lcd_screen>,"display-height-chars:0";
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+ display_width = <&lcd_screen>,"display-width-chars:0";
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+ };
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+
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+};
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