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7d7aa2fd92
This change makes the names of Broadcom targets consistent by using the common notation based on SoC/CPU ID (which is used internally anyway), bcmXXXX instead of brcmXXXX. This is even used for target TITLE in make menuconfig already, only the short target name used brcm so far. Despite, since subtargets range from bcm2708 to bcm2711, it seems appropriate to use bcm27xx instead of bcm2708 (again, as already done for BOARDNAME). This also renames the packages brcm2708-userland and brcm2708-gpu-fw. Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de> Acked-by: Álvaro Fernández Rojas <noltari@gmail.com>
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] 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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