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-rw-r--r--target/linux/brcm2708/patches-4.19/950-0143-Add-device-tree-overlay-for-HD44780.patch105
1 files changed, 105 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.19/950-0143-Add-device-tree-overlay-for-HD44780.patch b/target/linux/brcm2708/patches-4.19/950-0143-Add-device-tree-overlay-for-HD44780.patch
new file mode 100644
index 0000000000..f48b8eab99
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.19/950-0143-Add-device-tree-overlay-for-HD44780.patch
@@ -0,0 +1,105 @@
+From b5ec75dab38af2429278df48121642cb5605e318 Mon Sep 17 00:00:00 2001
+From: Jasper Boomer <jasperboomer@gmail.com>
+Date: Sun, 24 Jun 2018 12:20:27 -0400
+Subject: [PATCH] Add device tree overlay for HD44780
+
+---
+ arch/arm/boot/dts/overlays/Makefile | 1 +
+ arch/arm/boot/dts/overlays/README | 25 ++++++++++
+ .../boot/dts/overlays/hd44780-lcd-overlay.dts | 46 +++++++++++++++++++
+ 3 files changed, 72 insertions(+)
+ create mode 100644 arch/arm/boot/dts/overlays/hd44780-lcd-overlay.dts
+
+--- a/arch/arm/boot/dts/overlays/Makefile
++++ b/arch/arm/boot/dts/overlays/Makefile
+@@ -38,6 +38,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
+ gpio-no-irq.dtbo \
+ gpio-poweroff.dtbo \
+ gpio-shutdown.dtbo \
++ hd44780-lcd.dtbo \
+ hifiberry-amp.dtbo \
+ hifiberry-dac.dtbo \
+ hifiberry-dacplus.dtbo \
+--- a/arch/arm/boot/dts/overlays/README
++++ b/arch/arm/boot/dts/overlays/README
+@@ -639,6 +639,31 @@ Params: gpio_pin GPIO pin
+ external pullup.
+
+
++Name: hd44780-lcd
++Info: Configures an HD44780 compatible LCD display. Uses 4 gpio pins for
++ data, 2 gpio pins for enable and register select and 1 optional pin
++ for enabling/disabling the backlight display.
++Load: dtoverlay=hd44780-lcd,<param>=<val>
++Params: pin_d4 GPIO pin for data pin D4 (default 6)
++
++ pin_d5 GPIO pin for data pin D5 (default 13)
++
++ pin_d6 GPIO pin for data pin D6 (default 19)
++
++ pin_d7 GPIO pin for data pin D7 (default 26)
++
++ pin_en GPIO pin for "Enable" (default 21)
++
++ pin_rs GPIO pin for "Register Select" (default 20)
++
++ pin_bl Optional pin for enabling/disabling the
++ display backlight. (default disabled)
++
++ display_height Height of the display in characters
++
++ display_width Width of the display in characters
++
++
+ Name: hifiberry-amp
+ Info: Configures the HifiBerry Amp and Amp+ audio cards
+ Load: dtoverlay=hifiberry-amp
+--- /dev/null
++++ b/arch/arm/boot/dts/overlays/hd44780-lcd-overlay.dts
+@@ -0,0 +1,46 @@
++/dts-v1/;
++/plugin/;
++
++/ {
++ compatible = "brcm,bcm2835";
++
++ fragment@0 {
++ target-path = "/";
++ __overlay__ {
++ lcd_screen: auxdisplay {
++ compatible = "hit,hd44780";
++
++ data-gpios = <&gpio 6 0>,
++ <&gpio 13 0>,
++ <&gpio 19 0>,
++ <&gpio 26 0>;
++ enable-gpios = <&gpio 21 0>;
++ rs-gpios = <&gpio 20 0>;
++
++ display-height-chars = <2>;
++ display-width-chars = <16>;
++ };
++
++ };
++ };
++
++ fragment@1 {
++ target = <&lcd_screen>;
++ __dormant__ {
++ backlight-gpios = <&gpio 12 0>;
++ };
++ };
++
++ __overrides__ {
++ pin_d4 = <&lcd_screen>,"data-gpios:4";
++ pin_d5 = <&lcd_screen>,"data-gpios:16";
++ pin_d6 = <&lcd_screen>,"data-gpios:28";
++ pin_d7 = <&lcd_screen>,"data-gpios:40";
++ pin_en = <&lcd_screen>,"enable-gpios:4";
++ pin_rs = <&lcd_screen>,"rs-gpios:4";
++ pin_bl = <0>,"+1", <&lcd_screen>,"backlight-gpios:4";
++ display_height = <&lcd_screen>,"display-height-chars:0";
++ display_width = <&lcd_screen>,"display-width-chars:0";
++ };
++
++};