diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.19/950-0143-Add-device-tree-overlay-for-HD44780.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.19/950-0143-Add-device-tree-overlay-for-HD44780.patch | 105 |
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"; ++ }; ++ ++}; |