brcm2708: update to latest patches from RPi Foundation

[openwrt/staging/chunkeey.git] / target / linux / brcm2708 / patches-4.19 / 950-0139-Add-device-tree-overlay-for-HD44780.patch

diff --git a/target/linux/brcm2708/patches-4.19/950-0139-Add-device-tree-overlay-for-HD44780.patch b/target/linux/brcm2708/patches-4.19/950-0139-Add-device-tree-overlay-for-HD44780.patch
new file mode 100644 (file)
index 0000000..f48b8ea
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.19/950-0139-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";
++    };
++
++};