Commit 3bd98d89 authored by Jasper Boomer's avatar Jasper Boomer Committed by popcornmix
Browse files

Add device tree overlay for HD44780

parent 4245d6db

arch/arm/boot/dts/overlays/Makefile

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@@ -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 \

arch/arm/boot/dts/overlays/README

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@@ -639,6 +639,31 @@ Params: gpio_pin GPIO pin to trigger on (default 3) 
                                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

arch/arm/boot/dts/overlays/hd44780-lcd-overlay.dts

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/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";

    };



};