Stuff related to device trees and the Linux kernel, using examples from the current Linux kernel.

To do:

• overlays

General links:

• devicetree.org
• Toradex: Device tree customization
• Thomas Petazzoni's "Device Tree for Dummies"
• NXP: Introduction to Device Trees
• IEEE 1275

Kernel links:

• Documentation/
  • devicetree/
• include/
  • dt-bindings/
• drivers/
  • of/

elinux.org pages:

• Device Tree Reference
• Device Tree Usage
• Device_Tree_Source_Undocumented
• Device_Tree_Mysteries

Xillybus Zynq Device Tree Tutorial:

• Part 1
• Part 2
• Part 3
• Part 4
• Part 5
• Setting up a device tree entry on Altera’s SoC FPGAs

• Device tree naming conventions
• Proper device tree design
• Comparing device trees with dtx_diff

#include "imx6q.dtsi"

/ {
        soc {
        
        ...
        
};

&fec {
        /delete-property/interrupts-extended;
        interrupts = <0 118 IRQ_TYPE_LEVEL_HIGH>,
                     <0 119 IRQ_TYPE_LEVEL_HIGH>;
};

#include "imx6ul.dtsi"
#include "imx6ul-tx6ul.dtsi"

/ {
        model = "Ka-Ro electronics TXUL-0010 Module on TXUL Mainboard";
        compatible = "karo,imx6ul-tx6ul", "fsl,imx6ul";

        aliases {
                lcdif_24bit_pins_a = &pinctrl_disp0_3;
                mmc0 = &usdhc1;
                /delete-property/ mmc1;
                serial2 = &uart3;
                serial4 = &uart5;
        };
        /delete-node/ sound;
};

...

&usdhc1 {
        pinctrl-0 = <&pinctrl_usdhc1>;
        non-removable;
        /delete-property/ cd-gpios;
        cap-sdio-irq;
};

&uart1 {
        pinctrl-0 = <&pinctrl_uart1>;
        /delete-property/ uart-has-rtscts;
};

&uart2 {
        pinctrl-0 = <&pinctrl_uart2>;
        /delete-property/ uart-has-rtscts;
        status = "okay";
};