1. はじめに
Zephyr の深淵へようこそ。
本記事は、Zephyr 最大の鬼門と思われる Devicetree を覗き込む内容となります。
まだ序章に触れていない方は、まずはそちらを読み終えてからを推奨します。
また、闇が深すぎたため本編の記事を３つに分けております。
其の壱である本記事は、dts と dtsi を追いかけながら、それぞれどんな意図や内容が記述されているのかを解説していきます。
[工事中]
今回は以下の環境で話を進めます。
ターゲットを動かすわけではないですが、手元でも追いかけたい場合はこちらに沿って事前に準備しておいてください。
| board | Zephyr 環境 | ビルド対象のアプリ |
|---|---|---|
| rpi_pico | ~/zephyrproject | zephyr/sample/basic/minimal |
※board が序章と異なる事に意味はありません。
2. 序章のおさらい
深淵では、序章でさらっと流した下記テーブルを深堀する内容となります。其の壱では、序章で触れなかった *.dtsi を解説しつつ、各フォーマットやルールなどにも触れていきます。
| ファイル名 | 概要 |
|---|---|
| *.dts | Devicetree source. これにベースに下記ファイルが連結されていく |
| *.dtsi | dts から include して定義を追加できるようにしたファイル |
| *.overlay | dts の定義を上書きで変更を加えるためのファイル |
| *.yaml | dts / overlay 内で利用する左辺値(プロパティ名)の定義 |
| *.h | dts / overlay 内で利用する右辺値(プロパティ値)の定義 |
| zephyr.dts | ビルド時に上記ファイル群が結合され、最終的な dts として生成 |
3. zephyr.dts の確認
まずはビルドして最終的な zephyr.dts を生成します。
zephyr/sample/basic/minimal を rpi_pico 向けにビルド
$ cd ~/zephyrproject
$ source .venv/bin/activate
$ rm -rf build/; west build -b rpi_pico zephyr/samples/basic/minimal/
:
[143/143] Linking C executable zephyr/zephyr.elf
Memory region Used Size Region Size %age Used
BOOT_FLASH: 256 B 256 B 100.00%
FLASH: 15508 B 2096896 B 0.74%
RAM: 3968 B 264 KB 1.47%
IDT_LIST: 0 GB 32 KB 0.00%
Generating files from /home/taka/zephyrporject/build/zephyr/zephyr.elf for board: rpi_pico
Converted to uf2, output size: 31744, start address: 0x10000000
Wrote 31744 bytes to zephyr.uf2
生成が成功すると build/zephyr/zephyr.dts に吐き出されます。
生成された zephyr.dts の中身
/dts-v1/;
/* node '/' defined in zephyr/dts/common/skeleton.dtsi:9 */
/ {
#address-cells = < 0x1 >; /* in zephyr/dts/common/skeleton.dtsi:10 */
#size-cells = < 0x1 >; /* in zephyr/dts/common/skeleton.dtsi:11 */
/* node '/chosen' defined in zephyr/dts/common/skeleton.dtsi:12 */
chosen {
zephyr,sram = &sram0; /* in zephyr/boards/raspberrypi/rpi_pico/rpi_pico-common.dtsi:18 */
zephyr,flash = &flash0; /* in zephyr/boards/raspberrypi/rpi_pico/rpi_pico-common.dtsi:19 */
zephyr,flash-controller = &ssi; /* in zephyr/boards/raspberrypi/rpi_pico/rpi_pico-common.dtsi:20 */
zephyr,console = &uart0; /* in zephyr/boards/raspberrypi/rpi_pico/rpi_pico-common.dtsi:21 */
zephyr,shell-uart = &uart0; /* in zephyr/boards/raspberrypi/rpi_pico/rpi_pico-common.dtsi:22 */
zephyr,code-partition = &code_partition; /* in zephyr/boards/raspberrypi/rpi_pico/rpi_pico-common.dtsi:23 */
};
/* node '/aliases' defined in zephyr/dts/common/skeleton.dtsi:13 */
aliases {
die-temp0 = &die_temp; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:28 */
rtc = &rtc; /* in zephyr/boards/raspberrypi/rpi_pico/rpi_pico-common.dtsi:27 */
watchdog0 = &wdt0; /* in zephyr/boards/raspberrypi/rpi_pico/rpi_pico-common.dtsi:28 */
led0 = &led0; /* in zephyr/boards/raspberrypi/common/rpi_pico-led.dtsi:27 */
pwm-led0 = &pwm_led0; /* in zephyr/boards/raspberrypi/common/rpi_pico-led.dtsi:28 */
};
/* node '/soc' defined in zephyr/dts/arm/armv6-m.dtsi:6 */
soc {
#address-cells = < 0x1 >; /* in zephyr/dts/arm/armv6-m.dtsi:7 */
#size-cells = < 0x1 >; /* in zephyr/dts/arm/armv6-m.dtsi:8 */
interrupt-parent = < &nvic >; /* in zephyr/dts/arm/armv6-m.dtsi:10 */
ranges; /* in zephyr/dts/arm/armv6-m.dtsi:11 */
compatible = "raspberrypi,rp2040",
"simple-bus"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:190 */
/* node '/soc/interrupt-controller@e000e100' defined in zephyr/dts/arm/armv6-m.dtsi:13 */
nvic: interrupt-controller@e000e100 {
#address-cells = < 0x1 >; /* in zephyr/dts/arm/armv6-m.dtsi:14 */
compatible = "arm,v6m-nvic"; /* in zephyr/dts/arm/armv6-m.dtsi:15 */
reg = < 0xe000e100 0xc00 >; /* in zephyr/dts/arm/armv6-m.dtsi:16 */
interrupt-controller; /* in zephyr/dts/arm/armv6-m.dtsi:17 */
#interrupt-cells = < 0x2 >; /* in zephyr/dts/arm/armv6-m.dtsi:18 */
arm,num-irq-priority-bits = < 0x2 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:448 */
phandle = < 0x1 >; /* in zephyr/dts/arm/armv6-m.dtsi:10 */
};
/* node '/soc/timer@e000e010' defined in zephyr/dts/arm/armv6-m.dtsi:21 */
systick: timer@e000e010 {
compatible = "arm,armv6m-systick"; /* in zephyr/dts/arm/armv6-m.dtsi:22 */
reg = < 0xe000e010 0x10 >; /* in zephyr/dts/arm/armv6-m.dtsi:23 */
};
/* node '/soc/memory@20000000' defined in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:192 */
sram0: memory@20000000 {
compatible = "mmio-sram"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:193 */
reg = < 0x20000000 0x42000 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:194 */
};
/* node '/soc/flash-controller@18000000' defined in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:197 */
ssi: flash-controller@18000000 {
compatible = "raspberrypi,pico-flash-controller"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:198 */
reg = < 0x18000000 0xfc >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:199 */
#address-cells = < 0x1 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:201 */
#size-cells = < 0x1 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:202 */
/* node '/soc/flash-controller@18000000/flash@10000000' defined in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:204 */
flash0: flash@10000000 {
compatible = "soc-nv-flash"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:205 */
write-block-size = < 0x1 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:206 */
erase-block-size = < 0x1000 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:207 */
reg = < 0x10000000 0x200000 >; /* in zephyr/boards/raspberrypi/rpi_pico/rpi_pico-common.dtsi:66 */
/* node '/soc/flash-controller@18000000/flash@10000000/partitions' defined in zephyr/boards/raspberrypi/rpi_pico/rpi_pico-common.dtsi:68 */
partitions {
compatible = "fixed-partitions"; /* in zephyr/boards/raspberrypi/rpi_pico/rpi_pico-common.dtsi:69 */
#address-cells = < 0x1 >; /* in zephyr/boards/raspberrypi/rpi_pico/rpi_pico-common.dtsi:70 */
#size-cells = < 0x1 >; /* in zephyr/boards/raspberrypi/rpi_pico/rpi_pico-common.dtsi:71 */
/* node '/soc/flash-controller@18000000/flash@10000000/partitions/partition@0' defined in zephyr/boards/raspberrypi/rpi_pico/rpi_pico-common.dtsi:74 */
second_stage_bootloader: partition@0 {
label = "second_stage_bootloader"; /* in zephyr/boards/raspberrypi/rpi_pico/rpi_pico-common.dtsi:75 */
reg = < 0x0 0x100 >; /* in zephyr/boards/raspberrypi/rpi_pico/rpi_pico-common.dtsi:76 */
read-only; /* in zephyr/boards/raspberrypi/rpi_pico/rpi_pico-common.dtsi:77 */
};
/* node '/soc/flash-controller@18000000/flash@10000000/partitions/partition@100' defined in zephyr/boards/raspberrypi/rpi_pico/rpi_pico-common.dtsi:84 */
code_partition: partition@100 {
label = "code-partition"; /* in zephyr/boards/raspberrypi/rpi_pico/rpi_pico-common.dtsi:85 */
reg = < 0x100 0x1fff00 >; /* in zephyr/boards/raspberrypi/rpi_pico/rpi_pico-common.dtsi:86 */
read-only; /* in zephyr/boards/raspberrypi/rpi_pico/rpi_pico-common.dtsi:87 */
};
};
};
};
/* node '/soc/reset-controller@4000c000' defined in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:211 */
reset: reset-controller@4000c000 {
compatible = "raspberrypi,pico-reset"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:212 */
reg = < 0x4000c000 0x1000 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:213 */
reg-width = < 0x4 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:214 */
active-low = < 0x0 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:215 */
#reset-cells = < 0x1 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:216 */
phandle = < 0x15 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:268 */
};
/* node '/soc/clock-controller@40008000' defined in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:219 */
clocks: clock-controller@40008000 {
compatible = "raspberrypi,pico-clock-controller"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:220 */
reg = < 0x40008000 0x1000 0x40024000 0x1000 0x40028000 0x1000 0x4002c000 0x1000 0x40060000
0x1000 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:221 */
reg-names = "clocks",
"xosc",
"pll_sys",
"pll_usb",
"rosc"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:226 */
#clock-cells = < 0x1 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:227 */
status = "okay"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:228 */
clocks = < &clk_gpout0 >,
< &clk_gpout1 >,
< &clk_gpout2 >,
< &clk_gpout3 >,
< &clk_ref >,
< &clk_sys >,
< &clk_peri >,
< &clk_usb >,
< &clk_adc >,
< &clk_rtc >,
< &pll_sys >,
< &pll_usb >,
< &xosc >,
< &rosc >,
< &rosc_ph >,
< &gpin0 >,
< &gpin1 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:229 */
clock-names = "clk_gpout0",
"clk_gpout1",
"clk_gpout2",
"clk_gpout3",
"clk_ref",
"clk_sys",
"clk_peri",
"clk_usb",
"clk_adc",
"clk_rtc",
"pll_sys",
"pll_usb",
"xosc",
"rosc",
"rosc_ph",
"gpin0",
"gpin1"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:234 */
phandle = < 0x14 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:267 */
};
/* node '/soc/gpio@40014000' defined in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:241 */
gpio0_map: gpio@40014000 {
compatible = "raspberrypi,pico-gpio"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:242 */
reg = < 0x40014000 0x1000 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:243 */
interrupts = < 0xd 0x3 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:244 */
gpio-map-mask = < 0xffffffe0 0xffffffc0 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:246 */
gpio-map-pass-thru = < 0x1f 0x3f >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:247 */
gpio-map = < 0x0 0x0 &gpio0 0x0 0x0 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:248 */
#gpio-cells = < 0x2 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:250 */
#address-cells = < 0x1 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:251 */
#size-cells = < 0x0 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:252 */
/* node '/soc/gpio@40014000/gpio-port@0' defined in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:254 */
gpio0: gpio-port@0 {
compatible = "raspberrypi,pico-gpio-port"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:255 */
reg = < 0x0 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:256 */
gpio-controller; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:258 */
#gpio-cells = < 0x2 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:259 */
ngpios = < 0x1e >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:260 */
status = "okay"; /* in zephyr/boards/raspberrypi/rpi_pico/rpi_pico-common.dtsi:100 */
phandle = < 0x13 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:248 */
};
};
/* node '/soc/uart@40034000' defined in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:264 */
uart0: pico_serial: uart@40034000 {
compatible = "raspberrypi,pico-uart",
"arm,pl011"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:265 */
reg = < 0x40034000 0x1000 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:266 */
clocks = < &clocks 0x6 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:267 */
resets = < &reset 0x16 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:268 */
interrupts = < 0x14 0x3 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:269 */
interrupt-names = "uart0"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:270 */
current-speed = < 0x1c200 >; /* in zephyr/boards/raspberrypi/rpi_pico/rpi_pico-common.dtsi:93 */
status = "okay"; /* in zephyr/boards/raspberrypi/rpi_pico/rpi_pico-common.dtsi:94 */
pinctrl-0 = < &uart0_default >; /* in zephyr/boards/raspberrypi/rpi_pico/rpi_pico-common.dtsi:95 */
pinctrl-names = "default"; /* in zephyr/boards/raspberrypi/rpi_pico/rpi_pico-common.dtsi:96 */
};
/* node '/soc/uart@40038000' defined in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:274 */
uart1: uart@40038000 {
compatible = "raspberrypi,pico-uart",
"arm,pl011"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:275 */
reg = < 0x40038000 0x1000 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:276 */
clocks = < &clocks 0x6 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:277 */
resets = < &reset 0x17 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:278 */
interrupts = < 0x15 0x3 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:279 */
interrupt-names = "uart1"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:280 */
status = "disabled"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:281 */
};
/* node '/soc/spi@4003c000' defined in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:284 */
spi0: pico_spi: spi@4003c000 {
compatible = "raspberrypi,pico-spi",
"arm,pl022"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:285 */
#address-cells = < 0x1 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:286 */
#size-cells = < 0x0 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:287 */
reg = < 0x4003c000 0x1000 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:288 */
clocks = < &clocks 0x6 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:289 */
resets = < &reset 0x10 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:290 */
interrupts = < 0x12 0x3 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:291 */
interrupt-names = "spi0"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:292 */
clock-frequency = < 0x7a1200 >; /* in zephyr/boards/raspberrypi/rpi_pico/rpi_pico-common.dtsi:118 */
status = "okay"; /* in zephyr/boards/raspberrypi/rpi_pico/rpi_pico-common.dtsi:119 */
pinctrl-0 = < &spi0_default >; /* in zephyr/boards/raspberrypi/rpi_pico/rpi_pico-common.dtsi:120 */
pinctrl-names = "default"; /* in zephyr/boards/raspberrypi/rpi_pico/rpi_pico-common.dtsi:121 */
};
/* node '/soc/spi@40040000' defined in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:296 */
spi1: spi@40040000 {
compatible = "raspberrypi,pico-spi",
"arm,pl022"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:297 */
#address-cells = < 0x1 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:298 */
#size-cells = < 0x0 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:299 */
reg = < 0x40040000 0x1000 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:300 */
resets = < &reset 0x11 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:301 */
clocks = < &clocks 0x6 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:302 */
interrupts = < 0x13 0x3 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:303 */
interrupt-names = "spi1"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:304 */
status = "disabled"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:305 */
};
/* node '/soc/adc@4004c000' defined in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:308 */
adc: adc@4004c000 {
compatible = "raspberrypi,pico-adc"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:309 */
reg = < 0x4004c000 0x1000 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:310 */
resets = < &reset 0x0 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:311 */
clocks = < &clocks 0x8 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:312 */
interrupts = < 0x16 0x3 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:313 */
interrupt-names = "adc0"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:314 */
#io-channel-cells = < 0x1 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:316 */
status = "okay"; /* in zephyr/boards/raspberrypi/rpi_pico/rpi_pico-common.dtsi:138 */
pinctrl-0 = < &adc_default >; /* in zephyr/boards/raspberrypi/rpi_pico/rpi_pico-common.dtsi:139 */
pinctrl-names = "default"; /* in zephyr/boards/raspberrypi/rpi_pico/rpi_pico-common.dtsi:140 */
phandle = < 0x1c >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:442 */
};
/* node '/soc/i2c@40044000' defined in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:319 */
i2c0: pico_i2c0: i2c@40044000 {
compatible = "raspberrypi,pico-i2c",
"snps,designware-i2c"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:320 */
#address-cells = < 0x1 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:321 */
#size-cells = < 0x0 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:322 */
reg = < 0x40044000 0x1000 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:323 */
resets = < &reset 0x3 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:324 */
clocks = < &clocks 0x5 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:325 */
interrupts = < 0x17 0x3 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:326 */
interrupt-names = "i2c0"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:327 */
clock-frequency = < 0x186a0 >; /* in zephyr/boards/raspberrypi/rpi_pico/rpi_pico-common.dtsi:104 */
status = "okay"; /* in zephyr/boards/raspberrypi/rpi_pico/rpi_pico-common.dtsi:105 */
pinctrl-0 = < &i2c0_default >; /* in zephyr/boards/raspberrypi/rpi_pico/rpi_pico-common.dtsi:106 */
pinctrl-names = "default"; /* in zephyr/boards/raspberrypi/rpi_pico/rpi_pico-common.dtsi:107 */
};
/* node '/soc/i2c@40048000' defined in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:331 */
i2c1: pico_i2c1: i2c@40048000 {
compatible = "raspberrypi,pico-i2c",
"snps,designware-i2c"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:332 */
#address-cells = < 0x1 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:333 */
#size-cells = < 0x0 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:334 */
reg = < 0x40048000 0x1000 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:335 */
resets = < &reset 0x4 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:336 */
clocks = < &clocks 0x5 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:337 */
interrupts = < 0x18 0x3 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:338 */
interrupt-names = "i2c1"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:339 */
pinctrl-0 = < &i2c1_default >; /* in zephyr/boards/raspberrypi/rpi_pico/rpi_pico-common.dtsi:111 */
pinctrl-names = "default"; /* in zephyr/boards/raspberrypi/rpi_pico/rpi_pico-common.dtsi:112 */
status = "disabled"; /* in zephyr/boards/raspberrypi/rpi_pico/rpi_pico-common.dtsi:113 */
clock-frequency = < 0x61a80 >; /* in zephyr/boards/raspberrypi/rpi_pico/rpi_pico-common.dtsi:114 */
};
/* node '/soc/watchdog@40058000' defined in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:343 */
wdt0: watchdog@40058000 {
compatible = "raspberrypi,pico-watchdog"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:344 */
reg = < 0x40058000 0x1000 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:345 */
clocks = < &clocks 0x4 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:346 */
status = "okay"; /* in zephyr/boards/raspberrypi/rpi_pico/rpi_pico-common.dtsi:129 */
};
/* node '/soc/usbd@50110000' defined in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:350 */
usbd: zephyr_udc0: usbd@50110000 {
compatible = "raspberrypi,pico-usbd"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:351 */
reg = < 0x50110000 0x10000 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:352 */
resets = < &reset 0x18 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:353 */
clocks = < &clocks 0x7 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:354 */
interrupts = < 0x5 0x3 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:355 */
interrupt-names = "usbctrl"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:356 */
num-bidir-endpoints = < 0x10 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:357 */
status = "okay"; /* in zephyr/boards/raspberrypi/rpi_pico/rpi_pico-common.dtsi:144 */
};
/* node '/soc/pwm@40050000' defined in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:361 */
pwm: pwm@40050000 {
compatible = "raspberrypi,pico-pwm"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:362 */
reg = < 0x40050000 0x1000 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:363 */
resets = < &reset 0xe >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:364 */
clocks = < &clocks 0x5 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:365 */
interrupts = < 0x4 0x3 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:366 */
interrupt-names = "PWM_IRQ_WRAP"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:367 */
status = "disabled"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:368 */
#pwm-cells = < 0x3 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:369 */
pinctrl-0 = < &pwm_ch4b_default >; /* in zephyr/boards/raspberrypi/rpi_pico/rpi_pico-common.dtsi:148 */
pinctrl-names = "default"; /* in zephyr/boards/raspberrypi/rpi_pico/rpi_pico-common.dtsi:149 */
phandle = < 0x1d >; /* in zephyr/boards/raspberrypi/common/rpi_pico-led.dtsi:21 */
};
/* node '/soc/timer@40054000' defined in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:372 */
timer: timer@40054000 {
compatible = "raspberrypi,pico-timer"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:373 */
reg = < 0x40054000 0x1000 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:374 */
resets = < &reset 0x15 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:375 */
clocks = < &clocks 0x4 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:376 */
interrupts = < 0x0 0x3 >,
< 0x1 0x3 >,
< 0x2 0x3 >,
< 0x3 0x3 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:377 */
interrupt-names = "TIMER_IRQ_0",
"TIMER_IRQ_1",
"TIMER_IRQ_2",
"TIMER_IRQ_3"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:381 */
status = "okay"; /* in zephyr/boards/raspberrypi/rpi_pico/rpi_pico-common.dtsi:125 */
};
/* node '/soc/dma@50000000' defined in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:388 */
dma: dma@50000000 {
compatible = "raspberrypi,pico-dma"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:389 */
reg = < 0x50000000 0x10000 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:390 */
resets = < &reset 0x2 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:391 */
clocks = < &clocks 0x5 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:392 */
interrupts = < 0xb 0x3 >,
< 0xc 0x3 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:393 */
interrupt-names = "dma0",
"dma1"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:395 */
dma-channels = < 0xc >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:396 */
status = "disabled"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:397 */
#dma-cells = < 0x3 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:398 */
};
/* node '/soc/vreg@40064000' defined in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:401 */
vreg: vreg@40064000 {
compatible = "raspberrypi,core-supply-regulator"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:402 */
reg = < 0x40064000 0x1 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:403 */
status = "okay"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:404 */
raspberrypi,brown-out-detection; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:405 */
raspberrypi,brown-out-threshold = < 0xd1f60 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:406 */
regulator-always-on; /* in zephyr/boards/raspberrypi/rpi_pico/rpi_pico-common.dtsi:153 */
regulator-allowed-modes = < 0x0 >; /* in zephyr/boards/raspberrypi/rpi_pico/rpi_pico-common.dtsi:154 */
};
/* node '/soc/pio@50200000' defined in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:409 */
pio0: pio@50200000 {
compatible = "raspberrypi,pico-pio"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:410 */
reg = < 0x50200000 0x1000 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:411 */
clocks = < &clocks 0x5 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:412 */
resets = < &reset 0xa >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:413 */
status = "disabled"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:414 */
};
/* node '/soc/pio@50300000' defined in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:417 */
pio1: pio@50300000 {
compatible = "raspberrypi,pico-pio"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:418 */
reg = < 0x50300000 0x1000 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:419 */
clocks = < &clocks 0x5 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:420 */
resets = < &reset 0xb >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:421 */
status = "disabled"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:422 */
};
/* node '/soc/rtc@4005c000' defined in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:425 */
rtc: rtc@4005c000 {
compatible = "raspberrypi,pico-rtc"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:426 */
reg = < 0x4005c000 0x1000 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:427 */
interrupts = < 0x19 0x3 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:428 */
interrupt-names = "rtc"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:429 */
resets = < &reset 0xf >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:430 */
alarms-count = < 0x1 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:431 */
clocks = < &clocks 0x9 >; /* in zephyr/boards/raspberrypi/rpi_pico/rpi_pico-common.dtsi:133 */
status = "okay"; /* in zephyr/boards/raspberrypi/rpi_pico/rpi_pico-common.dtsi:134 */
};
};
/* node '/cpus' defined in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:31 */
cpus {
#address-cells = < 0x1 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:32 */
#size-cells = < 0x0 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:33 */
/* node '/cpus/cpu@0' defined in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:35 */
cpu0: cpu@0 {
compatible = "arm,cortex-m0+"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:36 */
reg = < 0x0 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:37 */
};
/* node '/cpus/cpu@1' defined in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:40 */
cpu1: cpu@1 {
compatible = "arm,cortex-m0+"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:41 */
reg = < 0x1 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:42 */
};
};
/* node '/clocks' defined in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:46 */
clocks {
/* node '/clocks/clk-gpout0' defined in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:47 */
clk_gpout0: clk-gpout0 {
compatible = "raspberrypi,pico-clock"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:48 */
clocks = < &pll_sys >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:49 */
clock-names = "pll_sys"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:50 */
clock-frequency = < 0x7735940 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:51 */
#clock-cells = < 0x0 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:52 */
#address-cells = < 0x0 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:53 */
phandle = < 0x2 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:229 */
};
/* node '/clocks/clk-gpout1' defined in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:56 */
clk_gpout1: clk-gpout1 {
compatible = "raspberrypi,pico-clock"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:57 */
clocks = < &pll_sys >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:58 */
clock-names = "pll_sys"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:59 */
clock-frequency = < 0x7735940 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:60 */
#clock-cells = < 0x0 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:61 */
phandle = < 0x3 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:229 */
};
/* node '/clocks/clk-gpout2' defined in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:64 */
clk_gpout2: clk-gpout2 {
compatible = "raspberrypi,pico-clock"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:65 */
clocks = < &pll_sys >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:66 */
clock-names = "pll_sys"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:67 */
clock-frequency = < 0x7735940 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:68 */
#clock-cells = < 0x0 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:69 */
phandle = < 0x4 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:229 */
};
/* node '/clocks/clk-gpout3' defined in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:72 */
clk_gpout3: clk-gpout3 {
compatible = "raspberrypi,pico-clock"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:73 */
clocks = < &pll_sys >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:74 */
clock-names = "pll_sys"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:75 */
clock-frequency = < 0x7735940 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:76 */
#clock-cells = < 0x0 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:77 */
phandle = < 0x5 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:229 */
};
/* node '/clocks/clk-ref' defined in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:80 */
clk_ref: clk-ref {
compatible = "raspberrypi,pico-clock"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:81 */
clocks = < &xosc >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:82 */
clock-names = "xosc"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:83 */
clock-frequency = < 0xb71b00 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:84 */
#clock-cells = < 0x0 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:85 */
phandle = < 0x6 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:229 */
};
/* node '/clocks/clk-sys' defined in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:88 */
clk_sys: clk-sys {
compatible = "raspberrypi,pico-clock"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:89 */
clocks = < &pll_sys >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:90 */
clock-names = "pll_sys"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:91 */
clock-frequency = < 0x7735940 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:92 */
#clock-cells = < 0x0 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:93 */
phandle = < 0x7 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:229 */
};
/* node '/clocks/clk-usb' defined in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:96 */
clk_usb: clk-usb {
compatible = "raspberrypi,pico-clock"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:97 */
clocks = < &pll_usb >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:98 */
clock-names = "pll_usb"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:99 */
clock-frequency = < 0x2dc6c00 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:100 */
#clock-cells = < 0x0 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:101 */
phandle = < 0x9 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:229 */
};
/* node '/clocks/clk-adc' defined in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:104 */
clk_adc: clk-adc {
compatible = "raspberrypi,pico-clock"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:105 */
clocks = < &pll_usb >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:106 */
clock-names = "pll_usb"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:107 */
clock-frequency = < 0x2dc6c00 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:108 */
#clock-cells = < 0x0 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:109 */
phandle = < 0xa >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:229 */
};
/* node '/clocks/clk-rtc' defined in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:112 */
clk_rtc: clk-rtc {
compatible = "raspberrypi,pico-clock"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:113 */
clocks = < &pll_usb >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:114 */
clock-names = "pll_usb"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:115 */
clock-frequency = < 0xb71b >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:116 */
#clock-cells = < 0x0 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:117 */
phandle = < 0xb >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:229 */
};
/* node '/clocks/clk-peri' defined in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:120 */
clk_peri: clk-peri {
compatible = "raspberrypi,pico-clock"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:121 */
clocks = < &clk_sys >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:122 */
clock-names = "clk_sys"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:123 */
clock-frequency = < 0x7735940 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:124 */
#clock-cells = < 0x0 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:125 */
phandle = < 0x8 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:229 */
};
/* node '/clocks/pll-sys' defined in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:128 */
pll_sys: pll-sys {
compatible = "raspberrypi,pico-pll"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:129 */
clocks = < &xosc >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:130 */
clock-names = "xosc"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:131 */
clock-div = < 0x1 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:132 */
fb-div = < 0x7d >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:133 */
post-div1 = < 0x6 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:134 */
post-div2 = < 0x2 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:135 */
#clock-cells = < 0x0 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:136 */
phandle = < 0xc >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:229 */
};
/* node '/clocks/pll-usb' defined in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:139 */
pll_usb: pll-usb {
compatible = "raspberrypi,pico-pll"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:140 */
clocks = < &xosc >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:141 */
clock-names = "xosc"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:142 */
clock-div = < 0x1 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:143 */
fb-div = < 0x64 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:144 */
post-div1 = < 0x5 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:145 */
post-div2 = < 0x5 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:146 */
#clock-cells = < 0x0 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:147 */
phandle = < 0xd >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:229 */
};
/* node '/clocks/rosc' defined in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:150 */
rosc: rosc {
compatible = "raspberrypi,pico-rosc"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:151 */
clock-frequency = < 0x632ea0 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:152 */
range = < 0xaa0 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:153 */
stage-drive-strength = < 0x0 >,
< 0x0 >,
< 0x0 >,
< 0x0 >,
< 0x0 >,
< 0x0 >,
< 0x0 >,
< 0x0 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:154 */
clock-div = < 0x10 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:155 */
phase = < 0x0 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:156 */
#clock-cells = < 0x0 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:157 */
phandle = < 0xf >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:229 */
};
/* node '/clocks/rosc-ph' defined in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:160 */
rosc_ph: rosc-ph {
compatible = "raspberrypi,pico-clock"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:161 */
clock-frequency = < 0x632ea0 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:162 */
clocks = < &rosc >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:163 */
clock-names = "rosc"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:164 */
#clock-cells = < 0x0 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:165 */
phandle = < 0x10 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:229 */
};
/* node '/clocks/xosc' defined in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:168 */
xosc: xosc {
compatible = "raspberrypi,pico-xosc"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:169 */
clock-frequency = < 0xb71b00 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:170 */
#clock-cells = < 0x0 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:171 */
phandle = < 0xe >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:229 */
};
/* node '/clocks/gpin0' defined in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:174 */
gpin0: gpin0 {
compatible = "raspberrypi,pico-clock"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:175 */
status = "disabled"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:176 */
clock-frequency = < 0x0 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:177 */
#clock-cells = < 0x0 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:178 */
phandle = < 0x11 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:229 */
};
/* node '/clocks/gpin1' defined in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:181 */
gpin1: gpin1 {
compatible = "raspberrypi,pico-clock"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:182 */
status = "disabled"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:183 */
clock-frequency = < 0x0 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:184 */
#clock-cells = < 0x0 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:185 */
phandle = < 0x12 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:229 */
};
};
/* node '/pin-controller' defined in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:436 */
pinctrl: pin-controller {
compatible = "raspberrypi,pico-pinctrl"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:437 */
/* node '/pin-controller/uart0_default' defined in zephyr/boards/raspberrypi/common/rpi_pico-pinctrl-common.dtsi:8 */
uart0_default: uart0_default {
phandle = < 0x16 >; /* in zephyr/boards/raspberrypi/rpi_pico/rpi_pico-common.dtsi:95 */
/* node '/pin-controller/uart0_default/group1' defined in zephyr/boards/raspberrypi/common/rpi_pico-pinctrl-common.dtsi:9 */
group1 {
pinmux = < 0x2 >; /* in zephyr/boards/raspberrypi/common/rpi_pico-pinctrl-common.dtsi:10 */
};
/* node '/pin-controller/uart0_default/group2' defined in zephyr/boards/raspberrypi/common/rpi_pico-pinctrl-common.dtsi:12 */
group2 {
pinmux = < 0x22 >; /* in zephyr/boards/raspberrypi/common/rpi_pico-pinctrl-common.dtsi:13 */
input-enable; /* in zephyr/boards/raspberrypi/common/rpi_pico-pinctrl-common.dtsi:14 */
};
};
/* node '/pin-controller/i2c0_default' defined in zephyr/boards/raspberrypi/common/rpi_pico-pinctrl-common.dtsi:18 */
i2c0_default: i2c0_default {
phandle = < 0x19 >; /* in zephyr/boards/raspberrypi/rpi_pico/rpi_pico-common.dtsi:106 */
/* node '/pin-controller/i2c0_default/group1' defined in zephyr/boards/raspberrypi/common/rpi_pico-pinctrl-common.dtsi:19 */
group1 {
pinmux = < 0x83 >,
< 0xa3 >; /* in zephyr/boards/raspberrypi/common/rpi_pico-pinctrl-common.dtsi:20 */
input-enable; /* in zephyr/boards/raspberrypi/common/rpi_pico-pinctrl-common.dtsi:21 */
input-schmitt-enable; /* in zephyr/boards/raspberrypi/common/rpi_pico-pinctrl-common.dtsi:22 */
};
};
/* node '/pin-controller/i2c1_default' defined in zephyr/boards/raspberrypi/common/rpi_pico-pinctrl-common.dtsi:26 */
i2c1_default: i2c1_default {
phandle = < 0x1a >; /* in zephyr/boards/raspberrypi/rpi_pico/rpi_pico-common.dtsi:111 */
/* node '/pin-controller/i2c1_default/group1' defined in zephyr/boards/raspberrypi/common/rpi_pico-pinctrl-common.dtsi:27 */
group1 {
pinmux = < 0xc3 >,
< 0xe3 >; /* in zephyr/boards/raspberrypi/common/rpi_pico-pinctrl-common.dtsi:28 */
input-enable; /* in zephyr/boards/raspberrypi/common/rpi_pico-pinctrl-common.dtsi:29 */
input-schmitt-enable; /* in zephyr/boards/raspberrypi/common/rpi_pico-pinctrl-common.dtsi:30 */
};
};
/* node '/pin-controller/spi0_default' defined in zephyr/boards/raspberrypi/common/rpi_pico-pinctrl-common.dtsi:34 */
spi0_default: spi0_default {
phandle = < 0x17 >; /* in zephyr/boards/raspberrypi/rpi_pico/rpi_pico-common.dtsi:120 */
/* node '/pin-controller/spi0_default/group1' defined in zephyr/boards/raspberrypi/common/rpi_pico-pinctrl-common.dtsi:35 */
group1 {
pinmux = < 0x221 >,
< 0x241 >,
< 0x261 >; /* in zephyr/boards/raspberrypi/common/rpi_pico-pinctrl-common.dtsi:36 */
};
/* node '/pin-controller/spi0_default/group2' defined in zephyr/boards/raspberrypi/common/rpi_pico-pinctrl-common.dtsi:38 */
group2 {
pinmux = < 0x201 >; /* in zephyr/boards/raspberrypi/common/rpi_pico-pinctrl-common.dtsi:39 */
input-enable; /* in zephyr/boards/raspberrypi/common/rpi_pico-pinctrl-common.dtsi:40 */
};
};
/* node '/pin-controller/pwm_ch4b_default' defined in zephyr/boards/raspberrypi/common/rpi_pico-pinctrl-common.dtsi:44 */
pwm_ch4b_default: pwm_ch4b_default {
phandle = < 0x1b >; /* in zephyr/boards/raspberrypi/rpi_pico/rpi_pico-common.dtsi:148 */
/* node '/pin-controller/pwm_ch4b_default/group1' defined in zephyr/boards/raspberrypi/common/rpi_pico-pinctrl-common.dtsi:45 */
group1 {
pinmux = < 0x324 >; /* in zephyr/boards/raspberrypi/common/rpi_pico-pinctrl-common.dtsi:46 */
};
};
/* node '/pin-controller/adc_default' defined in zephyr/boards/raspberrypi/common/rpi_pico-pinctrl-common.dtsi:50 */
adc_default: adc_default {
phandle = < 0x18 >; /* in zephyr/boards/raspberrypi/rpi_pico/rpi_pico-common.dtsi:139 */
/* node '/pin-controller/adc_default/group1' defined in zephyr/boards/raspberrypi/common/rpi_pico-pinctrl-common.dtsi:51 */
group1 {
pinmux = < 0x34f >,
< 0x36f >,
< 0x38f >,
< 0x3af >; /* in zephyr/boards/raspberrypi/common/rpi_pico-pinctrl-common.dtsi:52 */
input-enable; /* in zephyr/boards/raspberrypi/common/rpi_pico-pinctrl-common.dtsi:53 */
};
};
};
/* node '/dietemp' defined in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:440 */
die_temp: dietemp {
compatible = "raspberrypi,pico-temp"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:441 */
io-channels = < &adc 0x4 >; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:442 */
status = "disabled"; /* in zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi:443 */
};
/* node '/connector' defined in zephyr/boards/raspberrypi/rpi_pico/rpi_pico-common.dtsi:31 */
pico_header: connector {
compatible = "raspberrypi,pico-header"; /* in zephyr/boards/raspberrypi/rpi_pico/rpi_pico-common.dtsi:32 */
#gpio-cells = < 0x2 >; /* in zephyr/boards/raspberrypi/rpi_pico/rpi_pico-common.dtsi:33 */
gpio-map-mask = < 0xffffffff 0xffffffc0 >; /* in zephyr/boards/raspberrypi/rpi_pico/rpi_pico-common.dtsi:34 */
gpio-map-pass-thru = < 0x0 0x3f >; /* in zephyr/boards/raspberrypi/rpi_pico/rpi_pico-common.dtsi:35 */
gpio-map = < 0x0 0x0 &gpio0 0x0 0x0 >,
< 0x1 0x0 &gpio0 0x1 0x0 >,
< 0x2 0x0 &gpio0 0x2 0x0 >,
< 0x3 0x0 &gpio0 0x3 0x0 >,
< 0x4 0x0 &gpio0 0x4 0x0 >,
< 0x5 0x0 &gpio0 0x5 0x0 >,
< 0x6 0x0 &gpio0 0x6 0x0 >,
< 0x7 0x0 &gpio0 0x7 0x0 >,
< 0x8 0x0 &gpio0 0x8 0x0 >,
< 0x9 0x0 &gpio0 0x9 0x0 >,
< 0xa 0x0 &gpio0 0xa 0x0 >,
< 0xb 0x0 &gpio0 0xb 0x0 >,
< 0xc 0x0 &gpio0 0xc 0x0 >,
< 0xd 0x0 &gpio0 0xd 0x0 >,
< 0xe 0x0 &gpio0 0xe 0x0 >,
< 0xf 0x0 &gpio0 0xf 0x0 >,
< 0x10 0x0 &gpio0 0x10 0x0 >,
< 0x11 0x0 &gpio0 0x11 0x0 >,
< 0x12 0x0 &gpio0 0x12 0x0 >,
< 0x13 0x0 &gpio0 0x13 0x0 >,
< 0x14 0x0 &gpio0 0x14 0x0 >,
< 0x15 0x0 &gpio0 0x15 0x0 >,
< 0x16 0x0 &gpio0 0x16 0x0 >,
< 0x1a 0x0 &gpio0 0x1a 0x0 >,
< 0x1b 0x0 &gpio0 0x1b 0x0 >,
< 0x1c 0x0 &gpio0 0x1c 0x0 >; /* in zephyr/boards/raspberrypi/rpi_pico/rpi_pico-common.dtsi:36 */
};
/* node '/leds' defined in zephyr/boards/raspberrypi/common/rpi_pico-led.dtsi:9 */
leds {
compatible = "gpio-leds"; /* in zephyr/boards/raspberrypi/common/rpi_pico-led.dtsi:10 */
/* node '/leds/led_0' defined in zephyr/boards/raspberrypi/common/rpi_pico-led.dtsi:11 */
led0: led_0 {
gpios = < &gpio0 0x19 0x0 >; /* in zephyr/boards/raspberrypi/common/rpi_pico-led.dtsi:12 */
label = "LED"; /* in zephyr/boards/raspberrypi/common/rpi_pico-led.dtsi:13 */
};
};
/* node '/pwm_leds' defined in zephyr/boards/raspberrypi/common/rpi_pico-led.dtsi:17 */
pwm_leds {
compatible = "pwm-leds"; /* in zephyr/boards/raspberrypi/common/rpi_pico-led.dtsi:18 */
status = "disabled"; /* in zephyr/boards/raspberrypi/common/rpi_pico-led.dtsi:19 */
/* node '/pwm_leds/pwm_led_0' defined in zephyr/boards/raspberrypi/common/rpi_pico-led.dtsi:20 */
pwm_led0: pwm_led_0 {
pwms = < &pwm 0x9 0x1312d00 0x0 >; /* in zephyr/boards/raspberrypi/common/rpi_pico-led.dtsi:21 */
label = "PWM_LED"; /* in zephyr/boards/raspberrypi/common/rpi_pico-led.dtsi:22 */
};
};
};
v4.2.0 から dts 生成時に参照した定義ファイルの相対パスと行が残るようになっていました。めちゃくちゃいい改善点ですね。
4. dts を構成するファイルの解説
dts の生成は、基本的に west build -b [board 名] で指定した [board名].dts から始まります。
今回でいうと、west build -b rpi_pico . であるため、zephyr/boards/raspberrypi/rpi_pico/rpi_pico.dts から始まります。
4.1. include される dtsi ファイルの棲み分け
ベースとなる dts は先述の rpi_pico.dts ですが、dts はこれだけで完結しておらず、dtsi や overlay を参照して合成していきます。
そしてそれらは汎用設定と固有設定に分けており、管理しているディレクトリも異なります。
| 種類 | 管理ディレクトリ | 概要 |
|---|---|---|
| 固有 | zephyr/boards | board 固有の設定群が配置 |
| 汎用 | zephyr/dts | アーキテクチャ非依存・依存の設定や SoC の共通設定など |
以下は、rpi_pico で実際に参照される *.dtsi の一部です。
rpi_pico の zephyr.dts を生成する際に参照されている dtsi 群
.
└── zephyr/ # 公式の Zephyr リポジトリ
├── boards/ # boards 依存の設定
│ └── raspberrypi/ # Raspberry Pi 系の固有設定
│ ├── common/ # Raspberry Pi 系の共通設定
│ │ ├── rpi_pico-led.dtsi # RPi 系で共通の LED 設定
│ │ └── rpi_pico-pinctrl-common.dtsi # RPi 系で共通の pin control 設定
│ └── rpi_pico/ # rpi_pico 系の固有設定
│ └── rpi_pico-common.dtsi # rpi_pico の共通設定
└── dts/
├── arm/ # ARM 系の設定
│ ├── armv6-m.dtsi # ARMv6 の基本設定
│ └── raspberrypi/ # Raspberry Pi 系の設定
│ └── rpi_pico/ # RPi Pico 系の設定
│ └── rp2040.dtsi # RP2040 コアの基本設定
└── common/ # アーキテクチャを問わない共通設定
└── skeleton.dtsi # 空定義(枠組み用)
4.2. 実際の展開のされ方を確認
では、実際にファイルの中身を確認してどのように最終的な zephyr.dts が生成されるのか追ってみます。
ただし、すべてのボードがこの rpi_pico と同じような構成ではないため、それを踏まえて読み進めてください。
(傾向としては派生や互換ボードがあれば共通設定に分離され、なければ dts に集約されます)。
4.2.1. 始まりの地、dts
下記は一番最初に参照される rpi_pico.dts です。rpi_pico.dts はこの include だけで、非常にシンプルです。記法もC/C++と同じで馴染み深いかと思います。
(以降、行頭に行数を表記しています。)
zephyr/boards/raspberrypi/rpi_pico/rpi_pico.dts
7 /dts-v1/;
8
9 #include "rpi_pico-common.dtsi"
10 #include "../common/rpi_pico-led.dtsi"
4.2.2. 参照される dtsi たち
では、rpi_pico-common.dtsi を確認してみます。
このファイルには冒頭に chosen と aliases が定義されています。
※ 必ずしも dtsi にこの定義があるとは限りません
| ノード名 | 概要 |
|---|---|
| chosen | デフォルトで使うバスなどを指定するノード。例えば zephyr,console = &uart0; で printk() の標準出力先を uart0 設定することができる |
| aliases | 各ノードを別名でもアクセスできるように設定する。デバイス間で異なる名称や連番などの違いを吸収することができる。 |
zephyr/boards/raspberrypi/rpi_pico/rpi_pico-common.dtsi
7 #include <freq.h>
8
9 #include <raspberrypi/rpi_pico/rp2040.dtsi>
10 #include "rpi_pico-pinctrl.dtsi"
11 #include <zephyr/dt-bindings/pwm/pwm.h>
12
13 #include <zephyr/dt-bindings/i2c/i2c.h>
14
15
16 / {
17 chosen {
18 zephyr,sram = &sram0;
19 zephyr,flash = &flash0;
20 zephyr,flash-controller = &ssi;
21 zephyr,console = &uart0;
22 zephyr,shell-uart = &uart0;
23 zephyr,code-partition = &code_partition;
24 };
25
26 aliases {
27 rtc = &rtc;
28 watchdog0 = &wdt0;
29 };
30
4.2.3. 定義済みのノードへの変更
続いて、同じファイルの中段にある uart0 のノードを確認してみます。このノードの名称には頭に & が付いており、これは定義済みのノードを参照してパラメータを追加したり上書き変更したりする際に用いる表記です。
zephyr/boards/raspberrypi/rpi_pico/rpi_pico-common.dtsi
92 &uart0 {
93 current-speed = <115200>;
94 status = "okay";
95 pinctrl-0 = <&uart0_default>;
96 pinctrl-names = "default";
97 };
これらの設定は以下の通り。
| 変更パラメータ | 解説 |
|---|---|
current-speed = <115200>; |
baud rate を追加・設定 |
status = "okay"; |
uart0 が有効になる設定に上書き |
pinctrl-0 = <&uart0_default>; |
pin の組み合わせである uart0_default を参照して uart0 ノード用に割り当てる |
pinctrl-names = "default"; |
例えば MCU の状態によって一括で pin の状態を切り替えるするために、sleep などの名前を割り当てて運用する |
設定が上書き・追加される前の設定は以下の通り。これをベースに &uart0 側で上書き・追加された設定が反映されることになる。
zephyr/dts/arm/raspberrypi/rpi_pico/rp2040.dtsi
264 uart0: uart@40034000 {
265 compatible = "raspberrypi,pico-uart", "arm,pl011";
266 reg = <0x40034000 DT_SIZE_K(4)>;
267 clocks = <&clocks RPI_PICO_CLKID_CLK_PERI>;
268 resets = <&reset RPI_PICO_RESETS_RESET_UART0>;
269 interrupts = <20 RPI_PICO_DEFAULT_IRQ_PRIORITY>;
270 interrupt-names = "uart0";
271 status = "disabled";
272 };
では、少し戻って pin の組み合わせである pinctrl-0 に代入した uart0_default も確認してみます。
zephyr/boards/raspberrypi/common/rpi_pico-pinctrl-common.dtsi
7 &pinctrl {
8 uart0_default: uart0_default {
9 group1 {
10 pinmux = <UART0_TX_P0>;
11 };
12 group2 {
13 pinmux = <UART0_RX_P1>;
14 input-enable;
15 };
16 };
group1 には UART0_TX が割り当てられている P0 を、
group2 には UART0_RX が割り当てられている P1 を割り当てつつ、RX なため入力として設定されていることが読み取れます。
5. まとめ
本記事では、dts を構成するファイルの一つ、dtsi を読み解きながら、dts のフォーマットにも軽く触れてみました。
これだけでもある程度読み書きできるようになるとは思いますが、実際にパラメータを設定するにあたって、左辺値と右辺値はどのようなキーワードを入れるべきなのか、利用できるのかという選択肢を把握しない事には先に進まないケースが多分にあります。
其の弐、其の参ではそれら左辺値・右辺値について触れていく予定です。