capture the .dts source for my dtb, and start a Notebook file with ToDo list

diff --git a/Notebook b/Notebook
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+++ b/Notebook
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+Stuff that needs to be done to this package before I consider it "complete"
+
+- the bcm2837-rpi-zero-2-w.dtb file here was created by editing the relevant
+  dts file in the kernel source tree and running 'make dtbs'.  To do this
+  "right", I need to build depend on the kernel source package and devicetree
+  compiler, and then figure out how to drive the compiler out of tree with
+  my dts using the kernel source tree to obtain required .dtsi include files.
+

diff --git a/bcm2837-rpi-zero-2-w.dts b/bcm2837-rpi-zero-2-w.dts
new file mode 100644 (file)
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+++ b/bcm2837-rpi-zero-2-w.dts
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+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2022 Stefan Wahren <stefan.wahren@i2se.com>
+ */
+
+/dts-v1/;
+#include "bcm2837.dtsi"
+#include "bcm2836-rpi.dtsi"
+#include "bcm283x-rpi-usb-otg.dtsi"
+#include "bcm283x-rpi-wifi-bt.dtsi"
+
+/ {
+       compatible = "raspberrypi,model-zero-2-w", "brcm,bcm2837";
+       model = "Raspberry Pi Zero 2 W";
+
+       memory@0 {
+               device_type = "memory";
+               reg = <0 0x20000000>;
+       };
+
+       chosen {
+               /* 8250 auxiliary UART instead of pl011 */
+               stdout-path = "serial1:115200n8";
+       };
+
+       leds {
+               led-act {
+                       gpios = <&gpio 29 GPIO_ACTIVE_LOW>;
+               };
+       };
+};
+
+&bt {
+       shutdown-gpios = <&gpio 42 GPIO_ACTIVE_HIGH>;
+};
+
+&gpio {
+       /*
+        * This is based on the official GPU firmware DT blob.
+        *
+        * Legend:
+        * "NC" = not connected (no rail from the SoC)
+        * "FOO" = GPIO line named "FOO" on the schematic
+        * "FOO_N" = GPIO line named "FOO" on schematic, active low
+        */
+       gpio-line-names = "ID_SDA",
+                         "ID_SCL",
+                         "SDA1",
+                         "SCL1",
+                         "GPIO_GCLK",
+                         "GPIO5",
+                         "GPIO6",
+                         "SPI_CE1_N",
+                         "SPI_CE0_N",
+                         "SPI_MISO",
+                         "SPI_MOSI",
+                         "SPI_SCLK",
+                         "GPIO12",
+                         "GPIO13",
+                         /* Serial port */
+                         "TXD0",
+                         "RXD0",
+                         "GPIO16",
+                         "GPIO17",
+                         "GPIO18",
+                         "GPIO19",
+                         "GPIO20",
+                         "GPIO21",
+                         "GPIO22",
+                         "GPIO23",
+                         "GPIO24",
+                         "GPIO25",
+                         "GPIO26",
+                         "GPIO27",
+                         "HDMI_HPD_N",
+                         "STATUS_LED_N",
+                         "NC", /* GPIO30 */
+                         "NC", /* GPIO31 */
+                         "NC", /* GPIO32 */
+                         "NC", /* GPIO33 */
+                         "NC", /* GPIO34 */
+                         "NC", /* GPIO35 */
+                         "NC", /* GPIO36 */
+                         "NC", /* GPIO37 */
+                         "NC", /* GPIO38 */
+                         "NC", /* GPIO39 */
+                         "CAM_GPIO0", /* GPIO40 */
+                         "WL_ON", /* GPIO41 */
+                         "BT_ON", /* GPIO42 */
+                         "WIFI_CLK", /* GPIO43 */
+                         "SDA0", /* GPIO44 */
+                         "SCL0", /* GPIO45 */
+                         "SMPS_SCL",
+                         "SMPS_SDA",
+                         /* Used by SD Card */
+                         "SD_CLK_R",
+                         "SD_CMD_R",
+                         "SD_DATA0_R",
+                         "SD_DATA1_R",
+                         "SD_DATA2_R",
+                         "SD_DATA3_R";
+
+       pinctrl-0 = <&gpioout &alt0>;
+};
+
+&hdmi {
+       hpd-gpios = <&gpio 28 GPIO_ACTIVE_LOW>;
+       power-domains = <&power RPI_POWER_DOMAIN_HDMI>;
+       status = "okay";
+};
+
+&sdhci {
+       pinctrl-0 = <&emmc_gpio34 &gpclk2_gpio43>;
+};
+
+&sdhost {
+       pinctrl-names = "default";
+       pinctrl-0 = <&sdhost_gpio48>;
+       bus-width = <4>;
+       status = "okay";
+};
+
+&uart0 {
+       pinctrl-names = "default";
+       pinctrl-0 = <&uart0_gpio32 &uart0_ctsrts_gpio30>;
+};
+
+&uart1 {
+       pinctrl-names = "default";
+       pinctrl-0 = <&uart1_gpio14>;
+       status = "okay";
+};
+
+&wifi_pwrseq {
+       reset-gpios = <&gpio 41 GPIO_ACTIVE_LOW>;
+};
+
+&spi {
+       status = "okay";
+
+       pinctrl-names = "default";
+       cs-gpios = <&gpio 8 GPIO_ACTIVE_LOW>, <&gpio 7 GPIO_ACTIVE_LOW>;
+
+       #address-cells = <1>;
+       #size-cells = <0>;
+
+       ads8688: ads8688@0 {
+               compatible = "ti,ads8688";
+               reg = <0>;
+               spi-max-frequency = <1000000>;
+       };
+};