From 2ff3648e8fc334643a2a30483c07b0332f964082 Mon Sep 17 00:00:00 2001
From: Ciro Santilli <ciro.santilli@gmail.com>
Date: Sat, 8 Jul 2017 00:38:01 +0100
Subject: [PATCH] device tree info

---
 README.md      |  1 +
 device-tree.md | 41 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 42 insertions(+)
 create mode 100644 device-tree.md

diff --git a/README.md b/README.md
index d6c4cd7..010f4bc 100644
--- a/README.md
+++ b/README.md
@@ -376,6 +376,7 @@ You can still send key presses to QEMU however even without the mouse capture, j
 1.  [kmod](kmod.md)
 1.  [vermagic](vermagic.md)
 1.  [ftrace](ftrace.md)
+1.  [Device tree](device-tree.md)
 1.  [Bibliography](bibliography.md)
 1.  Examples
     1.  [Host](host/)
diff --git a/device-tree.md b/device-tree.md
new file mode 100644
index 0000000..396c139
--- /dev/null
+++ b/device-tree.md
@@ -0,0 +1,41 @@
+# Device tree
+
+`platform_device.c` together with its kernel and QEMU forks contains a minimal runnable example.
+
+Good format descriptions:
+
+- <https://www.raspberrypi.org/documentation/configuration/device-tree.md>
+
+Minimal example
+
+    /dts-v1/;
+
+    / {
+        a;
+    };
+
+Check correctness with:
+
+    dtc a.dts
+
+Separate nodes are simply merged by node path, e.g.:
+
+    /dts-v1/;
+
+    / {
+        a;
+    };
+
+    / {
+        b;
+    };
+
+then `dtc a.dts` gives:
+
+
+    /dts-v1/;
+
+    / {
+            a;
+            b;
+    };