From 18c0cbb6b49d7b4402c9eb9fd0690e4bd3d31b63 Mon Sep 17 00:00:00 2001
From: Michael Eden <themichaeleden@gmail.com>
Date: Fri, 7 Oct 2022 10:59:54 -0400
Subject: [PATCH] raspberrypi/4: allow pi libs to detect pi 4

---
 raspberry-pi/4/cpu-revision.nix | 25 +++++++++++++++++++++++++
 raspberry-pi/4/default.nix      |  1 +
 2 files changed, 26 insertions(+)
 create mode 100644 raspberry-pi/4/cpu-revision.nix

diff --git a/raspberry-pi/4/cpu-revision.nix b/raspberry-pi/4/cpu-revision.nix
new file mode 100644
index 0000000..8ac2c55
--- /dev/null
+++ b/raspberry-pi/4/cpu-revision.nix
@@ -0,0 +1,25 @@
+{ ... }:
+{
+  hardware.deviceTree.overlays = [
+    {
+      name = "rpi4-cpu-revision";
+      dtsText = ''
+        /dts-v1/;
+        /plugin/;
+
+        / {
+          compatible = "raspberrypi,4-model-b";
+
+          fragment@0 {
+            target-path = "/";
+            __overlay__ {
+              system {
+                linux,revision = <0x00d03114>;
+              };
+            };
+          };
+        };
+      '';
+    }
+  ];
+}
diff --git a/raspberry-pi/4/default.nix b/raspberry-pi/4/default.nix
index d85063a..13cf417 100644
--- a/raspberry-pi/4/default.nix
+++ b/raspberry-pi/4/default.nix
@@ -3,6 +3,7 @@
 {
   imports = [
     ./audio.nix
+    ./cpu-revision.nix
     ./dwc2.nix
     ./i2c.nix
     ./modesetting.nix