From 70409005dd46a805a45e1d128c6a2d2eecebfcb2 Mon Sep 17 00:00:00 2001
From: Philipp Dargel <chisui@users.noreply.github.com>
Date: Wed, 17 Nov 2021 07:34:41 +0100
Subject: [PATCH] microsoft/surface: add serial dev bus config

---
 microsoft/surface/kernel/linux-5.13.4/default.nix | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/microsoft/surface/kernel/linux-5.13.4/default.nix b/microsoft/surface/kernel/linux-5.13.4/default.nix
index 7aa0152..fe2b728 100644
--- a/microsoft/surface/kernel/linux-5.13.4/default.nix
+++ b/microsoft/surface/kernel/linux-5.13.4/default.nix
@@ -25,6 +25,12 @@ let
 
         BATTERY_SURFACE = module;
         CHARGER_SURFACE = module;
+        
+        #
+        # Surface laptop 1 keyboard
+        #
+        SERIAL_DEV_BUS = yes;
+        SERIAL_DEV_CTRL_TTYPORT = yes;
 
         #
         # Surface Hotplug