From 173d0fb61672ab51fad30b62c2a1be3c6cc100be Mon Sep 17 00:00:00 2001
From: Andriy Gapon <avg@FreeBSD.org>
Date: Tue, 18 Jan 2022 09:26:14 +0200
Subject: [PATCH] add overlay for enabling serial1 / uart1 on rk3328

On Rock64 the uart is routed to pins on the "Pi-2" header, so it is
potentially useful.

Pin mapping:
----------------------------
| ID | Name     | Function |
----------------------------
| 15 | GPIO3_A4 | TX       |
| 16 | GPIO3_A5 | RTS      |
| 18 | GPIO3_A6 | RX       |
| 22 | GPIO3_A7 | CTS      |
----------------------------

MFC after:	2 weeks
---
 sys/dts/arm64/overlays/rk3328-uart1.dtso | 12 ++++++++++++
 sys/modules/dtb/rockchip/Makefile        |  1 +
 2 files changed, 13 insertions(+)
 create mode 100644 sys/dts/arm64/overlays/rk3328-uart1.dtso

diff --git a/sys/dts/arm64/overlays/rk3328-uart1.dtso b/sys/dts/arm64/overlays/rk3328-uart1.dtso
new file mode 100644
index 00000000000..96ae37e363f
--- /dev/null
+++ b/sys/dts/arm64/overlays/rk3328-uart1.dtso
@@ -0,0 +1,12 @@
+/dts-v1/;
+/plugin/;
+
+/ {
+	compatible = "rockchip,rk3328";
+};
+
+&{/serial@ff120000} {
+	status = "okay";
+};
+
+/* vim: set ft=dts: */
diff --git a/sys/modules/dtb/rockchip/Makefile b/sys/modules/dtb/rockchip/Makefile
index b0d3b977a34..1e0c6a2d436 100644
--- a/sys/modules/dtb/rockchip/Makefile
+++ b/sys/modules/dtb/rockchip/Makefile
@@ -21,6 +21,7 @@ DTS=	\
 
 DTSO=	rk3328-analog-sound.dtso \
 	rk3328-i2c0.dtso \
+	rk3328-uart1.dtso \
 	rk3328-dwc3.dtso \
 	rk3399-mmc0-disable.dtso \
 	rk3399-mmc1-disable.dtso \