From 87723b5ab887b79b0e9ce597ba098d92b1eba157 Mon Sep 17 00:00:00 2001
From: Dmitry Ilyin <6576495+widgetii@users.noreply.github.com>
Date: Mon, 19 Oct 2026 21:41:50 +0300
Subject: [PATCH] arm: dts: hi3516a: enable uart1-3 so boards can mux them for
 PTZ

Only uart0 was enabled, so a board whose PTZ controller hangs off another
UART had no tty to talk to, whatever it did with the pads. That is
OpenIPC/firmware#2385: a HI3516D_N81820 speed dome whose pan/tilt MCU is
driven over Pelco-D from the main board, where the stock firmware muxes
UART1 (IOCONFIG 0x200F007C/0x200F0084 = 1) and keeps the UART1_RTSN ball
as GPIO9_2 for what looks like an RS-485 direction pin.

Enable uart1, uart2 and uart3 and give them serial1..3 aliases, so
ttyAMA1..3 name the same controller whatever the probe order. The pads
are left alone: every one of them resets to GPIO (datasheet table 2-48,
muxctrl_reg30..35), so a board that does not mux them sees no change on
the wire and only gains three tty nodes. Muxing is per board and stays
with the board.
---
 arch/arm/boot/dts/hi3516a-demb.dts | 12 ++++++++++++
 arch/arm/boot/dts/hi3516a.dtsi     |  3 +++
 2 files changed, 15 insertions(+)

diff --git a/arch/arm/boot/dts/hi3516a-demb.dts b/arch/arm/boot/dts/hi3516a-demb.dts
index 7a0d6103518..79a702d0306 100644
--- a/arch/arm/boot/dts/hi3516a-demb.dts
+++ b/arch/arm/boot/dts/hi3516a-demb.dts
@@ -87,6 +87,18 @@
 	status = "okay";
 };
 
+&uart1 {
+	status = "okay";
+};
+
+&uart2 {
+	status = "okay";
+};
+
+&uart3 {
+	status = "okay";
+};
+
 &dual_timer0 {
 	status = "okay";
 };
diff --git a/arch/arm/boot/dts/hi3516a.dtsi b/arch/arm/boot/dts/hi3516a.dtsi
index f8ecb0ec4c5..ba29813f29d 100644
--- a/arch/arm/boot/dts/hi3516a.dtsi
+++ b/arch/arm/boot/dts/hi3516a.dtsi
@@ -23,6 +23,9 @@
 / {
 	aliases {
 		serial0 = &uart0;
+		serial1 = &uart1;
+		serial2 = &uart2;
+		serial3 = &uart3;
 		i2c0 = &i2c_bus0;
 		i2c1 = &i2c_bus1;
 		i2c2 = &i2c_bus2;