From ce342ee8d3291932ba6173155b95b4596013460e Mon Sep 17 00:00:00 2001
From: Sander Vanheule <sander@svanheule.net>
Date: Thu, 19 Feb 2026 16:13:06 +0100
Subject: [PATCH] realtek: rtl839x: support GS1900-48 A1 port LEDs

Add the RTL8231 controlling the port LEDs to the devicetree, so users
can enable them. Using the appropriate link name, the netdev trigger can
be used to reflect the port status. As no hardware port status
offloading is supported, blinking on traffic could result in increased
load due to the numerous LED updates.

Signed-off-by: Sander Vanheule <sander@svanheule.net>
---
 .../dts/rtl8393_zyxel_gs1900-48-a1.dts        | 95 ++++++++++++++++++-
 1 file changed, 94 insertions(+), 1 deletion(-)

diff --git a/target/linux/realtek/dts/rtl8393_zyxel_gs1900-48-a1.dts b/target/linux/realtek/dts/rtl8393_zyxel_gs1900-48-a1.dts
index 20e55c4338..e23402b4d9 100644
--- a/target/linux/realtek/dts/rtl8393_zyxel_gs1900-48-a1.dts
+++ b/target/linux/realtek/dts/rtl8393_zyxel_gs1900-48-a1.dts
@@ -2,8 +2,9 @@
 
 #include "rtl839x.dtsi"
 
-#include <dt-bindings/input/input.h>
 #include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+#include <dt-bindings/leds/common.h>
 
 / {
 	compatible = "zyxel,gs1900-48-a1", "realtek,rtl8393-soc";
@@ -83,9 +84,101 @@
 	};
 };
 
+#define PORT_LED(lan, p, l) \
+	led@p,l { \
+		reg = <p l>; \
+		color = <LED_COLOR_ID_GREEN>; \
+		function = LED_FUNCTION_LAN; \
+		function-enumerator = <lan>; \
+	}
+
 &mdio_aux {
 	status = "okay";
 
+	pinctrl-names = "default";
+	pinctrl-0 = <&port_led_offload>;
+
+	port_leds: expander@0 {
+		compatible = "realtek,rtl8231";
+		reg = <0>;
+
+		gpio-controller;
+		#gpio-cells = <2>;
+		gpio-ranges = <&port_leds 0 0 37>;
+
+		led_matrix: led-scan-single {
+			pins = "gpio0", "gpio1", "gpio2", "gpio3", "gpio4", "gpio5",
+			       "gpio6", "gpio7", "gpio8", "gpio9", "gpio10", "gpio11",
+			       "gpio12", "gpio13", "gpio14", "gpio15", "gpio16", "gpio17",
+			       "gpio18", "gpio19";
+			function = "led";
+		};
+
+		led-controller {
+			compatible = "realtek,rtl8231-leds";
+			#address-cells = <2>;
+			#size-cells = <0>;
+
+			pinctrl-names = "default";
+			pinctrl-0 = <&led_matrix>;
+
+			realtek,led-scan-mode = "single-color";
+
+			// RJ45 ports
+			PORT_LED(1, 0, 0);
+			PORT_LED(2, 0, 1);
+			PORT_LED(3, 0, 2);
+			PORT_LED(4, 1, 0);
+			PORT_LED(5, 1, 1);
+			PORT_LED(6, 1, 2);
+			PORT_LED(7, 2, 0);
+			PORT_LED(8, 2, 1);
+			PORT_LED(9, 2, 2);
+			PORT_LED(10, 3, 0);
+			PORT_LED(11, 3, 1);
+			PORT_LED(12, 3, 2);
+			PORT_LED(13, 4, 0);
+			PORT_LED(14, 4, 1);
+			PORT_LED(15, 4, 2);
+			PORT_LED(16, 5, 0);
+			PORT_LED(17, 5, 1);
+			PORT_LED(18, 5, 2);
+			PORT_LED(19, 6, 0);
+			PORT_LED(20, 6, 1);
+			PORT_LED(21, 6, 2);
+			PORT_LED(22, 7, 0);
+			PORT_LED(23, 7, 1);
+			PORT_LED(24, 7, 2);
+			PORT_LED(25, 8, 0);
+			PORT_LED(26, 8, 1);
+			PORT_LED(27, 8, 2);
+			PORT_LED(28, 9, 0);
+			PORT_LED(29, 9, 1);
+			PORT_LED(30, 9, 2);
+			PORT_LED(31, 10, 0);
+			PORT_LED(32, 10, 1);
+			PORT_LED(33, 10, 2);
+			PORT_LED(34, 11, 0);
+			PORT_LED(35, 11, 1);
+			PORT_LED(36, 11, 2);
+			PORT_LED(37, 12, 0);
+			PORT_LED(38, 12, 1);
+			PORT_LED(39, 12, 2);
+			PORT_LED(40, 13, 0);
+			PORT_LED(41, 13, 1);
+			PORT_LED(42, 13, 2);
+			PORT_LED(43, 14, 0);
+			PORT_LED(44, 14, 1);
+			PORT_LED(45, 14, 2);
+			PORT_LED(46, 15, 0);
+			PORT_LED(47, 15, 1);
+			PORT_LED(48, 15, 2);
+			// SFP ports
+			PORT_LED(49, 16, 0);
+			PORT_LED(50, 16, 1);
+		};
+	};
+
 	gpio1: expander@3 {
 		compatible = "realtek,rtl8231";
 		reg = <3>;