[openwrt/openwrt] realtek: rtl839x: Enable AUX MDIO controller

[LEDE Commits]

svanheule pushed a commit to openwrt/openwrt.git, branch main:
https://git.openwrt.org/cddcc69ddf9c6284d6c9a6399c4ea48d7a044719

commit cddcc69ddf9c6284d6c9a6399c4ea48d7a044719
Author: Sander Vanheule <sander at svanheule.net>
AuthorDate: Sat Jan 18 13:45:55 2025 +0100

    realtek: rtl839x: Enable AUX MDIO controller
    
    Enable the driver for the Realtek Otto auxiliary MDIO driver so RTL839x
    devices can use it. The related node is added to the base devicetree for
    rtl839x-based devices, so they can enabled and use it when required.
    
    Signed-off-by: Sander Vanheule <sander at svanheule.net>
---
 target/linux/realtek/dts/rtl839x.dtsi   | 21 +++++++++++++++++++++
 target/linux/realtek/rtl839x/config-6.6 |  2 +-
 2 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/target/linux/realtek/dts/rtl839x.dtsi b/target/linux/realtek/dts/rtl839x.dtsi
index 3f87f5622e..7fc5aea70c 100644
--- a/target/linux/realtek/dts/rtl839x.dtsi
+++ b/target/linux/realtek/dts/rtl839x.dtsi
@@ -258,6 +258,22 @@
 
 	};
 
+	switchcore at 1b000000 {
+		compatible = "syscon", "simple-mfd";
+		reg = <0x1b000000 0x20000>;
+
+		mdio_aux: mdio-aux {
+			compatible = "realtek,rtl8390-aux-mdio";
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			status = "disabled";
+
+			pinctrl-names = "default";
+			pinctrl-0 = <&mdio_aux_mdx>;
+		};
+	};
+
 	pinmux at 1b000004 {
 		compatible = "pinctrl-single";
 		reg = <0x1b000004 0x4>;
@@ -290,6 +306,11 @@
 		pinmux_disable_sys_led: disable_sys_led {
 			pinctrl-single,bits = <0x0 0x0 0x4000>;
 		};
+
+		/* enable AUX MDC/MDIO */
+		mdio_aux_mdx: aux-mdx-pins {
+			pinctrl-single,bits = <0x0 0x100000 0x1c0000>;
+		};
 	};
 
 	ethernet0: ethernet at 1b00a300 {
diff --git a/target/linux/realtek/rtl839x/config-6.6 b/target/linux/realtek/rtl839x/config-6.6
index 2616286a17..dac7646925 100644
--- a/target/linux/realtek/rtl839x/config-6.6
+++ b/target/linux/realtek/rtl839x/config-6.6
@@ -130,7 +130,7 @@ CONFIG_MDIO_BUS=y
 CONFIG_MDIO_DEVICE=y
 CONFIG_MDIO_DEVRES=y
 CONFIG_MDIO_I2C=y
-# CONFIG_MDIO_REALTEK_OTTO_AUX is not set
+CONFIG_MDIO_REALTEK_OTTO_AUX=y
 CONFIG_MDIO_SMBUS=y
 # CONFIG_MFD_RTL8231 is not set
 CONFIG_MFD_SYSCON=y