mfd: add Airoha AN8855 switch support

new file mode 100644
index 000000000000..48127e956c96
@@ -0,0 +1,176 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mfd/airoha,an8855.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Airoha AN8855 Switch SoC
+
+maintainers:
+  - Christian Marangi <[email protected]>
+
+description: >
+  Airoha AN8855 Switch is a SoC that expose various peripherals like an
+  Ethernet Switch, a NVMEM provider and Ethernet PHYs.
+
+  It does also support i2c and timers but those are not currently
+  supported/used.
+
+properties:
+  compatible:
+    const: airoha,an8855
+
+  reg:
+    maxItems: 1
+
+  reset-gpios:
+    maxItems: 1
+
+  efuse:
+    type: object
+    $ref: /schemas/nvmem/airoha,an8855-efuse.yaml
+    description: EFUSE exposed by the Airoha AN8855 SoC
+
+  ethernet-switch:
+    type: object
+    $ref: /schemas/net/dsa/airoha,an8855-switch.yaml
+    description: Switch exposed by the Airoha AN8855 SoC
+
+  mdio:
+    type: object
+    $ref: /schemas/net/mdio.yaml#
+    description: MDIO exposed by the Airoha AN8855 SoC
+    unevaluatedProperties: false
+
+required:
+  - compatible
+  - reg
+  - mdio
+  - ethernet-switch
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    mdio {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        soc@1 {
+            compatible = "airoha,an8855";
+            reg = <1>;
+
+            reset-gpios = <&pio 39 GPIO_ACTIVE_HIGH>;
+
+            efuse {
+                compatible = "airoha,an8855-efuse";
+
+                #nvmem-cell-cells = <0>;
+
+                nvmem-layout {
+                    compatible = "fixed-layout";
+                    #address-cells = <1>;
+                    #size-cells = <1>;
+
+                    shift_sel_port0_tx_a: shift-sel-port0-tx-a@c {
+                       reg = <0xc 0x4>;
+                    };
+
+                    shift_sel_port0_tx_b: shift-sel-port0-tx-b@10 {
+                        reg = <0x10 0x4>;
+                    };
+
+                    shift_sel_port0_tx_c: shift-sel-port0-tx-c@14 {
+                        reg = <0x14 0x4>;
+                    };
+
+                    shift_sel_port0_tx_d: shift-sel-port0-tx-d@18 {
+                       reg = <0x18 0x4>;
+                    };
+
+                    shift_sel_port1_tx_a: shift-sel-port1-tx-a@1c {
+                        reg = <0x1c 0x4>;
+                    };
+
+                    shift_sel_port1_tx_b: shift-sel-port1-tx-b@20 {
+                        reg = <0x20 0x4>;
+                    };
+
+                    shift_sel_port1_tx_c: shift-sel-port1-tx-c@24 {
+                       reg = <0x24 0x4>;
+                    };
+
+                    shift_sel_port1_tx_d: shift-sel-port1-tx-d@28 {
+                        reg = <0x28 0x4>;
+                    };
+                };
+            };
+
+            ethernet-switch {
+                compatible = "airoha,an8855-switch";
+
+                ports {
+                    #address-cells = <1>;
+                    #size-cells = <0>;
+
+                    port@0 {
+                        reg = <0>;
+                        label = "lan1";
+                        phy-mode = "internal";
+                        phy-handle = <&internal_phy1>;
+                    };
+
+                    port@1 {
+                        reg = <1>;
+                        label = "lan2";
+                        phy-mode = "internal";
+                        phy-handle = <&internal_phy2>;
+                    };
+
+                    port@5 {
+                        reg = <5>;
+                        label = "cpu";
+                        ethernet = <&gmac0>;
+                        phy-mode = "2500base-x";
+
+                        fixed-link {
+                            speed = <2500>;
+                            full-duplex;
+                            pause;
+                        };
+                    };
+                };
+            };
+
+            mdio {
+                #address-cells = <1>;
+                #size-cells = <0>;
+
+                internal_phy1: ethernet-phy@1 {
+                  compatible = "ethernet-phy-idc0ff.0410",
+                               "ethernet-phy-ieee802.3-c22";
+                  reg = <1>;
+
+                  nvmem-cells = <&shift_sel_port0_tx_a>,
+                      <&shift_sel_port0_tx_b>,
+                      <&shift_sel_port0_tx_c>,
+                      <&shift_sel_port0_tx_d>;
+                  nvmem-cell-names = "tx_a", "tx_b", "tx_c", "tx_d";
+                };
+
+                internal_phy2: ethernet-phy@2 {
+                  compatible = "ethernet-phy-idc0ff.0410",
+                               "ethernet-phy-ieee802.3-c22";
+                  reg = <2>;
+
+                  nvmem-cells = <&shift_sel_port1_tx_a>,
+                      <&shift_sel_port1_tx_b>,
+                      <&shift_sel_port1_tx_c>,
+                      <&shift_sel_port1_tx_d>;
+                  nvmem-cell-names = "tx_a", "tx_b", "tx_c", "tx_d";
+                };
+            };
+        };
+    };

index 87ed55c155f0..653a81435b20 100644
@@ -54,6 +54,20 @@ config MFD_ALTERA_SYSMGR
 	  using regmap_mmio accesses for ARM32 parts and SMC calls to
 	  EL3 for ARM64 parts.
 
+config MFD_AIROHA_AN8855
+	tristate "Airoha AN8855 Switch Core"
+	select MFD_CORE
+	select REGMAP
+	select PHYLIB
+	select MDIO_REGMAP
+	depends on NETDEVICES && OF
+	help
+	  Support for the Airoha AN8855 Switch Core. This is an SoC
+	  that provides various peripherals, to count, i2c, an Ethrnet
+	  Switch, a CPU timer, GPIO, eFUSE.
+
+	  Currently it provides a DSA switch and a NVMEM provider.
+
 config MFD_ACT8945A
 	tristate "Active-semi ACT8945A"
 	select MFD_CORE

index f8101d2a9ce9..96bbe3fad736 100644
@@ -8,6 +8,7 @@ obj-$(CONFIG_MFD_88PM860X)	+= 88pm860x.o
 obj-$(CONFIG_MFD_88PM800)	+= 88pm800.o 88pm80x.o
 obj-$(CONFIG_MFD_88PM805)	+= 88pm805.o 88pm80x.o
 obj-$(CONFIG_MFD_88PM886_PMIC)	+= 88pm886.o
+obj-$(CONFIG_MFD_AIROHA_AN8855)	+= airoha-an8855.o
 obj-$(CONFIG_MFD_ACT8945A)	+= act8945a.o
 obj-$(CONFIG_MFD_SM501)		+= sm501.o
 obj-$(CONFIG_ARCH_BCM2835)	+= bcm2835-pm.o