diff --git a/Documentation/devicetree/bindings/hwmon/aspeed,ast2600-tach.yaml b/Documentation/devicetree/bindings/hwmon/aspeed,ast2600-tach.yaml
new file mode 100644
index 000000000000..838200fae30e
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+++ b/Documentation/devicetree/bindings/hwmon/aspeed,ast2600-tach.yaml
@@ -0,0 +1,48 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+# Copyright (C) 2021 Aspeed, Inc.
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/hwmon/aspeed,ast2600-tach.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Aspeed Ast2600 Tach controller
+
+maintainers:
+  - Billy Tsai <billy_tsai@aspeedtech.com>
+
+description: |
+  The Aspeed Tach controller can support upto 16 fan input.
+  This module is part of the ast2600-pwm-tach multi-function device. For more
+  details see ../mfd/aspeed,ast2600-pwm-tach.yaml.
+
+properties:
+  compatible:
+    enum:
+      - aspeed,ast2600-tach
+
+  "#address-cells":
+    const: 1
+
+  "#size-cells":
+    const: 0
+
+  pinctrl-0: true
+
+  pinctrl-names:
+    const: default
+
+required:
+  - compatible
+  - "#address-cells"
+  - "#size-cells"
+
+additionalProperties:
+  type: object
+  properties:
+    reg:
+      description:
+        The tach channel used for this node.
+      maxItems: 1
+
+  required:
+    - reg
diff --git a/Documentation/devicetree/bindings/mfd/aspeed,ast2600-pwm-tach.yaml b/Documentation/devicetree/bindings/mfd/aspeed,ast2600-pwm-tach.yaml
new file mode 100644
index 000000000000..1eaf6fab2752
--- /dev/null
+++ b/Documentation/devicetree/bindings/mfd/aspeed,ast2600-pwm-tach.yaml
@@ -0,0 +1,76 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+# Copyright (C) 2021 Aspeed, Inc.
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mfd/aspeed,ast2600-pwm-tach.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: PWM Tach controller Device Tree Bindings
+
+description: |
+  The PWM Tach controller is represented as a multi-function device which
+  includes:
+    PWM
+    Tach
+
+maintainers:
+  - Billy Tsai <billy_tsai@aspeedtech.com>
+
+properties:
+  compatible:
+    items:
+      - enum:
+          - aspeed,ast2600-pwm-tach
+      - const: syscon
+      - const: simple-mfd
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  resets:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - resets
+
+patternProperties:
+  "^pwm(@[0-9a-f]+)?$":
+    $ref: ../pwm/aspeed,ast2600-pwm.yaml
+
+  "^tach(@[0-9a-f]+)?$":
+    $ref: ../hwmon/aspeed,ast2600-tach.yaml
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/ast2600-clock.h>
+    pwm_tach: pwm_tach@1e610000 {
+      compatible = "aspeed,ast2600-pwm-tach", "syscon", "simple-mfd";
+      reg = <0x1e610000 0x100>;
+      clocks = <&syscon ASPEED_CLK_AHB>;
+      resets = <&syscon ASPEED_RESET_PWM>;
+
+      pwm: pwm {
+        compatible = "aspeed,ast2600-pwm";
+        #address-cells = <1>;
+        #size-cells = <0>;
+        #pwm-cells = <3>;
+        pinctrl-names = "default";
+        pinctrl-0 = <&pinctrl_pwm0_default>;
+      };
+
+      tach: tach {
+        compatible = "aspeed,ast2600-tach";
+        #address-cells = <1>;
+        #size-cells = <0>;
+        pinctrl-names = "default";
+        pinctrl-0 = <&pinctrl_tach0_default>;
+      };
+    };
diff --git a/Documentation/devicetree/bindings/pwm/aspeed,ast2600-pwm.yaml b/Documentation/devicetree/bindings/pwm/aspeed,ast2600-pwm.yaml
new file mode 100644
index 000000000000..f501f8a769df
--- /dev/null
+++ b/Documentation/devicetree/bindings/pwm/aspeed,ast2600-pwm.yaml
@@ -0,0 +1,64 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+# Copyright (C) 2021 Aspeed, Inc.
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pwm/aspeed,ast2600-pwm.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Aspeed Ast2600 PWM controller
+
+maintainers:
+  - Billy Tsai <billy_tsai@aspeedtech.com>
+
+description: |
+  The Aspeed PWM controller can support upto 16 PWM outputs.
+  This module is part of the ast2600-pwm-tach multi-function device. For more
+  details see ../mfd/aspeed,ast2600-pwm-tach.yaml.
+
+properties:
+  compatible:
+    enum:
+      - aspeed,ast2600-pwm
+
+  "#pwm-cells":
+    const: 3
+
+  "#address-cells":
+    const: 1
+
+  "#size-cells":
+    const: 0
+
+  pinctrl-0: true
+
+  pinctrl-names:
+    const: default
+
+required:
+  - compatible
+  - "#pwm-cells"
+  - "#address-cells"
+  - "#size-cells"
+
+additionalProperties:
+  description: Set extend properties for each pwm channel.
+  type: object
+  properties:
+    reg:
+      description:
+        The pwm channel index.
+      maxItems: 1
+
+    aspeed,wdt-reload-enable:
+      type: boolean
+      description:
+        Enable the function of wdt reset reload duty point.
+
+    aspeed,wdt-reload-duty-point:
+      description:
+        Define the duty point after wdt reset, 0 = 100%
+      minimum: 0
+      maximum: 255
+
+  required:
+    - reg
