[PATCH 1/3] dt-bindings: Add bindings for aspeed pwm-tach.

[Billy Tsai <billy_tsai@aspeedtech.com>]

Unlike the old design that the register setting of the TACH should based
on the configure of the PWM. In ast26xx, the dependency between pwm and
tach controller is eliminated and becomes a separate hardware block. They
only shared the same base address, source clock and reset.
This patch adds device binding for aspeed pwm-tach device which is a
multi-function device include pwm and tach function and pwm/tach device
bindings which should be the child-node of pwm-tach device.

Signed-off-by: Billy Tsai <billy_tsai@aspeedtech.com>
---
 .../bindings/hwmon/aspeed,ast2600-tach.yaml   | 48 ++++++++++++
 .../bindings/mfd/aspeed,ast2600-pwm-tach.yaml | 76 +++++++++++++++++++
 .../bindings/pwm/aspeed,ast2600-pwm.yaml      | 64 ++++++++++++++++
 3 files changed, 188 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/hwmon/aspeed,ast2600-tach.yaml
 create mode 100644 Documentation/devicetree/bindings/mfd/aspeed,ast2600-pwm-tach.yaml
 create mode 100644 Documentation/devicetree/bindings/pwm/aspeed,ast2600-pwm.yaml

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
--- /dev/null
+++ 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
-- 
2.25.1