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

[Krzysztof Kozlowski <krzk@kernel.org>]

On 31/10/2022 06:38, Billy Tsai wrote:
> Unlike the old design that the register setting of the TACH should based

Drop full stop in subject. Drop redundant, second "bindings" in subject.

> 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

Do not use "This commit/patch".
https://elixir.bootlin.com/linux/v5.17.1/source/Documentation/process/submitting-patches.rst#L95

> bindings which should be the child-node of pwm-tach device.

Please use scripts/get_maintainers.pl to get a list of necessary people
and lists to CC.  It might happen, that command when run on an older
kernel, gives you outdated entries.  Therefore please be sure you base
your patches on recent Linux kernel.

> 
> 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 ++++++++++++++++

Split per subsystem. And Cc necessary people...

>  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

These should not be needed.

> +
> +required:
> +  - compatible
> +  - "#address-cells"
> +  - "#size-cells"
> +
> +additionalProperties:

Instead patternProperties and put them above "required:"

> +  type: object
> +  properties:
> +    reg:
> +      description:
> +        The tach channel used for this node.
> +      maxItems: 1
> +
> +  required:
> +    - reg

additionalProperties on this level of indentation.

> 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

Drop "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

Full path, so: /schemas/pwm/aspeed,ast2600-pwm.yaml

Why unit addresses are optional?

> +
> +  "^tach(@[0-9a-f]+)?$":
> +    $ref: ../hwmon/aspeed,ast2600-tach.yaml

Ditto

Why unit addresses are optional?

> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/ast2600-clock.h>
> +    pwm_tach: pwm_tach@1e610000 {

Node names should be generic.
https://devicetree-specification.readthedocs.io/en/latest/chapter2-devicetree-basics.html#generic-names-recommendation

No underscores in node names.

> +      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>;

No need for address/size cells. No children.

> +        #pwm-cells = <3>;
> +        pinctrl-names = "default";
> +        pinctrl-0 = <&pinctrl_pwm0_default>;
> +      };
> +
> +      tach: tach {
> +        compatible = "aspeed,ast2600-tach";
> +        #address-cells = <1>;
> +        #size-cells = <0>;

Ditto.

> +        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.

s/can support/supports/
s/upto/up to/

> +  This module is part of the ast2600-pwm-tach multi-function device. For more
> +  details see ../mfd/aspeed,ast2600-pwm-tach.yaml.
> +

Missing $ref to pwm.yaml

> +properties:
> +  compatible:


Below, same comments apply.

This is incomplete review.

Best regards,
Krzysztof