Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Message-ID: <3d689f8e-ae2d-2b3e-e783-94b8e6ba8aa0@linaro.org>
Date:   Wed, 23 Nov 2022 09:30:10 +0100
MIME-Version: 1.0
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101
 Thunderbird/102.5.0
Subject: Re: [v4 2/5] dt-bindings: pwm: Add bindings for aspeed pwm controller
Content-Language: en-US
To:     Billy Tsai <billy_tsai@aspeedtech.com>, jdelvare@suse.com,
        linux@roeck-us.net, robh+dt@kernel.org,
        krzysztof.kozlowski+dt@linaro.org, joel@jms.id.au, andrew@aj.id.au,
        lee@kernel.org, thierry.reding@gmail.com,
        u.kleine-koenig@pengutronix.de, corbet@lwn.net,
        p.zabel@pengutronix.de, linux-hwmon@vger.kernel.org,
        devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-aspeed@lists.ozlabs.org, linux-kernel@vger.kernel.org,
        linux-pwm@vger.kernel.org, linux-doc@vger.kernel.org
References: <20221123061635.32025-1-billy_tsai@aspeedtech.com>
 <20221123061635.32025-3-billy_tsai@aspeedtech.com>
From:   Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
In-Reply-To: <20221123061635.32025-3-billy_tsai@aspeedtech.com>
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 7bit
Precedence: bulk

On 23/11/2022 07:16, Billy Tsai wrote:
> Add the aspeed pwm device bindings which should be the child-node of
> pwm-tach mfd.

Subject: drop second, redundant "bindings".

> 
> Signed-off-by: Billy Tsai <billy_tsai@aspeedtech.com>
> ---
>  .../bindings/pwm/aspeed,ast2600-pwm.yaml      | 54 +++++++++++++++++++
>  1 file changed, 54 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/pwm/aspeed,ast2600-pwm.yaml
> 
> 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..68a60fc73902
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pwm/aspeed,ast2600-pwm.yaml
> @@ -0,0 +1,54 @@
> +# 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 supports up to 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.
> +
> +allOf:
> +  - $ref: pwm.yaml#
> +
> +properties:
> +  compatible:
> +    enum:
> +      - aspeed,ast2600-pwm
> +
> +  "#pwm-cells":
> +    const: 3

Blank line.

> +patternProperties:
> +  "^pwm@[a-z0-9]+$":
> +    description: Set extend properties for each pwm channel.

Description is not a correct sentence. Description explains the hardware
property you have here.

> +    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

Why maximum is 255? Why 0=100%? 0 should be equal to 0 and maximum to
some maximum value (e.g. 100%). If these are percents, use appropriate
units. If these are not - what are these? You need a $ref in such case.

> +    required:
> +      - reg
> +
> +required:
> +  - compatible
> +
> +additionalProperties: false

Best regards,
Krzysztof