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Date:   Fri, 9 Apr 2021 12:55:51 -0500
From:   Rob Herring <robh@kernel.org>
To:     Johan Jonker <jbx6244@gmail.com>
Cc:     heiko@sntech.de, thierry.reding@gmail.com,
        u.kleine-koenig@pengutronix.de, lee.jones@linaro.org,
        linux-pwm@vger.kernel.org, devicetree@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org,
        linux-rockchip@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v1 1/2] dt-bindings: pwm: convert pwm-rockchip.txt to YAML
Message-ID: <20210409175551.GA3769113@robh.at.kernel.org>
References: <20210406155053.29101-1-jbx6244@gmail.com>
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In-Reply-To: <20210406155053.29101-1-jbx6244@gmail.com>
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On Tue, Apr 06, 2021 at 05:50:52PM +0200, Johan Jonker wrote:
> Current dts files with 'pwm' nodes are manually verified.
> In order to automate this process pwm-rockchip.txt
> has to be converted to yaml.
> 
> Signed-off-by: Johan Jonker <jbx6244@gmail.com>
> ---
>  .../devicetree/bindings/pwm/pwm-rockchip.txt       | 27 ---------
>  .../devicetree/bindings/pwm/pwm-rockchip.yaml      | 66 ++++++++++++++++++++++
>  2 files changed, 66 insertions(+), 27 deletions(-)
>  delete mode 100644 Documentation/devicetree/bindings/pwm/pwm-rockchip.txt
>  create mode 100644 Documentation/devicetree/bindings/pwm/pwm-rockchip.yaml
> 
> diff --git a/Documentation/devicetree/bindings/pwm/pwm-rockchip.txt b/Documentation/devicetree/bindings/pwm/pwm-rockchip.txt
> deleted file mode 100644
> index f70956dea..000000000
> --- a/Documentation/devicetree/bindings/pwm/pwm-rockchip.txt
> +++ /dev/null
> @@ -1,27 +0,0 @@
> -Rockchip PWM controller
> -
> -Required properties:
> - - compatible: should be "rockchip,<name>-pwm"
> -   "rockchip,rk2928-pwm": found on RK29XX,RK3066 and RK3188 SoCs
> -   "rockchip,rk3288-pwm": found on RK3288 SOC
> -   "rockchip,rv1108-pwm", "rockchip,rk3288-pwm": found on RV1108 SoC
> -   "rockchip,vop-pwm": found integrated in VOP on RK3288 SoC
> - - reg: physical base address and length of the controller's registers
> - - clocks: See ../clock/clock-bindings.txt
> -   - For older hardware (rk2928, rk3066, rk3188, rk3228, rk3288, rk3399):
> -     - There is one clock that's used both to derive the functional clock
> -       for the device and as the bus clock.
> -   - For newer hardware (rk3328 and future socs): specified by name
> -     - "pwm": This is used to derive the functional clock.
> -     - "pclk": This is the APB bus clock.
> - - #pwm-cells: must be 2 (rk2928) or 3 (rk3288). See pwm.yaml in this directory
> -   for a description of the cell format.
> -
> -Example:
> -
> -	pwm0: pwm@20030000 {
> -		compatible = "rockchip,rk2928-pwm";
> -		reg = <0x20030000 0x10>;
> -		clocks = <&cru PCLK_PWM01>;
> -		#pwm-cells = <2>;
> -	};
> diff --git a/Documentation/devicetree/bindings/pwm/pwm-rockchip.yaml b/Documentation/devicetree/bindings/pwm/pwm-rockchip.yaml
> new file mode 100644
> index 000000000..cfd637d3e
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pwm/pwm-rockchip.yaml
> @@ -0,0 +1,66 @@
> +# SPDX-License-Identifier: GPL-2.0
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/pwm/pwm-rockchip.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Rockchip PWM controller
> +
> +maintainers:
> +  - Heiko Stuebner <heiko@sntech.de>
> +
> +properties:
> +  compatible:
> +    oneOf:
> +      - const: rockchip,rk2928-pwm
> +      - const: rockchip,rk3288-pwm
> +      - const: rockchip,vop-pwm
> +      - items:
> +          - enum:
> +              - rockchip,rv1108-pwm
> +          - const: rockchip,rk3288-pwm
> +
> +  reg:
> +    maxItems: 1
> +
> +  clocks:
> +    minItems: 1
> +    maxItems: 2
> +    description:
> +      For older hardware (rk2928, rk3066, rk3188, rk3228, rk3288, rk3399)
> +        There is one clock that is used both to derive the functional clock
> +        for the device and as the bus clock.
> +      For newer hardware (rk3328 and future SoCs) that is also specified

Can you express this with a schema.

> +      with clock names.
> +        "pwm" is used to derive the functional clock for the device.
> +        "pclk" is used as the APB bus clock.

Let's not document the names twice.

> +
> +  clock-names:
> +    minItems: 1
> +    items:
> +      - const: pwm
> +      - const: pclk
> +
> +  "#pwm-cells":
> +    enum: [2, 3]
> +    description:
> +      Must be 2 (rk2928) or 3 (rk3288).
> +      See pwm.yaml for a description of the cell format.
> +
> +additionalProperties: false
> +
> +required:
> +  - compatible
> +  - reg
> +  - clocks
> +  - "#pwm-cells"
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/rk3188-cru-common.h>
> +    pwm0: pwm@20030000 {
> +      compatible = "rockchip,rk2928-pwm";
> +      reg = <0x20030000 0x10>;
> +      clocks = <&cru PCLK_PWM01>;
> +      #pwm-cells = <2>;
> +    };
> -- 
> 2.11.0
>