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From:   Rob Herring <robh+dt@kernel.org>
Date:   Fri, 20 Sep 2019 10:50:50 -0500
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Subject: Re: [PATCH v2 8/8] dt-bindings: pwm: Convert Samsung PWM bindings to json-schema
To:     Krzysztof Kozlowski <krzk@kernel.org>
Cc:     Mark Rutland <mark.rutland@arm.com>,
        Thierry Reding <thierry.reding@gmail.com>,
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On Wed, Sep 18, 2019 at 12:32 PM Krzysztof Kozlowski <krzk@kernel.org> wrote:
>
> Convert Samsung PWM (S3C, S5P and Exynos SoCs) bindings to DT schema
> format using json-schema.
>
> Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
>
> ---
>
> Changes since v1:
> 1. Indent example with four spaces (more readable),
> 2. Fix samsung,pwm-outputs after review,
> 3. Remove double-quotes from clock names.
> ---
>  .../devicetree/bindings/pwm/pwm-samsung.txt   |  51 ---------
>  .../devicetree/bindings/pwm/pwm-samsung.yaml  | 107 ++++++++++++++++++
>  2 files changed, 107 insertions(+), 51 deletions(-)
>  delete mode 100644 Documentation/devicetree/bindings/pwm/pwm-samsung.txt
>  create mode 100644 Documentation/devicetree/bindings/pwm/pwm-samsung.yaml
>
> diff --git a/Documentation/devicetree/bindings/pwm/pwm-samsung.txt b/Documentation/devicetree/bindings/pwm/pwm-samsung.txt
> deleted file mode 100644
> index 5538de9c2007..000000000000
> --- a/Documentation/devicetree/bindings/pwm/pwm-samsung.txt
> +++ /dev/null
> @@ -1,51 +0,0 @@
> -* Samsung PWM timers
> -
> -Samsung SoCs contain PWM timer blocks which can be used for system clock source
> -and clock event timers, as well as to drive SoC outputs with PWM signal. Each
> -PWM timer block provides 5 PWM channels (not all of them can drive physical
> -outputs - see SoC and board manual).
> -
> -Be aware that the clocksource driver supports only uniprocessor systems.
> -
> -Required properties:
> -- compatible : should be one of following:
> -    samsung,s3c2410-pwm - for 16-bit timers present on S3C24xx SoCs
> -    samsung,s3c6400-pwm - for 32-bit timers present on S3C64xx SoCs
> -    samsung,s5p6440-pwm - for 32-bit timers present on S5P64x0 SoCs
> -    samsung,s5pc100-pwm - for 32-bit timers present on S5PC100, S5PV210,
> -                         Exynos4210 rev0 SoCs
> -    samsung,exynos4210-pwm - for 32-bit timers present on Exynos4210,
> -                          Exynos4x12, Exynos5250 and Exynos5420 SoCs
> -- reg: base address and size of register area
> -- interrupts: list of timer interrupts (one interrupt per timer, starting at
> -  timer 0)
> -- clock-names: should contain all following required clock names:
> -    - "timers" - PWM base clock used to generate PWM signals,
> -  and any subset of following optional clock names:
> -    - "pwm-tclk0" - first external PWM clock source,
> -    - "pwm-tclk1" - second external PWM clock source.
> -  Note that not all IP variants allow using all external clock sources.
> -  Refer to SoC documentation to learn which clock source configurations
> -  are available.
> -- clocks: should contain clock specifiers of all clocks, which input names
> -  have been specified in clock-names property, in same order.
> -- #pwm-cells: should be 3. See pwm.txt in this directory for a description of
> -  the cells format. The only third cell flag supported by this binding is
> -  PWM_POLARITY_INVERTED.
> -
> -Optional properties:
> -- samsung,pwm-outputs: list of PWM channels used as PWM outputs on particular
> -    platform - an array of up to 5 elements being indices of PWM channels
> -    (from 0 to 4), the order does not matter.
> -
> -Example:
> -       pwm@7f006000 {
> -               compatible = "samsung,s3c6400-pwm";
> -               reg = <0x7f006000 0x1000>;
> -               interrupt-parent = <&vic0>;
> -               interrupts = <23>, <24>, <25>, <27>, <28>;
> -               clocks = <&clock 67>;
> -               clock-names = "timers";
> -               samsung,pwm-outputs = <0>, <1>;
> -               #pwm-cells = <3>;
> -       }
> diff --git a/Documentation/devicetree/bindings/pwm/pwm-samsung.yaml b/Documentation/devicetree/bindings/pwm/pwm-samsung.yaml
> new file mode 100644
> index 000000000000..06d11faabff6
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pwm/pwm-samsung.yaml
> @@ -0,0 +1,107 @@
> +# SPDX-License-Identifier: GPL-2.0
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/pwm/pwm-samsung.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Samsung SoC PWM timers
> +
> +maintainers:
> +  - Thierry Reding <thierry.reding@gmail.com>
> +  - Krzysztof Kozlowski <krzk@kernel.org>
> +
> +description: |+
> +  Samsung SoCs contain PWM timer blocks which can be used for system clock source
> +  and clock event timers, as well as to drive SoC outputs with PWM signal. Each
> +  PWM timer block provides 5 PWM channels (not all of them can drive physical
> +  outputs - see SoC and board manual).
> +
> +  Be aware that the clocksource driver supports only uniprocessor systems.
> +
> +allOf:
> +  - $ref: pwm.yaml#
> +
> +properties:
> +  compatible:
> +    enum:
> +      - samsung,s3c2410-pwm             # 16-bit, S3C24xx
> +      - samsung,s3c6400-pwm             # 32-bit, S3C64xx
> +      - samsung,s5p6440-pwm             # 32-bit, S5P64x0
> +      - samsung,s5pc100-pwm             # 32-bit, S5PC100, S5PV210, Exynos4210 rev0 SoCs
> +      - samsung,exynos4210-pwm          # 32-bit, Exynos
> +
> +  reg:
> +    maxItems: 1
> +
> +  clocks:
> +    minItems: 1
> +    maxItems: 3
> +
> +  clock-names:
> +    description: |
> +      Should contain all following required clock names:
> +      - "timers" - PWM base clock used to generate PWM signals,
> +      and any subset of following optional clock names:
> +      - "pwm-tclk0" - first external PWM clock source,
> +      - "pwm-tclk1" - second external PWM clock source.
> +      Note that not all IP variants allow using all external clock sources.
> +      Refer to SoC documentation to learn which clock source configurations
> +      are available.
> +    oneOf:
> +      - items:
> +        - const: timers
> +      - items:
> +        - const: timers
> +        - const: pwm-tclk0
> +      - items:
> +        - const: timers
> +        - const: pwm-tclk1
> +      - items:
> +        - const: timers
> +        - const: pwm-tclk0
> +        - const: pwm-tclk1
> +
> +  interrupts:
> +    description:
> +      One interrupt per timer, starting at timer 0.
> +    minItems: 1
> +    maxItems: 5
> +
> +  "#pwm-cells":
> +    description:
> +      The only third cell flag supported by this binding
> +      is PWM_POLARITY_INVERTED.
> +    const: 3
> +
> +  samsung,pwm-outputs:
> +    description:
> +      A list of PWM channels used as PWM outputs on particular platform.
> +      It is an array of up to 5 elements being indices of PWM channels
> +      (from 0 to 4), the order does not matter.
> +    allOf:
> +      - $ref: /schemas/types.yaml#/definitions/uint32-array
> +      - uniqueItems: true
> +      - items:
> +          minimum: 0
> +          maximum: 4
> +
> +required:
> +  - clocks
> +  - clock-names
> +  - compatible
> +  - interrupts
> +  - "#pwm-cells"
> +  - reg

additionalProperties: false

should work here. And in the rng binding too.

Rob