linux-kernel - Re: [RFC 7/9] dt-bindings: rtc: s3c: Convert S3C/Exynos RTC bindings to json-schema

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Date:   Mon, 26 Aug 2019 07:06:02 -0500
From:   Rob Herring <robh+dt@...nel.org>
To:     Krzysztof Kozlowski <krzk@...nel.org>
Cc:     Mark Rutland <mark.rutland@....com>,
        Jonathan Cameron <jic23@...nel.org>,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Paweł Chmiel <pawel.mikolaj.chmiel@...il.com>,
        devicetree@...r.kernel.org,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "open list:IIO SUBSYSTEM AND DRIVERS" <linux-iio@...r.kernel.org>,
        "open list:REAL TIME CLOCK (RTC) SUBSYSTEM" 
        <linux-rtc@...r.kernel.org>, notify@...nel.org,
        Arnd Bergmann <arnd@...db.de>, Olof Johansson <olof@...om.net>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Tomasz Figa <tomasz.figa@...il.com>
Subject: Re: [RFC 7/9] dt-bindings: rtc: s3c: Convert S3C/Exynos RTC bindings
 to json-schema

On Fri, Aug 23, 2019 at 9:54 AM Krzysztof Kozlowski <krzk@...nel.org> wrote:
>
> Convert Samsung S3C/Exynos Real Time Clock bindings to DT schema format
> using json-schema.
>
> Signed-off-by: Krzysztof Kozlowski <krzk@...nel.org>
> ---
>  .../devicetree/bindings/rtc/s3c-rtc.txt       | 31 ------
>  .../devicetree/bindings/rtc/s3c-rtc.yaml      | 95 +++++++++++++++++++
>  2 files changed, 95 insertions(+), 31 deletions(-)
>  delete mode 100644 Documentation/devicetree/bindings/rtc/s3c-rtc.txt
>  create mode 100644 Documentation/devicetree/bindings/rtc/s3c-rtc.yaml


> diff --git a/Documentation/devicetree/bindings/rtc/s3c-rtc.yaml b/Documentation/devicetree/bindings/rtc/s3c-rtc.yaml
> new file mode 100644
> index 000000000000..44b021812a83
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/rtc/s3c-rtc.yaml
> @@ -0,0 +1,95 @@
> +# SPDX-License-Identifier: GPL-2.0
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/rtc/s3c-rtc.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Samsung S3C, S5P and Exynos Real Time Clock controller
> +
> +maintainers:
> +  - Krzysztof Kozlowski <krzk@...nel.org>
> +
> +# Select also deprecated compatibles (for finding deprecate usage)
> +select:
> +  properties:
> +    compatible:
> +      items:
> +        - enum:
> +            - samsung,s3c2410-rtc
> +            - samsung,s3c2416-rtc
> +            - samsung,s3c2443-rtc
> +            - samsung,s3c6410-rtc
> +            # Deprecated, use samsung,s3c6410-rtc
> +            - samsung,exynos3250-rtc

We've come up with a better way of doing this that doesn't need a
custom 'select'. Add a 'oneOf' to compatible and add another entry:

- const: samsung,exynos3250-rtc
  deprecated: true

It's not implemented yet in the tool, but we'll keep the compatible
for 'select' and otherwise drop schema marked deprecated.

> +  required:
> +    - compatible
> +
> +properties:
> +  compatible:
> +    items:
> +      - enum:

You can drop 'items' when there's only 1 entry.

> +          - samsung,s3c2410-rtc
> +          - samsung,s3c2416-rtc
> +          - samsung,s3c2443-rtc
> +          - samsung,s3c6410-rtc
> +  reg:
> +    maxItems: 1
> +
> +  clocks:
> +    description:
> +      Must contain a list of phandle and clock specifier for the rtc
> +      clock and in the case of a s3c6410 compatible controller, also
> +      a source clock.
> +    minItems: 1
> +    maxItems: 2
> +
> +  clock-names:
> +    description:
> +      Must contain "rtc" and for a s3c6410 compatible controller,
> +      a "rtc_src" sorted in the same order as the clocks property.
> +    oneOf:
> +      - items:
> +          - const: rtc
> +      - items:
> +          # TODO: This can be in any order matching clocks, how to express it?

It shouldn't be in any order. Fix the dts files.

> +          - const: rtc
> +          - const: rtc_src

You should drop all this and add an else clause below.

> +
> +  interrupts:
> +    description:
> +      Two interrupt numbers to the cpu should be specified. First
> +      interrupt number is the rtc alarm interrupt and second interrupt number
> +      is the rtc tick interrupt. The number of cells representing a interrupt
> +      depends on the parent interrupt controller.
> +    minItems: 2
> +    maxItems: 2
> +
> +allOf:
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            enum:
> +              - samsung,s3c6410-rtc
> +              - samsung,exynos3250-rtc
> +
> +    then:
> +      properties:
> +        clocks:
> +          minItems: 2
> +          maxItems: 2
> +        clock-names:
> +          items:
> +          - const: rtc
> +          - const: rtc_src

Should be indented 2 more spaces.

> +
> +examples:
> +  - |
> +    rtc@...70000 {
> +      compatible = "samsung,s3c6410-rtc";
> +      reg = <0x10070000 0x100>;
> +      interrupts = <0 44 4>, <0 45 4>;
> +      clocks = <&clock 0>, // CLK_RTC
> +               <&s2mps11_osc 0>; // S2MPS11_CLK_AP
> +      clock-names = "rtc", "rtc_src";
> +    };
> --
> 2.17.1
>