It was <2021-08-11 śro 10:43>, when Krzysztof Kozlowski wrote:
> Convert Samsung Exynos SoC True Random Number Generator bindings to DT
> schema format using json-schema.
>
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
> ---
>  .../bindings/rng/samsung,exynos5250-trng.txt  | 17 -------
>  .../bindings/rng/samsung,exynos5250-trng.yaml | 44 +++++++++++++++++++
>  MAINTAINERS                                   |  2 +-
>  3 files changed, 45 insertions(+), 18 deletions(-)
>  delete mode 100644 Documentation/devicetree/bindings/rng/samsung,exynos5250-trng.txt
>  create mode 100644 Documentation/devicetree/bindings/rng/samsung,exynos5250-trng.yaml
>
> diff --git
> a/Documentation/devicetree/bindings/rng/samsung,exynos5250-trng.txt
> b/Documentation/devicetree/bindings/rng/samsung,exynos5250-trng.txt
> deleted file mode 100644
> index 5a613a4ec780..000000000000
> --- a/Documentation/devicetree/bindings/rng/samsung,exynos5250-trng.txt
> +++ /dev/null
> @@ -1,17 +0,0 @@
> -Exynos True Random Number Generator
> -
> -Required properties:
> -
> -- compatible  : Should be "samsung,exynos5250-trng".
> -- reg         : Specifies base physical address and size of the registers map.
> -- clocks      : Phandle to clock-controller plus clock-specifier pair.
> -- clock-names : "secss" as a clock name.
> -
> -Example:
> -
> -	rng@10830600 {
> -		compatible = "samsung,exynos5250-trng";
> -		reg = <0x10830600 0x100>;
> -		clocks = <&clock CLK_SSS>;
> -		clock-names = "secss";
> -	};
> diff --git
> a/Documentation/devicetree/bindings/rng/samsung,exynos5250-trng.yaml
> b/Documentation/devicetree/bindings/rng/samsung,exynos5250-trng.yaml
> new file mode 100644
> index 000000000000..a50c34d5d199
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/rng/samsung,exynos5250-trng.yaml
> @@ -0,0 +1,44 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id:
> https://protect2.fireeye.com/v1/url?k=f38ca35b-ac179a0d-f38d2814-0cc47a31ce52-1faa1ecb65482b8a&q=1&e=8b3490f9-a5fc-4da0-b2ee-7b0aec781403&u=http%3A%2F%2Fdevicetree.org%2Fschemas%2Frng%2Fsamsung%2Cexynos5250-trng.yaml%23
> +$schema:
> https://protect2.fireeye.com/v1/url?k=9409519d-cb9268cb-9408dad2-0cc47a31ce52-12394c4409905980&q=1&e=8b3490f9-a5fc-4da0-b2ee-7b0aec781403&u=http%3A%2F%2Fdevicetree.org%2Fmeta-schemas%2Fcore.yaml%23
> +
> +title: Samsung Exynos SoC True Random Number Generator
> +
> +maintainers:
> +  - Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
> +  - Łukasz Stelmach <l.stelmach@samsung.com>
> +
> +properties:
> +  compatible:
> +    const: samsung,exynos5250-trng
> +
> +  clocks:
> +    maxItems: 1

How about copying description from above into the description: property?

> +
> +  clock-names:
> +    items:
> +      - const: secss
> +
> +  reg:
> +    maxItems: 1

ditto.

> +
> +required:
> +  - compatible
> +  - clocks
> +  - clock-names
> +  - reg
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/exynos5250.h>
> +
> +    rng@10830600 {
> +        compatible = "samsung,exynos5250-trng";
> +        reg = <0x10830600 0x100>;
> +        clocks = <&clock CLK_SSS>;
> +        clock-names = "secss";
> +    };
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 4477215ef649..ebdb07a49b02 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -16398,7 +16398,7 @@ SAMSUNG EXYNOS TRUE RANDOM NUMBER GENERATOR (TRNG) DRIVER
>  M:	Łukasz Stelmach <l.stelmach@samsung.com>
>  L:	linux-samsung-soc@vger.kernel.org
>  S:	Maintained
> -F:	Documentation/devicetree/bindings/rng/samsung,exynos5250-trng.txt
> +F:	Documentation/devicetree/bindings/rng/samsung,exynos5250-trng.yaml
>  F:	drivers/char/hw_random/exynos-trng.c
>  
>  SAMSUNG FRAMEBUFFER DRIVER

-- 
Łukasz Stelmach
Samsung R&D Institute Poland
Samsung Electronics