linux-kernel - Re: [PATCH 2/2] dt-bindings: rng: convert Samsung Exynos TRNG to dtschema

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Message-ID: <dleftjtujnemx7.fsf%l.stelmach@samsung.com>
Date:   Wed, 18 Aug 2021 00:17:24 +0200
From:   Lukasz Stelmach <l.stelmach@...sung.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <maz@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Matt Mackall <mpm@...enic.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-crypto@...r.kernel.org
Subject: Re: [PATCH 2/2] dt-bindings: rng: convert Samsung Exynos TRNG to
 dtschema

It was <2021-08-17 wto 16:07>, when Krzysztof Kozlowski wrote:
> On 17/08/2021 14:34, Lukasz Stelmach wrote:
>> It was <2021-08-17 wto 12:05>, when Krzysztof Kozlowski wrote:
>>> On 17/08/2021 11:55, Lukasz Stelmach wrote:
>>>> 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@...onical.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@...30600 {
>>>>> -		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@...onical.com>
>>>>> +  - Łukasz Stelmach <l.stelmach@...sung.com>
>>>>> +
>>>>> +properties:
>>>>> +  compatible:
>>>>> +    const: samsung,exynos5250-trng
>>>>> +
>>>>> +  clocks:
>>>>> +    maxItems: 1
>>>>
>>>> How about copying description from above into the description: property?
>>>
>>> But what to copy? There is no description except generic clock bindings.
>>>
>> 
>> The description that "was" in the txt file.
>
> But there was no description of fields except copy&paste of the core
> schema. Do you describe C code like:
>
> ...
> /* unsigned int is a integer number greater or equal 0 */
> unsigned int i;
> ...

I believe having descriptions for reg and clocks

>>>>> -- reg         : Specifies base physical address and size of the registers map.
>>>>> -- clocks      : Phandle to clock-controller plus clock-specifier pair.

right next to properties' formal definitions is beneficial for anyone
browsing the YAML file. If you think otherwise, oh well, I am fine with
that.

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

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