linux-kernel - Re: [PATCH 2/5] dt-bindings: mfd: atmel,at91-usart: convert to json-schema

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Date:   Mon, 5 Sep 2022 18:12:15 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Sergiu.Moga@...rochip.com, lee@...nel.org
Cc:     robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        Nicolas.Ferre@...rochip.com, alexandre.belloni@...tlin.com,
        Claudiu.Beznea@...rochip.com, radu_nicolae.pirea@....ro,
        richard.genoud@...il.com, mturquette@...libre.com,
        sboyd@...nel.org, gregkh@...uxfoundation.org, jirislaby@...nel.org,
        admin@...iphile.com, Kavyasree.Kotagiri@...rochip.com,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-spi@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-serial@...r.kernel.org
Subject: Re: [PATCH 2/5] dt-bindings: mfd: atmel,at91-usart: convert to
 json-schema

On 05/09/2022 17:22, Sergiu.Moga@...rochip.com wrote:
> On 05.09.2022 17:37, Lee Jones wrote:
>>
>> On Fri, 19 Aug 2022, Sergiu.Moga@...rochip.com wrote:
>>
>>> On 18.08.2022 11:39, Krzysztof Kozlowski wrote:
>>>> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
>>>>
>>>> On 17/08/2022 10:55, Sergiu Moga wrote:
>>>>> Convert at91 USART DT Binding for Atmel/Microchip SoCs to
>>>>> json-schema format.
>>>>>
>>>>> Signed-off-by: Sergiu Moga <sergiu.moga@...rochip.com>
>>>>> ---
>>>>>    .../bindings/mfd/atmel,at91-usart.yaml        | 190 ++++++++++++++++++
>>>>>    .../devicetree/bindings/mfd/atmel-usart.txt   |  98 ---------
>>>>>    2 files changed, 190 insertions(+), 98 deletions(-)
>>>>>    create mode 100644 Documentation/devicetree/bindings/mfd/atmel,at91-usart.yaml
>>>>>    delete mode 100644 Documentation/devicetree/bindings/mfd/atmel-usart.txt
>>>>>
>>>>> diff --git a/Documentation/devicetree/bindings/mfd/atmel,at91-usart.yaml b/Documentation/devicetree/bindings/mfd/atmel,at91-usart.yaml
>>>>> new file mode 100644
>>>>> index 000000000000..cf15d73fa1e8
>>>>> --- /dev/null
>>>>> +++ b/Documentation/devicetree/bindings/mfd/atmel,at91-usart.yaml
>>>> One more thing - I think this should be in serial directory, not mfd,
>>>> even though it includes SPI. MFD is just a Linux naming/wrapper device.
>>>>
>>>> Best regards,
>>>> Krzysztof
>>>
>>> I would rather keep it in this directory, since its corresponding driver
>>> is also in the mfd directory.
>>
>> Looks like a UART driver to me.
>>
>> Which MFD driver does this pertain to?
>>
>> --
>> Lee Jones [李琼斯]
> 
> Hi,
> 
> It's this one: drivers/mfd/at91-usart.c[1]
> 
> 
> [1] 
> https://elixir.bootlin.com/linux/v6.0-rc4/source/drivers/mfd/at91-usart.c

Which is not a "real MFD driver" because it probes exactly one child
(depending on the chosen serial protocol). Aren't MFD supposed to have
more then one child?


Best regards,
Krzysztof