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

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Date:   Fri, 19 Aug 2022 11:47:33 +0300
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Sergiu.Moga@...rochip.com, lee@...nel.org, 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
Cc:     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 19/08/2022 11:38, 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.

Sorry, but that's poor argument. Driver subsystems match Linux
convention, not necessarily hardware type/naming. Bindings directories
match hardware. MFD bindings are only for MFD wrapper drivers and this
is a serial interface. Not a MFD. You even do not add MFD devices in the
driver but add *always one* device depending on serial feature you want.
This is not even MFD device but regular platform device with children.

You put it in SoC, though, because all other SoCs store it there...

Best regards,
Krzysztof