linux-kernel - Re: [PATCH v3 2/2] ARM: dts: Add support for pcb8385

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Message-ID: <e488ca6f-0c55-4006-8b8f-6e6a05f6f6df@kernel.org>
Date: Sat, 29 Nov 2025 10:15:39 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Horatiu Vultur <horatiu.vultur@...rochip.com>
Cc: robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org,
 nicolas.ferre@...rochip.com, alexandre.belloni@...tlin.com,
 claudiu.beznea@...on.dev, wsa+renesas@...g-engineering.com,
 Ryan.Wanner@...rochip.com, romain.sioen@...rochip.com,
 devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/2] ARM: dts: Add support for pcb8385

On 28/11/2025 14:04, Horatiu Vultur wrote:
> The 11/28/2025 10:08, Krzysztof Kozlowski wrote:
>> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
>>
>> On 27/11/2025 10:24, Horatiu Vultur wrote:
>>> The 11/26/2025 11:24, Krzysztof Kozlowski wrote:
>>>>
>>>
>>> Hi Krzysztof,
>>>
>>>>> +
>>>>> +&flx0 {
>>>>> +     atmel,flexcom-mode = <ATMEL_FLEXCOM_MODE_TWI>;
>>>>> +     status = "okay";
>>>>> +
>>>>> +     i2c0: i2c@600 {
>>>>
>>>> You added a label, so this feels like a new node, but then you miss
>>>> compatible and status feels redundant.
>>>
>>> Ah.. OK. I didn't want to add a new node.
>>>
>>>>
>>>> If this is override, you should rather override by labels/phandles in
>>>> the first place. Even when overriding by full node path, you should not
>>>> add custom labels - they belong to the base SoC.
>>>
>>> I can remove the label.
>>> So, when I want to override or extend with new properties I should
>>> labels?
>>
>>
>> Yes, child of serial engine should still be extended by label/phandle,
>> unless this SoC subsystem has different rule.
> 
> What do you mean by "child of serial engine"?

flx is your serial engine, no? It's child is i2c or whatever other
interface.


Best regards,
Krzysztof