linux-kernel - Re: [PATCH v2 2/9] dt-bindings: riscv: microchip: document the aries m100pfsevp

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Date:   Tue, 30 Aug 2022 17:55:55 +0000
From:   <Conor.Dooley@...rochip.com>
To:     <krzysztof.kozlowski@...aro.org>, <Conor.Dooley@...rochip.com>,
        <robh+dt@...nel.org>, <krzysztof.kozlowski+dt@...aro.org>,
        <Daire.McNamara@...rochip.com>, <Shravan.Chippa@...rochip.com>
CC:     <paul.walmsley@...ive.com>, <palmer@...belt.com>,
        <aou@...s.berkeley.edu>, <Cyril.Jean@...rochip.com>,
        <Lewis.Hanly@...rochip.com>, <Praveen.Kumar@...rochip.com>,
        <wg@...es-embedded.de>, <Hugh.Breslin@...rochip.com>,
        <devicetree@...r.kernel.org>, <linux-riscv@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 2/9] dt-bindings: riscv: microchip: document the aries
 m100pfsevp

On 30/08/2022 18:47, Krzysztof Kozlowski wrote:
> On 30/08/2022 20:35, Conor.Dooley@...rochip.com wrote:
>> On 30/08/2022 18:30, Krzysztof Kozlowski wrote:
>>> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
>>>
>>> On 30/08/2022 19:59, Conor.Dooley@...rochip.com wrote:
>>>>>> w dts were
>>>>>> needed so that the gpio-hog could be set correctly. Out of curiosity, I can
>>>>>> have the same compatible in multiple devicetrees right? In that case, it
>>>>>> would just be "aries,m100pfsevp" here and I could put that in both?
>>>>>> Would make things easier..
>>>>>
>>>>> Depends, but I would say for this case rather not. The compatible should
>>>>> identify the board. If the boards are different, one compatible should
>>>>> not identify both of them. Imagine U-Boot (or something else) trying to
>>>>> match the DTS.
>>>>
>>>> It is the same board though, the way the bootloader works is that if it
>>>> detects an SD-card it will use that to boot from, and if not will fall back
>>>> to the emmc.
>>>
>>> Wait, I might miss that part. So this is exactly the same hardware with
>>> the same SoM/SoC, same eMMC and SD card, except that one has plugged
>>> this SD card (as it is hot-pluggable)?
> 
> Then two thoughts:
> 1. It is indeed one compatible because it is exactly the same hardware
> (I don't consider plugged SD card as part of it, just like plugged USB).

Cool.

> 
> 2. Then I don't think you should have two boards in the kernel. It's
> fine if bootloaders have two of them or to store an overlay in the
> kernel or somewhere. But two boards for the same board differing by
> hot-plug setup is not for Linux kernel.

Fine by me too. Easy enough to sort that out in u-boot or w/e (and do
whatever suits in a vendor tree).

Thanks Krzysztof :)