linux-kernel - Re: [PATCH 2/2] arm64: dts: rockchip: rock-pi-s add more peripherals

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Date:   Wed, 8 Jun 2022 15:08:41 +0200
From:   Michael Riesch <michael.riesch@...fvision.net>
To:     Heiko Stübner <heiko@...ech.de>,
        linux-rockchip@...ts.infradead.org,
        Sjoerd Simons <sjoerd@...labora.com>
Cc:     kernel@...labora.com, Akash Gajjar <akash@...nedev.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] arm64: dts: rockchip: rock-pi-s add more peripherals

Hi all,

On 6/8/22 14:19, Heiko Stübner wrote:
> Am Mittwoch, 8. Juni 2022, 14:07:33 CEST schrieb Sjoerd Simons:
>> Hey Michael,
>>
>> On Mon, 2022-06-06 at 14:00 +0200, Michael Riesch wrote:
>>>
>>>> +       aliases {
>>>> +               ethernet0 = &gmac;
>>>> +               mmc0 = &emmc;
>>>> +               mmc1 = &sdmmc;
>>>
>>> Sure? emmc is at address ff49000 which is larger than sdmmc's address
>>> ff480000. I believe the aliases should be sorted w.r.t. addresses.
>>
>> Do you have a reference about this sorting requirement?

No, not really. I did have the impression that such a convention existed...

> I do believe we used that mmcx -> *mmc-device sorted by address
> when the aliases still were in the main soc dtsi. Simply because one
> couldn't really know what was available on a specific board
> (no emmc for example).

... and this seems to be the case indeed...

> I guess now on a per-board level we could actually do that more relaxed
> and let that be the decision of the board submitter ;-) .

... but apparently the convention is not that crucial anymore :-) Just
wanted to point it out.

>> Also do you mean that mmc0 should be &sdmmc *or* that the aliases
>> should have mmc1 listed first.

FTR, I would have suggested

mmc0 = &sdmmc;
mmc1 = &emmc;

according to said convention, but then I would also take a look on
whatever any other rk3308 boards do and aim to be in sync...

>> For reference the reason is that mmc0 is emmc is because it seems more
>> logical to have the builtin devices come first (e.g. as mmcblk0) 

... unless there is a good reason not to. You be the judge of that ;-)

Best regards,
Michael

>> [...]