linux-kernel - Re: Aw: [PATCH v3 1/2] arm64: dts: mt7986: add dtbs with applied overlays for bpi-r3

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Date: Thu, 27 Jun 2024 12:28:54 +0200
From: Frank Wunderlich <frank-w@...lic-files.de>
To: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
 Matthias Brugger <matthias.bgg@...il.com>, Rob Herring <robh@...nel.org>
CC: Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>,
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-mediatek@...ts.infradead.org, devicetree@...r.kernel.org,
 Daniel Golle <daniel@...rotopia.org>, Rob Herring <robh+dt@...nel.org>,
 Frank Wunderlich <linux@...web.de>
Subject: Re: Aw: [PATCH v3 1/2] arm64: dts: mt7986: add dtbs with applied overlays for bpi-r3

Am 27. Juni 2024 12:10:17 MESZ schrieb AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>:
>Il 26/06/24 22:45, Frank Wunderlich ha scritto:
>> any suggestions? hoping it does no laying around so long as v2
>> 
>
>So you're trying to just test that the overlay is valid and can actually be
>overlaid to the base dts?
>
>I'm not sure that this is the right/best way... and I honestly have no time
>to check that *exactly right now*, even though that should be.
>
>I have to be convinced of what I'm doing before applying patches, and I know
>that this was sent a bit of time ago, but I really didn't have any time to
>dig into that... let's see if for some miracle I can do that for this cycle
>otherwise it's going to be the next one.
>
>I mean no disrespect to Rob who suggested this change, but I still want to
>check that on my own before picking it.
>

>> 
>> 
>>> Gesendet: Samstag, 08. Juni 2024 um 10:05 Uhr
>>> Von: "Frank Wunderlich" <linux@...web.de>

>>> Betreff: [PATCH v3 1/2] arm64: dts: mt7986: add dtbs with applied overlays for bpi-r3
>>> 
>>> From: Frank Wunderlich <frank-w@...lic-files.de>
>>> 
>>> Build devicetree binaries for testing overlays and providing users
>>> full dtb without using overlays.
>>> 
>>> Suggested-by: Rob Herring <robh+dt@...nel.org>
 https://lore.kernel.org/all/CAL_JsqK_3xxD0DFwipXO85P=q=EYjUdjE1_8g1MKtvw3vVzx5A@mail.gmail.com/
>>> https://lore.kernel.org/all/CAL_JsqJSi=kJSix=f3787ULZnaCy_Y26Phdhy5y9fat_vkDuUw@mail.gmail.com/
>>> 
>>> v2:
>>> make full dtbs multiline for better readability
>>> ---
>>>   arch/arm64/boot/dts/mediatek/Makefile | 21 +++++++++++++++++++++
>>>   1 file changed, 21 insertions(+)
>>> 
>>> diff --git a/arch/arm64/boot/dts/mediatek/Makefile b/arch/arm64/boot/dts/mediatek/Makefile
>>> index 37b4ca3a87c9..0ec5b904d35d 100644
>>> --- a/arch/arm64/boot/dts/mediatek/Makefile
>>> +++ b/arch/arm64/boot/dts/mediatek/Makefile
>>> @@ -15,6 +15,27 @@ dtb-$(CONFIG_ARCH_MEDIATEK) += mt7986a-bananapi-bpi-r3-emmc.dtbo
>>>   dtb-$(CONFIG_ARCH_MEDIATEK) += mt7986a-bananapi-bpi-r3-nand.dtbo
>>>   dtb-$(CONFIG_ARCH_MEDIATEK) += mt7986a-bananapi-bpi-r3-nor.dtbo
>>>   dtb-$(CONFIG_ARCH_MEDIATEK) += mt7986a-bananapi-bpi-r3-sd.dtbo
>>> +mt7986a-bananapi-bpi-r3-emmc-nand-dtbs := \
>>> +	mt7986a-bananapi-bpi-r3.dtb \
>>> +	mt7986a-bananapi-bpi-r3-emmc.dtbo \
>>> +	mt7986a-bananapi-bpi-r3-nand.dtbo
>>> +dtb-$(CONFIG_ARCH_MEDIATEK) += mt7986a-bananapi-bpi-r3-emmc-nand.dtb
>>> +mt7986a-bananapi-bpi-r3-emmc-nor-dtbs := \
>>> +	mt7986a-bananapi-bpi-r3.dtb \
>>> +	mt7986a-bananapi-bpi-r3-emmc.dtbo \
>>> +	mt7986a-bananapi-bpi-r3-nor.dtbo
>>> +dtb-$(CONFIG_ARCH_MEDIATEK) += mt7986a-bananapi-bpi-r3-emmc-nor.dtb
>>> +mt7986a-bananapi-bpi-r3-sd-nand-dtbs := \
>>> +	mt7986a-bananapi-bpi-r3.dtb \
>>> +	mt7986a-bananapi-bpi-r3-sd.dtbo \
>>> +	mt7986a-bananapi-bpi-r3-nand.dtbo
>>> +dtb-$(CONFIG_ARCH_MEDIATEK) += mt7986a-bananapi-bpi-r3-sd-nand.dtb
>>> +mt7986a-bananapi-bpi-r3-sd-nor-dtbs := \
>>> +	mt7986a-bananapi-bpi-r3.dtb \
>>> +	mt7986a-bananapi-bpi-r3-sd.dtbo \
>>> +	mt7986a-bananapi-bpi-r3-nor.dtbo
>>> +dtb-$(CONFIG_ARCH_MEDIATEK) += mt7986a-bananapi-bpi-r3-sd-nor.dtb
>>> +
>>>   dtb-$(CONFIG_ARCH_MEDIATEK) += mt7986a-rfb.dtb
>>>   dtb-$(CONFIG_ARCH_MEDIATEK) += mt7986b-rfb.dtb
>>>   dtb-$(CONFIG_ARCH_MEDIATEK) += mt7988a-bananapi-bpi-r4.dtb
>>> --
>>> 2.34.1
>>> 
>>> 
>

Yes, 1st reason is to check if overlay can be applied to base dts (the part rob was requested). The second thing that was solved is that some users wanting a "full" dtb without the need to handle overlays in bootloader. Due to hardware design of the board there are 4 "full" dtb's.

So i adressed both in one Patch. I myself (and openwrt) still use the overlays and apply them after probing hardware in uboot...so for me it is not needed but requested from others. Current state was defined as broken by rob and for future additions (like mt7988/bpi-r4) we want to have a blueprint.

I hope you find time to look into it to have it solved soon and avoid discussions like the 2 links from commit message in future...then we have a reference for similar situations.


regards Frank