linux-kernel - Aw: Re: [RFC v3 11/11] arm64: dts: mt7986: add BPI-R3 nand/nor overlays

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Date:   Tue, 15 Nov 2022 17:50:09 +0100
From:   Frank Wunderlich <frank-w@...lic-files.de>
To:     Matthias Brugger <matthias.bgg@...il.com>
Cc:     Frank Wunderlich <linux@...web.de>,
        linux-mediatek@...ts.infradead.org,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Aw: Re: [RFC v3 11/11] arm64: dts: mt7986: add BPI-R3 nand/nor
 overlays

Hi


> Gesendet: Freitag, 11. November 2022 um 10:16 Uhr
> Von: "Matthias Brugger" <matthias.bgg@...il.com>
> An: "Frank Wunderlich" <linux@...web.de>, linux-mediatek@...ts.infradead.org, "Rob Herring" <robh+dt@...nel.org>, "Krzysztof Kozlowski" <krzysztof.kozlowski+dt@...aro.org>
> Cc: "Frank Wunderlich" <frank-w@...lic-files.de>, linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
> Betreff: Re: [RFC v3 11/11] arm64: dts: mt7986: add BPI-R3 nand/nor overlays
>
> Rob, Krzysztof,
>
> On 06/11/2022 09:50, Frank Wunderlich wrote:
> > From: Frank Wunderlich <frank-w@...lic-files.de>
> >
> > Add devicetree overlays for using nand and nor on BPI-R3.
> >
> > Signed-off-by: Frank Wunderlich <frank-w@...lic-files.de>
> > ---
> >   arch/arm64/boot/dts/mediatek/Makefile         |  2 +
> >   .../mediatek/mt7986a-bananapi-bpi-r3-nand.dts | 53 +++++++++++++++
> >   .../mediatek/mt7986a-bananapi-bpi-r3-nor.dts  | 67 +++++++++++++++++++
> >   3 files changed, 122 insertions(+)
> >   create mode 100644 arch/arm64/boot/dts/mediatek/mt7986a-bananapi-bpi-r3-nand.dts
> >   create mode 100644 arch/arm64/boot/dts/mediatek/mt7986a-bananapi-bpi-r3-nor.dts
> >
> > diff --git a/arch/arm64/boot/dts/mediatek/Makefile b/arch/arm64/boot/dts/mediatek/Makefile
> > index e8902f2cc58f..d42208c4090d 100644
> > --- a/arch/arm64/boot/dts/mediatek/Makefile
> > +++ b/arch/arm64/boot/dts/mediatek/Makefile
> > @@ -8,6 +8,8 @@ dtb-$(CONFIG_ARCH_MEDIATEK) += mt6797-x20-dev.dtb
> >   dtb-$(CONFIG_ARCH_MEDIATEK) += mt7622-rfb1.dtb
> >   dtb-$(CONFIG_ARCH_MEDIATEK) += mt7622-bananapi-bpi-r64.dtb
> >   dtb-$(CONFIG_ARCH_MEDIATEK) += mt7986a-bananapi-bpi-r3-emmc.dtb
> > +dtb-$(CONFIG_ARCH_MEDIATEK) += mt7986a-bananapi-bpi-r3-nand.dtbo
> > +dtb-$(CONFIG_ARCH_MEDIATEK) += mt7986a-bananapi-bpi-r3-nor.dtbo
>
> Do we allow the inclusion of overlays in the kernel?
> I don't think so. I see there are some dtbos for some freescale platforms, but I
> wasn't aware that we support that. I thought it is all about dtsi includes.
>
> @frank In any case we would need to apply these overlays to some base board to
> create a valis dtb.

yes of course, the "base board" is either the sd or the emmc fdt i added 1 patch before.
This way it allows all 4 combinations (sd+nand, sd+nor, emmc+nand, emmc+nor).

as i pointed in v4 of this Patch there is a commit in robs tree allow building dt overlays
from dtso-files...

"kbuild: Allow DTB overlays to built from .dtso named source files"
    https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git/commit/?h=dt/next&id=363547d2191cbc32ca954ba75d72908712398ff2

maybe this is the right way to go (rename my current dts to dtso)?

> Regards,
> Matthias

regards Frank