linux-kernel - Re: [PATCH v1] arm64: dts: mt7986: add overlay for SATA power socket on BPI-R3

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Message-ID: <CAL_JsqJSi=kJSix=f3787ULZnaCy_Y26Phdhy5y9fat_vkDuUw@mail.gmail.com>
Date:   Mon, 11 Sep 2023 16:06:16 -0500
From:   Rob Herring <robh+dt@...nel.org>
To:     frank-w@...lic-files.de
Cc:     Frank Wunderlich <linux@...web.de>,
        linux-mediatek@...ts.infradead.org,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v1] arm64: dts: mt7986: add overlay for SATA power socket
 on BPI-R3

On Mon, Sep 11, 2023 at 3:11 PM Frank Wunderlich
<frank-w@...lic-files.de> wrote:
>
> Am 11. September 2023 21:51:42 MESZ schrieb Rob Herring <robh+dt@...nel.org>:
> >On Fri, Sep 1, 2023 at 2:27 AM Frank Wunderlich <linux@...web.de> wrote:
> >>
> >> From: Frank Wunderlich <frank-w@...lic-files.de>
> >>
> >> Bananapi R3 has a Power socket entended for using external SATA drives.
> >> This Socket is off by default but can be switched with gpio 8.
> >>
> >> Add an overlay to activate it.
> >>
> >> Signed-off-by: Frank Wunderlich <frank-w@...lic-files.de>
> >> ---
> >>  arch/arm64/boot/dts/mediatek/Makefile         |  1 +
> >>  .../mt7986a-bananapi-bpi-r3-sata.dtso         | 39 +++++++++++++++++++
> >>  2 files changed, 40 insertions(+)
> >>  create mode 100644 arch/arm64/boot/dts/mediatek/mt7986a-bananapi-bpi-r3-sata.dtso
> >>
> >> diff --git a/arch/arm64/boot/dts/mediatek/Makefile b/arch/arm64/boot/dts/mediatek/Makefile
> >> index c99c3372a4b5..822d3e36d3df 100644
> >> --- a/arch/arm64/boot/dts/mediatek/Makefile
> >> +++ b/arch/arm64/boot/dts/mediatek/Makefile
> >> @@ -13,6 +13,7 @@ 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
> >> +dtb-$(CONFIG_ARCH_MEDIATEK) += mt7986a-bananapi-bpi-r3-sata.dtbo
> >
> >The requirement for overlays is they have a target base dt in tree and
> >that you apply the overlay to it. All these existing overlays have the
> >same problem which I pointed out when you submitted them. Please fix
> >the existing ones before adding more.
> >
> >
> >Rob
>
> Hi Rob,
>
> i do not understand the problem as there is a target base dt...mt7986a-bananapi-bpi-r3.dtb.
>
> Do you mean that overlays should be merged with basedt at compiletime?

Yes, because we want to know an overlay can actually apply to what's upstream.

> We pack the base-dt and all overlays into one fit image and let uboot dynamically select the combination to apply. E.g. check if emmc is available, if yes apply emmc overlay else the sd one,same for nand/nor.

That's irrelevant.

Though do you really want to wait until that point to find out you
made some mistake in your overlay that it doesn't apply when you could
find out much sooner?

> Else i do not know *how* to fix as i don't see it as broken.

You need what I pointed out last time[1].

Rob

[1] https://lore.kernel.org/all/CAL_JsqK_3xxD0DFwipXO85P=q=EYjUdjE1_8g1MKtvw3vVzx5A@mail.gmail.com/