linux-kernel - Re: [PATCH v2 6/8] riscv: dts: renesas: Add minimal DTS for Renesas RZ/Five SMARC EVK

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Date:   Fri, 19 Aug 2022 12:39:40 +0100
From:   "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Conor Dooley <Conor.Dooley@...rochip.com>,
        "Lad, Prabhakar" <prabhakar.mahadev-lad.rj@...renesas.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Anup Patel <anup@...infault.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Biju Das <biju.das.jz@...renesas.com>
Subject: Re: [PATCH v2 6/8] riscv: dts: renesas: Add minimal DTS for Renesas
 RZ/Five SMARC EVK

Hi Geert,


On Fri, Aug 19, 2022 at 9:25 AM Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
>
> Hi Prabhakar,
>
> On Mon, Aug 15, 2022 at 10:16 PM Lad, Prabhakar
> <prabhakar.csengg@...il.com> wrote:
> > On Mon, Aug 15, 2022 at 8:00 PM <Conor.Dooley@...rochip.com> wrote:
> > > On 15/08/2022 16:14, Lad Prabhakar wrote:
> > > > EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> > > >
> > > > Enable the minimal blocks required for booting the Renesas RZ/Five
> > > > SMARC EVK with initramfs.
> > > >
> > > > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> > > > ---
> > > > v1->v2
> > > > * New patch
> > > > ---
> > > >  arch/riscv/boot/dts/Makefile                  |  1 +
> > > >  arch/riscv/boot/dts/renesas/Makefile          |  2 ++
> > > >  .../boot/dts/renesas/r9a07g043f01-smarc.dts   | 16 ++++++++++
> > > >  .../boot/dts/renesas/rzfive-smarc-som.dtsi    | 22 +++++++++++++
> > > >  arch/riscv/boot/dts/renesas/rzfive-smarc.dtsi | 32 +++++++++++++++++++
> > > >  5 files changed, 73 insertions(+)
> > > >  create mode 100644 arch/riscv/boot/dts/renesas/Makefile
> > > >  create mode 100644 arch/riscv/boot/dts/renesas/r9a07g043f01-smarc.dts
> > > >  create mode 100644 arch/riscv/boot/dts/renesas/rzfive-smarc-som.dtsi
> > >
> > > Just to sort out some of my own confusion here - is the smarc EVK
> > > shared between your arm boards and the riscv ones? Or just the
> > > peripherals etc on the soc?
> > >
> > RZ/Five SoC is pin compatible with RZ/G2UL Type 1 SoC (ARM64). RZ/G2UL
> > SMARC EVK carrier board can be swapped with RZ/Five or RZ/G2UL SMARC
> > SoM and still be used.
> >
> > > If it is the forver, does the approach suggested here for the
> > > allwinner stuff make sense to also use for risc-v stuff with
> > > shared parts of devicetrees?
> > > https://lore.kernel.org/linux-riscv/3cd9ed5b-8348-38ac-feb1-9a7da858cebc@microchip.com/
> > >
> > it does make sense. But I wonder where we would place the common
> > shared dtsi that can be used by two arch's.
>
> You can keep it under arch/arm/boot/dts/renesas/, and refer to
> it from riscv as <arm64/renesas/...>.
> Cfr. the symlinks under scripts/dtc/include-prefixes/arm64/ and
> e.g. cros-ec-keyboard.dtsi.
>
Thanks for the pointer.

Cheers,
Prabhakar