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

Geert Uytterhoeven
2022-08-19T08:31:47Z

Hi Prabhakar,

On Mon, Aug 15, 2022 at 10:16 PM Lad, Prabhakar
<prabhakar.csengg@gmail.com> wrote:
> On Mon, Aug 15, 2022 at 8:00 PM <Conor.Dooley@microchip.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@bp.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.

Gr{oetje,eeting}s,

Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds