From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>

Hi All,

This patch series aims to split up the RZ/G2UL SoC DTSI into common parts
so that this can be shared with the RZ/Five SoC.

Implementation is based on the discussion [0] where I have used option#2.

The Renesas RZ/G2UL (ARM64) and RZ/Five (RISC-V) have almost the same
identical blocks to avoid duplication a base SoC dtsi (r9a07g043.dtsi) is
created which will be used by the RZ/G2UL (r9a07g043u.dtsi) and RZ/Five
(r9a07g043F.dtsi)

Sending this as an RFC to get some feedback.

r9a07g043f.dtsi will look something like below:

#include <dt-bindings/interrupt-controller/irq.h>

#define SOC_PERIPHERAL_IRQ_NUMBER(nr)	(nr + 32)
#define SOC_PERIPHERAL_IRQ(nr, na)	SOC_PERIPHERAL_IRQ_NUMBER(nr) na

#include <arm64/renesas/r9a07g043.dtsi>

/ {
   ...
   ...   
};

Although patch#2 can be merged into patch#1 just wanted to keep them separated
for easier review.

RFC-> RESEND RFC
* Patches rebased on [1]

RFC: [2]

[0] https://lore.kernel.org/linux-arm-kernel/Yyt8s5+pyoysVNeC@spud/T/
[1] https://patchwork.kernel.org/project/linux-renesas-soc/cover/20221009230044.10961-1-prabhakar.mahadev-lad.rj@bp.renesas.com/
[2] https://patchwork.kernel.org/project/linux-renesas-soc/cover/20220929172356.301342-1-prabhakar.mahadev-lad.rj@bp.renesas.com/

Cheers,
Prabhakar

Lad Prabhakar (2):
  arm64: dts: renesas: r9a07g043: Introduce SOC_PERIPHERAL_IRQ() macro
    to specify interrupt property
  arm64: dts: renesas: r9a07g043: Split out RZ/G2UL SoC specific parts

 arch/arm64/boot/dts/renesas/r9a07g043.dtsi    | 347 ++++++++----------
 arch/arm64/boot/dts/renesas/r9a07g043u.dtsi   |  72 ++++
 .../boot/dts/renesas/r9a07g043u11-smarc.dts   |   2 +-
 3 files changed, 220 insertions(+), 201 deletions(-)
 create mode 100644 arch/arm64/boot/dts/renesas/r9a07g043u.dtsi

-- 
2.25.1

Hi Prabhakar,

(now replying to the latest version)

On Mon, Oct 17, 2022 at 11:12 AM Prabhakar <prabhakar.csengg@gmail.com> wrote:
> This patch series aims to split up the RZ/G2UL SoC DTSI into common parts
> so that this can be shared with the RZ/Five SoC.
>
> Implementation is based on the discussion [0] where I have used option#2.
>
> The Renesas RZ/G2UL (ARM64) and RZ/Five (RISC-V) have almost the same
> identical blocks to avoid duplication a base SoC dtsi (r9a07g043.dtsi) is
> created which will be used by the RZ/G2UL (r9a07g043u.dtsi) and RZ/Five
> (r9a07g043F.dtsi)

Thanks for your series!

> Sending this as an RFC to get some feedback.
>
> r9a07g043f.dtsi will look something like below:
>
> #include <dt-bindings/interrupt-controller/irq.h>
>
> #define SOC_PERIPHERAL_IRQ_NUMBER(nr)   (nr + 32)
> #define SOC_PERIPHERAL_IRQ(nr, na)      SOC_PERIPHERAL_IRQ_NUMBER(nr) na

Originally, when I assumed incorrectly that dtc does not support
arithmetic, I used "nr" and "na" in the macro I proposed to mean RISC-V
("r") resp. ARM ("a") interrupt number.  Apparently the names stuck,
although the second parameter now has a completely different meaning ;-)

However, as the NCEPLIC does support interrupt flags, unlike the SiFive
PLIC, there is no need to have the flags parameter in the macro.

Moreover,  it looks like the SOC_PERIPHERAL_IRQ_NUMBER()
intermediate is not needed, so you can just write:

    #define SOC_PERIPHERAL_IRQ(nr)  (nr + 32)

> #include <arm64/renesas/r9a07g043.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

Hi Geert.

Thank you for the review.

On Tue, Oct 25, 2022 at 1:42 PM Geert Uytterhoeven <geert@linux-m68k.org> wrote:
>
> Hi Prabhakar,
>
> (now replying to the latest version)
>
> On Mon, Oct 17, 2022 at 11:12 AM Prabhakar <prabhakar.csengg@gmail.com> wrote:
> > This patch series aims to split up the RZ/G2UL SoC DTSI into common parts
> > so that this can be shared with the RZ/Five SoC.
> >
> > Implementation is based on the discussion [0] where I have used option#2.
> >
> > The Renesas RZ/G2UL (ARM64) and RZ/Five (RISC-V) have almost the same
> > identical blocks to avoid duplication a base SoC dtsi (r9a07g043.dtsi) is
> > created which will be used by the RZ/G2UL (r9a07g043u.dtsi) and RZ/Five
> > (r9a07g043F.dtsi)
>
> Thanks for your series!
>
> > Sending this as an RFC to get some feedback.
> >
> > r9a07g043f.dtsi will look something like below:
> >
> > #include <dt-bindings/interrupt-controller/irq.h>
> >
> > #define SOC_PERIPHERAL_IRQ_NUMBER(nr)   (nr + 32)
> > #define SOC_PERIPHERAL_IRQ(nr, na)      SOC_PERIPHERAL_IRQ_NUMBER(nr) na
>
> Originally, when I assumed incorrectly that dtc does not support
> arithmetic, I used "nr" and "na" in the macro I proposed to mean RISC-V
> ("r") resp. ARM ("a") interrupt number.  Apparently the names stuck,
> although the second parameter now has a completely different meaning ;-)
>
> However, as the NCEPLIC does support interrupt flags, unlike the SiFive
> PLIC, there is no need to have the flags parameter in the macro.
>
> Moreover,  it looks like the SOC_PERIPHERAL_IRQ_NUMBER()
> intermediate is not needed, so you can just write:
>
>     #define SOC_PERIPHERAL_IRQ(nr)  (nr + 32)
>
Agreed, I'll change it as per your suggestion and send a v2.

Cheers,
Prabhakar