linux-kernel - Re: [PATCH v5 4/7] riscv: dts: renesas: Add initial devicetree for Renesas RZ/Five SoC

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Date:   Sun, 30 Oct 2022 22:23:48 +0000
From:   "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To:     Guo Ren <guoren@...nel.org>
Cc:     Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Magnus Damm <magnus.damm@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Heiko Stuebner <heiko@...ech.de>,
        Conor Dooley <conor.dooley@...rochip.com>,
        Anup Patel <anup@...infault.org>,
        Atish Patra <atishp@...osinc.com>,
        Heinrich Schuchardt <heinrich.schuchardt@...onical.com>,
        devicetree@...r.kernel.org, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        Biju Das <biju.das.jz@...renesas.com>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: Re: [PATCH v5 4/7] riscv: dts: renesas: Add initial devicetree for
 Renesas RZ/Five SoC

Hi Guo,

On Sun, Oct 30, 2022 at 1:02 AM Guo Ren <guoren@...nel.org> wrote:
>
> On Sun, Oct 30, 2022 at 3:11 AM Lad, Prabhakar
> <prabhakar.csengg@...il.com> wrote:
> >
> > Hi Guo,
> >
> > Thank you for the review.
> >
> > On Sat, Oct 29, 2022 at 5:25 AM Guo Ren <guoren@...nel.org> wrote:
> > >
> > > On Sat, Oct 29, 2022 at 12:59 AM Prabhakar <prabhakar.csengg@...il.com> wrote:
> > > >
> > > > From: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> > > >
> > > > Add initial device tree for Renesas RZ/Five RISC-V CPU Core (AX45MP
> > > > Single).
> > > >
> > > > RZ/Five SoC is almost identical to RZ/G2UL Type-1 SoC (ARM64) hence we
> > > > will be reusing r9a07g043.dtsi [0] as a base DTSI for both the SoC's.
> > > > r9a07g043f.dtsi includes RZ/Five SoC specific blocks.
> > > >
> > > > Below are the RZ/Five SoC specific blocks added in the initial DTSI which
> > > > can be used to boot via initramfs on RZ/Five SMARC EVK:
> > > > - AX45MP CPU
> > > > - PLIC
> > > >
> > > > [0] arch/arm64/boot/dts/renesas/r9a07g043.dtsi
> > > >
> > > > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> > > > ---
> > > > v4 -> v5
> > > > * Fixed riscv,ndev value (should be 511)
> > > > * Reworked completely (sort of new patch)
> > > >
> > > > v3 -> v4
> > > > * No change
> > > >
> > > > v2 -> v3
> > > > * Fixed clock entry for CPU core
> > > > * Fixed timebase frequency to 12MHz
> > > > * Fixed sorting of the nodes
> > > > * Included RB tags
> > > >
> > > > v1 -> v2
> > > > * Dropped including makefile change
> > > > * Updated ndev count
> > > > ---
> > > >  arch/riscv/boot/dts/renesas/r9a07g043f.dtsi | 57 +++++++++++++++++++++
> > > >  1 file changed, 57 insertions(+)
> > > >  create mode 100644 arch/riscv/boot/dts/renesas/r9a07g043f.dtsi
> > > >
> > > > diff --git a/arch/riscv/boot/dts/renesas/r9a07g043f.dtsi b/arch/riscv/boot/dts/renesas/r9a07g043f.dtsi
> > > > new file mode 100644
> > > > index 000000000000..50134be548f5
> > > > --- /dev/null
> > > > +++ b/arch/riscv/boot/dts/renesas/r9a07g043f.dtsi
> > > > @@ -0,0 +1,57 @@
> > > > +// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > > > +/*
> > > > + * Device Tree Source for the RZ/Five SoC
> > > > + *
> > > > + * Copyright (C) 2022 Renesas Electronics Corp.
> > > > + */
> > > > +
> > > > +#include <dt-bindings/interrupt-controller/irq.h>
> > > > +
> > > > +#define SOC_PERIPHERAL_IRQ(nr) (nr + 32)
> > > > +
> > > > +#include <arm64/renesas/r9a07g043.dtsi>
^^^ look below...

> > > The initial patch shouldn't be broken. Combine them together with the
> > > minimal components and add others late. Don't separate the DTS files.
> > >
> > r9a07g043.dtsi [0] already exists in the kernel. r9a07g043.dtsi is
> > shared with the RZ/G2UL SoC (ARM64) and the RZ/Five SoC. There are two
> > more patches [1] which are required and are currently queued up in the
> > Renesas tree for v6.2 (Ive mentioned the dependencies in the cover
> > letter).
>
> You could just move the below part to the second dtsi patch. Then
> compile won't be broken.
>
>             clocks = <&cpg CPG_MOD R9A07G043_NCEPLIC_ACLK>;
>             power-domains = <&cpg>;
>             resets = <&cpg R9A07G043_NCEPLIC_ARESETN>;
>
Compile won't break at all, the CPG node [0] and the pinctrl node [1]
already exists in the kernel which is being re-used by this SoC DTSI.

... the include file above already exists in the kernel and is not
part of the next follow up patch.

[0] https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/tree/arch/arm64/boot/dts/renesas/r9a07g043.dtsi?h=next-20221028#n541
[1] https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/tree/arch/arm64/boot/dts/renesas/r9a07g043.dtsi?h=next-20221028#n563

Cheers,
Prabhakar