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

From: "Lad, Prabhakar" <prabhakar.csengg@gmail.com>
To: Conor Dooley <conor@kernel.org>
Cc: Guo Ren <guoren@kernel.org>,
	Paul Walmsley <paul.walmsley@sifive.com>,
	 Palmer Dabbelt <palmer@dabbelt.com>,
	Albert Ou <aou@eecs.berkeley.edu>,
	 Geert Uytterhoeven <geert+renesas@glider.be>,
	Magnus Damm <magnus.damm@gmail.com>,
	 Rob Herring <robh+dt@kernel.org>,
	 Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
	Heiko Stuebner <heiko@sntech.de>,
	 Conor Dooley <conor.dooley@microchip.com>,
	Anup Patel <anup@brainfault.org>,
	 Atish Patra <atishp@rivosinc.com>,
	 Heinrich Schuchardt <heinrich.schuchardt@canonical.com>,
	devicetree@vger.kernel.org,  linux-riscv@lists.infradead.org,
	linux-kernel@vger.kernel.org,  linux-renesas-soc@vger.kernel.org,
	Biju Das <biju.das.jz@bp.renesas.com>,
	 Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Subject: Re: [PATCH v5 4/7] riscv: dts: renesas: Add initial devicetree for Renesas RZ/Five SoC
Date: Sun, 30 Oct 2022 22:27:17 +0000	[thread overview]
Message-ID: <CA+V-a8vCNx-bqjeOa13LewaEJOGW-0ypqJTvZo7om6XcM4T7UA@mail.gmail.com> (raw)
In-Reply-To: <Y16/YQTOW3DuQvo9@spud>

Hi Conor,

On Sun, Oct 30, 2022 at 6:16 PM Conor Dooley <conor@kernel.org> wrote:
>
> On Sun, Oct 30, 2022 at 08:02:10AM +0800, Guo Ren wrote:
> > On Sun, Oct 30, 2022 at 3:11 AM Lad, Prabhakar
> > <prabhakar.csengg@gmail.com> wrote:
> > >
> > > Hi Guo,
> > >
> > > Thank you for the review.
> > >
> > > On Sat, Oct 29, 2022 at 5:25 AM Guo Ren <guoren@kernel.org> wrote:
> > > >
> > > > On Sat, Oct 29, 2022 at 12:59 AM Prabhakar <prabhakar.csengg@gmail.com> wrote:
> > > > >
> > > > > From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.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@bp.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>
> > > > 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>;
>
> The makefile for this directory is not added until the next patch right?
> The compile shouldn't be broken here since it therefore cannot be
> compiled?
>
These nodes are already present in the kernel [0]  so the makefile
change in the next patch if made here still won't break the
compilation alone of SoC DTSI (included in dts).

[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#n563

Cheers,
Prabhakar

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