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

Guo Ren
2022-10-30T00:02:28Z

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>;

>
> [0] arch/arm64/boot/dts/renesas/r9a07g043.dtsi
> [1] https://patchwork.kernel.org/project/linux-renesas-soc/cover/20221025220629.79321-1-prabhakar.mahadev-lad.rj@bp.renesas.com/
>
> > > +
> > > +/ {
> > > + cpus {
> > > + #address-cells = <1>;
> > > + #size-cells = <0>;
> > > + timebase-frequency = <12000000>;
> > > +
> > > + cpu0: cpu@0 {
> > > + compatible = "andestech,ax45mp", "riscv";
> > > + device_type = "cpu";
> > > + reg = <0x0>;
> > > + status = "okay";
> > > + riscv,isa = "rv64imafdc";
> > > + mmu-type = "riscv,sv39";
> > > + i-cache-size = <0x8000>;
> > > + i-cache-line-size = <0x40>;
> > > + d-cache-size = <0x8000>;
> > > + d-cache-line-size = <0x40>;
> > > + clocks = <&cpg CPG_CORE R9A07G043_CLK_I>;
> > > +
> > > + cpu0_intc: interrupt-controller {
> > > + #interrupt-cells = <1>;
> > > + compatible = "riscv,cpu-intc";
> > > + interrupt-controller;
> > > + };
> > > + };
> > > + };
> > > +};
> > > +
> > > +&soc {
> > > + interrupt-parent = <&plic>;
> > > +
> > > + plic: interrupt-controller@12c00000 {
> > > + compatible = "renesas,r9a07g043-plic", "andestech,nceplic100";
> > > + #interrupt-cells = <2>;
> > > + #address-cells = <0>;
> > > + riscv,ndev = <511>;
> > > + interrupt-controller;
> > > + reg = <0x0 0x12c00000 0 0x400000>;
> > > + clocks = <&cpg CPG_MOD R9A07G043_NCEPLIC_ACLK>;
> > > + power-domains = <&cpg>;
> > > + resets = <&cpg R9A07G043_NCEPLIC_ARESETN>;
> > Ditto, Where is cpg? in r9a07g043.dtsi?
> >
> Yes CPG node is in r9a07g043.dtsi.
>
> Cheers,
> Prabhakar

--
Best Regards
Guo Ren