linux-kernel - Re: [PATCH v3 07/10] riscv: boot: dts: r9a07g043: Add placeholder nodes

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Date:   Thu, 15 Sep 2022 23:26:37 +0100
From:   "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To:     Conor.Dooley@...rochip.com
Cc:     geert+renesas@...der.be, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, paul.walmsley@...ive.com,
        palmer@...belt.com, aou@...s.berkeley.edu, heiko@...ech.de,
        atishp@...osinc.com, devicetree@...r.kernel.org,
        linux-riscv@...ts.infradead.org, linux-renesas-soc@...r.kernel.org,
        linux-kernel@...r.kernel.org, biju.das.jz@...renesas.com,
        prabhakar.mahadev-lad.rj@...renesas.com
Subject: Re: [PATCH v3 07/10] riscv: boot: dts: r9a07g043: Add placeholder nodes

Hi Conor,

Thank you for the review.

On Thu, Sep 15, 2022 at 10:36 PM <Conor.Dooley@...rochip.com> wrote:
>
> On 15/09/2022 19:15, Prabhakar wrote:
> > riscv: boot: dts: r9a07g043: Add placeholder nodes
>
> nit: s/boot//
>
Will fix that.

> > EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> >
> > From: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> >
> > Add empty placeholder nodes to RZ/Five (R9A07G043) SoC DTSI.
>
> Can you explain why do you need placeholder nodes for this and
> cannot just directly include the other dtsis?
>
Since the RZ/G2UL SoC is ARM64 where it has a GIC and on RZ/Five SoC
we have PLIC for interrupts. Also the interrupt numbering for RZ/Five
SoC differs from RZ/G2UL SoC hence we are not directly using the
RZ/G2UL SoC DTSI [0].

[0] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/arm64/boot/dts/renesas/r9a07g043.dtsi?h=v6.0-rc5

For the RZ/Five SMARC EVK I am re-using the below files [1] (SoM) and
[2] (Carrier board) as the RZ/Five SMARC EVK is pin compatible.  Since
I am re-using these when trying to compile the RZ/Five DTB I get
compilation errors since the nodes dont exist (and there is no way
currently we can delete the node reference when the actual node itself
isn't present) hence these place holders.

[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/arm64/boot/dts/renesas/rzg2ul-smarc-som.dtsi?h=v6.0-rc5
[2] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/arm64/boot/dts/renesas/rzg2ul-smarc.dtsi?h=v6.0-rc5

Cheers,
Prabhakar