linux-kernel - Re: [RFC PATCH v4 00/20] RISC-V: ACPI: Add external interrupt controller support

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Date: Mon, 29 Apr 2024 12:11:00 +0530
From: Sunil V L <sunilvl@...tanamicro.com>
To: Björn Töpel <bjorn@...nel.org>
Cc: "Rafael J. Wysocki" <rafael@...nel.org>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-riscv@...ts.infradead.org, linux-acpi@...r.kernel.org,
	linux-pci@...r.kernel.org, acpica-devel@...ts.linux.dev,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>, Len Brown <lenb@...nel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Anup Patel <anup@...infault.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Samuel Holland <samuel.holland@...ive.com>,
	Robert Moore <robert.moore@...el.com>,
	Haibo1 Xu <haibo1.xu@...el.com>,
	Conor Dooley <conor.dooley@...rochip.com>,
	Andrew Jones <ajones@...tanamicro.com>,
	Atish Kumar Patra <atishp@...osinc.com>,
	Andrei Warkentin <andrei.warkentin@...el.com>,
	Marc Zyngier <maz@...nel.org>
Subject: Re: [RFC PATCH v4 00/20] RISC-V: ACPI: Add external interrupt
 controller support

On Wed, Apr 24, 2024 at 07:55:50PM +0200, Björn Töpel wrote:
> "Rafael J. Wysocki" <rafael@...nel.org> writes:
> 
> > On Mon, Apr 15, 2024 at 7:01 PM Sunil V L <sunilvl@...tanamicro.com> wrote:
> >>
> >> This series adds support for the below ECR approved by ASWG.
> >> 1) MADT - https://drive.google.com/file/d/1oMGPyOD58JaPgMl1pKasT-VKsIKia7zR/view?usp=sharing
> >>
> >> The series primarily enables irqchip drivers for RISC-V ACPI based
> >> platforms.
> >>
> >> The series can be broadly categorized like below.
> >>
> >> 1) PCI ACPI related functions are migrated from arm64 to common file so
> >> that we don't need to duplicate them for RISC-V.
> >>
> >> 2) Added support for re-ordering the probe of interrupt controllers when
> >> IRQCHIP_ACPI_DECLARE is used.
> >>
> >> 3) To ensure probe order between interrupt controllers and devices,
> >> implicit dependency is created similar to when _DEP is present.
> >>
> >> 4) When PNP devices like Generic 16550A UART, have the dependency on the
> >> interrupt controller, they will not be added to PNP data structures. So,
> >> added second phase of pnpacpi_init to handle this.
> >>
> >> 5) ACPI support added in RISC-V interrupt controller drivers.
> >>
> >> This series is still kept as RFC to seek feedback on above design
> >> changes. Looking forward for the feedback!
> >
> > I've looked at the patches and I don't see anything deeply concerning
> > in them from the ACPI core code perspective.
> >
> > The changes look reasonably straightforward to me.
> 
> Sunil, given Rafael's input, it sounds like it's time for a patch
> proper. This is really the missing piece to make ACPI usable on RISC-V!
> 
> Thanks for the nice work!
> Björn
> 
> FWIW,
> Tested-by: Björn Töpel <bjorn@...osinc.com>
> 
Sorry for the delayed response. I was AFK last week.

Many thanks!!, Rafael. Let me send next version without RFC.

Thank you very much Björn for testing it.

Thanks,
Sunil