Re: [PATCH 01/13] dt-bindings: interrupt-controller: create a header for RISC-V interrupts

From: Anup Patel <anup@brainfault.org>
To: "Heiko Stübner" <heiko@sntech.de>
Cc: Linus Walleij <linus.walleij@linaro.org>,
	bgolaszewski@baylibre.com, Rob Herring <robh+dt@kernel.org>,
	jassisinghbrar@gmail.com,
	Paul Walmsley <paul.walmsley@sifive.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Albert Ou <aou@eecs.berkeley.edu>,
	a.zummo@towertech.it, alexandre.belloni@bootlin.com,
	broonie@kernel.org,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	lewis.hanly@microchip.com, conor.dooley@microchip.com,
	Daire McNamara <daire.mcnamara@microchip.com>,
	Atish Patra <atish.patra@wdc.com>,
	ivan.griffin@microchip.com, linux-gpio@vger.kernel.org,
	DTML <devicetree@vger.kernel.org>,
	"linux-kernel@vger.kernel.org List"
	<linux-kernel@vger.kernel.org>,
	linux-i2c@vger.kernel.org,
	linux-riscv <linux-riscv@lists.infradead.org>,
	linux-crypto@vger.kernel.org, linux-rtc@vger.kernel.org,
	linux-spi@vger.kernel.org, linux-usb@vger.kernel.org,
	krzysztof.kozlowski@canonical.com,
	Geert Uytterhoeven <geert@linux-m68k.org>,
	Bin Meng <bin.meng@windriver.com>
Subject: Re: [PATCH 01/13] dt-bindings: interrupt-controller: create a header for RISC-V interrupts
Date: Tue, 23 Nov 2021 17:05:38 +0530	[thread overview]
Message-ID: <CAAhSdy2yr+a7=7Crk7s3pAVbVcYjTdOtRfAaQXBkTVsUpfG20g@mail.gmail.com> (raw)
In-Reply-To: <272946671.hFph3VMliC@diego>

On Tue, Nov 23, 2021 at 4:38 PM Heiko Stübner <heiko@sntech.de> wrote:
>
> Am Montag, 8. November 2021, 16:05:42 CET schrieb conor.dooley@microchip.com:
> > From: Ivan Griffin <ivan.griffin@microchip.com>
> >
> > Provide named identifiers for device tree for RISC-V interrupts.
> >
> > Licensed under GPL and MIT, as this file may be useful to any OS that
> > uses device tree.
> >
> > Signed-off-by: Ivan Griffin <ivan.griffin@microchip.com>
> > Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
> > ---
> >  .../interrupt-controller/riscv-hart.h         | 19 +++++++++++++++++++
> >  1 file changed, 19 insertions(+)
> >  create mode 100644 include/dt-bindings/interrupt-controller/riscv-hart.h
> >
> > diff --git a/include/dt-bindings/interrupt-controller/riscv-hart.h b/include/dt-bindings/interrupt-controller/riscv-hart.h
> > new file mode 100644
> > index 000000000000..e1c32f6090ac
> > --- /dev/null
> > +++ b/include/dt-bindings/interrupt-controller/riscv-hart.h
> > @@ -0,0 +1,19 @@
> > +/* SPDX-License-Identifier: (GPL-2.0 OR MIT) */
> > +/*
> > + * Copyright (C) 2021 Microchip Technology Inc.  All rights reserved.
> > + */
> > +
> > +#ifndef _DT_BINDINGS_INTERRUPT_CONTROLLER_RISCV_HART_H
> > +#define _DT_BINDINGS_INTERRUPT_CONTROLLER_RISCV_HART_H
> > +
> > +#define HART_INT_U_SOFT   0
> > +#define HART_INT_S_SOFT   1
> > +#define HART_INT_M_SOFT   3
> > +#define HART_INT_U_TIMER  4
> > +#define HART_INT_S_TIMER  5
> > +#define HART_INT_M_TIMER  7
> > +#define HART_INT_U_EXT    8
> > +#define HART_INT_S_EXT    9
> > +#define HART_INT_M_EXT    11
>
> (1) From checking clic doc [0] I see an additional
>         12   CLIC software interrupt
> defined.

Local IRQ #12 is for S-mode guest external interrupts as-per
the ratified H-extension specification.

I guess CLIC spec needs to be updated.

Regards,
Anup

>
> (2) The doc states that the ordering is a recommendation and
>         "not mandatory in all incarnations of the CLIC"
> Is that clarified somewhere else that this more than recommended?
>
> Thanks
> Heiko
>
>
> [0] https://github.com/riscv/riscv-fast-interrupt/blob/master/clic.adoc
>
> > +
> > +#endif /* _DT_BINDINGS_INTERRUPT_CONTROLLER_RISCV_HART_H */
> >
>
>
>
>