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Date: Fri, 17 May 2024 17:04:41 +0100
From: Conor Dooley <conor@...nel.org>
To: Kanak Shilledar <kanakshilledar@...il.com>
Cc: Kanak Shilledar <kanakshilledar111@...tonmail.com>,
Thomas Gleixner <tglx@...utronix.de>, Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Conor Dooley <conor+dt@...nel.org>,
Paul Walmsley <paul.walmsley@...ive.com>,
Palmer Dabbelt <palmer@...belt.com>,
Albert Ou <aou@...s.berkeley.edu>,
Samuel Holland <samuel.holland@...ive.com>,
linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
linux-riscv@...ts.infradead.org
Subject: Re: [PATCH] dt-bindings: interrupt-controller: riscv,cpu-intc:
convert to dtschema
Yo,
On Fri, May 17, 2024 at 08:37:40PM +0530, Kanak Shilledar wrote:
> Convert the RISC-V Hart-Level Interrupt Controller (HLIC) to newer
> DT schema, Created DT schema based on the .txt file which had
> `compatible`, `#interrupt-cells` and `interrupt-controller` as
> required properties.
> Changes made with respect to original file:
> - Changed the example to just use interrupt-controller instead of
> using the whole cpu block
> - Changed the example compatible string.
>
> Signed-off-by: Kanak Shilledar <kanakshilledar111@...tonmail.com>
> ---
> .../interrupt-controller/riscv,cpu-intc.txt | 52 -----------------
> .../interrupt-controller/riscv,cpu-intc.yaml | 57 +++++++++++++++++++
> 2 files changed, 57 insertions(+), 52 deletions(-)
> delete mode 100644 Documentation/devicetree/bindings/interrupt-controller/riscv,cpu-intc.txt
> create mode 100644 Documentation/devicetree/bindings/interrupt-controller/riscv,cpu-intc.yaml
>
> diff --git a/Documentation/devicetree/bindings/interrupt-controller/riscv,cpu-intc.txt b/Documentation/devicetree/bindings/interrupt-controller/riscv,cpu-intc.txt
> deleted file mode 100644
> index 265b223cd978..000000000000
> --- a/Documentation/devicetree/bindings/interrupt-controller/riscv,cpu-intc.txt
> +++ /dev/null
> @@ -1,52 +0,0 @@
> -RISC-V Hart-Level Interrupt Controller (HLIC)
> ----------------------------------------------
> -
> -RISC-V cores include Control Status Registers (CSRs) which are local to each
> -CPU core (HART in RISC-V terminology) and can be read or written by software.
> -Some of these CSRs are used to control local interrupts connected to the core.
> -Every interrupt is ultimately routed through a hart's HLIC before it
> -interrupts that hart.
> -
> -The RISC-V supervisor ISA manual specifies three interrupt sources that are
> -attached to every HLIC: software interrupts, the timer interrupt, and external
> -interrupts. Software interrupts are used to send IPIs between cores. The
> -timer interrupt comes from an architecturally mandated real-time timer that is
> -controlled via Supervisor Binary Interface (SBI) calls and CSR reads. External
> -interrupts connect all other device interrupts to the HLIC, which are routed
> -via the platform-level interrupt controller (PLIC).
> -
> -All RISC-V systems that conform to the supervisor ISA specification are
> -required to have a HLIC with these three interrupt sources present. Since the
> -interrupt map is defined by the ISA it's not listed in the HLIC's device tree
> -entry, though external interrupt controllers (like the PLIC, for example) will
> -need to define how their interrupts map to the relevant HLICs. This means
> -a PLIC interrupt property will typically list the HLICs for all present HARTs
> -in the system.
> -
> -Required properties:
> -- compatible : "riscv,cpu-intc"
> -- #interrupt-cells : should be <1>. The interrupt sources are defined by the
> - RISC-V supervisor ISA manual, with only the following three interrupts being
> - defined for supervisor mode:
> - - Source 1 is the supervisor software interrupt, which can be sent by an SBI
> - call and is reserved for use by software.
> - - Source 5 is the supervisor timer interrupt, which can be configured by
> - SBI calls and implements a one-shot timer.
> - - Source 9 is the supervisor external interrupt, which chains to all other
> - device interrupts.
I don't think that we should remove this test from the binding.
> -- interrupt-controller : Identifies the node as an interrupt controller
> -
> -Furthermore, this interrupt-controller MUST be embedded inside the cpu
> -definition of the hart whose CSRs control these local interrupts.
> -
> -An example device tree entry for a HLIC is show below.
> -
> - cpu1: cpu@1 {
> - compatible = "riscv";
> - ...
> - cpu1-intc: interrupt-controller {
> - #interrupt-cells = <1>;
> - compatible = "sifive,fu540-c000-cpu-intc", "riscv,cpu-intc";
> - interrupt-controller;
> - };
> - };
> diff --git a/Documentation/devicetree/bindings/interrupt-controller/riscv,cpu-intc.yaml b/Documentation/devicetree/bindings/interrupt-controller/riscv,cpu-intc.yaml
> new file mode 100644
> index 000000000000..6fe86d243633
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/interrupt-controller/riscv,cpu-intc.yaml
> @@ -0,0 +1,57 @@
> +# SPDX-License-Identifier: GPL-2.0 OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/interrupt-controller/riscv,cpu-intc.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: RISC-V Hart-Level Interrupt Controller (HLIC)
> +
> +description:
> + RISC-V cores include Control Status Registers (CSRs) which are local to
> + each CPU core (HART in RISC-V terminology) and can be read or written by
> + software. Some of these CSRs are used to control local interrupts connected
> + to the core. Every interrupt is ultimately routed through a hart's HLIC
> + before it interrupts that hart.
> +
> + The RISC-V supervisor ISA manual specifies three interrupt sources that are
> + attached to every HLIC namely software interrupts, the timer interrupt, and
> + external interrupts. Software interrupts are used to send IPIs between
> + cores. The timer interrupt comes from an architecturally mandated real-
> + time timer that is controlled via Supervisor Binary Interface (SBI) calls
> + and CSR reads. External interrupts connect all other device interrupts to
> + the HLIC, which are routed via the platform-level interrupt controller
> + (PLIC).
> +
> + All RISC-V systems that conform to the supervisor ISA specification are
> + required to have a HLIC with these three interrupt sources present. Since
> + the interrupt map is defined by the ISA it's not listed in the HLIC's device
> + tree entry, though external interrupt controllers (like the PLIC, for
> + example) will need to define how their interrupts map to the relevant HLICs.
> + This means a PLIC interrupt property will typically list the HLICs for all
> + present HARTs in the system.
> +
> +maintainers:
> + - Kanak Shilledar <kanakshilledar111@...tonmail.com>
Are you knowledgeable about the cpu-intc on RISC-V? If you put yourself
down just to satisfy dt_binding_check, I would suggest that you put down
Palmer and Paul here as the maintainers of the architecture instead.
> +properties:
> + compatible:
> + const: "riscv,cpu-intc"
A new warning with dtbs_check from your patch:
/stuff/linux/build/arch/riscv/boot/dts/renesas/r9a07g043f01-smarc.dtb: interrupt-controller: compatible:0: 'riscv,cpu-intc' was expected
from schema $id: http://devicetree.org/schemas/interrupt-controller/riscv,cpu-intc.yaml#
/stuff/linux/build/arch/riscv/boot/dts/renesas/r9a07g043f01-smarc.dtb: interrupt-controller: compatible: ['andestech,cpu-intc', 'riscv,cpu-intc'] is too long
from schema $id: http://devicetree.org/schemas/interrupt-controller/riscv,cpu-intc.yaml#
There's a duplicate description in riscv/cpus.yaml:
interrupt-controller:
type: object
additionalProperties: false
description: Describes the CPU's local interrupt controller
properties:
'#interrupt-cells':
const: 1
compatible:
oneOf:
- items:
- const: andestech,cpu-intc
- const: riscv,cpu-intc
- const: riscv,cpu-intc
interrupt-controller: true
I think the one in cpus.yaml should be converted to a ref and the
andestech compatible added here.
> + interrupt-controller: true
> +
> + '#interrupt-cells': true
`const: 1` to match the text binding being removed.
Cheers,
Conor.
> +
> +required:
> + - compatible
> + - '#interrupt-cells'
> + - interrupt-controller
> +
> +additionalProperties: false
> +
> +examples:
> + - |
> + interrupt-controller {
> + #interrupt-cells = <1>;
> + compatible = "riscv,cpu-intc";
> + interrupt-controller;
> + };
> --
> 2.34.1
>
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