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SubjectRe: [RFC PATCH v2 06/11] dt-bindings: interrupt-controller: Add ACLINT MSWI and SSWI bindings
On Tue, Jul 13, 2021 at 12:52 AM Rob Herring <robh@kernel.org> wrote:
>
> On Fri, Jun 18, 2021 at 06:08:46PM +0530, Anup Patel wrote:
> > We add DT bindings documentation for the ACLINT MSWI and SSWI
> > devices found on RISC-V SOCs.
> >
> > Signed-off-by: Anup Patel <anup.patel@wdc.com>
> > Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
> > ---
> > .../riscv,aclint-swi.yaml | 82 +++++++++++++++++++
> > 1 file changed, 82 insertions(+)
> > create mode 100644 Documentation/devicetree/bindings/interrupt-controller/riscv,aclint-swi.yaml
> >
> > diff --git a/Documentation/devicetree/bindings/interrupt-controller/riscv,aclint-swi.yaml b/Documentation/devicetree/bindings/interrupt-controller/riscv,aclint-swi.yaml
> > new file mode 100644
> > index 000000000000..b74025542866
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/interrupt-controller/riscv,aclint-swi.yaml
> > @@ -0,0 +1,82 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/interrupt-controller/riscv,aclint-swi.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: RISC-V ACLINT Software Interrupt Devices
> > +
> > +maintainers:
> > + - Anup Patel <anup.patel@wdc.com>
> > +
> > +description:
> > + RISC-V SOCs include an implementation of the M-level software interrupt
> > + (MSWI) device and the S-level software interrupt (SSWI) device defined
> > + in the RISC-V Advanced Core Local Interruptor (ACLINT) specification.
> > +
> > + The ACLINT MSWI and SSWI devices are documented in the RISC-V ACLINT
> > + specification located at
> > + https://github.com/riscv/riscv-aclint/blob/main/riscv-aclint.adoc.
> > +
> > + The ACLINT MSWI and SSWI devices directly connect to the M-level and
> > + S-level software interrupt lines of various HARTs (or CPUs) respectively
> > + so the RISC-V per-HART (or per-CPU) local interrupt controller is the
> > + parent interrupt controller for the ACLINT MSWI and SSWI devices.
> > +
> > +allOf:
> > + - $ref: /schemas/interrupt-controller.yaml#
> > +
> > +properties:
> > + compatible:
> > + items:
> > + - enum:
> > + - riscv,aclint-mswi
> > + - riscv,aclint-sswi
> > +
> > + description:
> > + Should be "<vendor>,<chip>-aclint-mswi" and "riscv,aclint-mswi" OR
> > + "<vendor>,<chip>-aclint-sswi" and "riscv,aclint-sswi".
>
> The schema doesn't match the description.
>
> There's no actual vendor implementation yet? You could do:
>
> items:
> - {}
> - const: riscv,aclint-mswi
>
> But then your example will fail.

Is it okay to have optional vendor compatible string ?

Vendors can add their specific compatible string if there is some
special handling required. If there is not special handling required
then the two compatible strings are enough.

>
> > +
> > + reg:
> > + maxItems: 1
> > +
> > + "#interrupt-cells":
> > + const: 0
> > +
> > + interrupts-extended:
> > + minItems: 1
>
> You need maxItems too. I guess this based on number of cores, so just
> pick a 'should be enough' value.

There is a limit on the maximum number of connections between the
device and HARTs or CPUs so this will be the maxItems over here.

I will update this in the next patch revision.

>
> > +
> > + interrupt-controller: true
> > +
> > +additionalProperties: false
> > +
> > +required:
> > + - compatible
> > + - reg
> > + - interrupts-extended
> > + - interrupt-controller
> > + - "#interrupt-cells"
> > +
> > +examples:
> > + - |
> > + // Example 1 (RISC-V MSWI device used by Linux RISC-V NoMMU kernel):
> > +
> > + interrupt-controller@2000000 {
> > + compatible = "riscv,aclint-mswi";
> > + interrupts-extended = <&cpu1intc 3 &cpu2intc 3 &cpu3intc 3 &cpu4intc 3>;
>
> interrupts-extended = <&cpu1intc 3>, <&cpu2intc 3>, <&cpu3intc 3>, <&cpu4intc 3>;

Okay, will update.

>
> > + reg = <0x2000000 0x4000>;
> > + interrupt-controller;
> > + #interrupt-cells = <0>;
> > + };
> > +
> > + - |
> > + // Example 2 (RISC-V SSWI device used by Linux RISC-V MMU kernel):
> > +
> > + interrupt-controller@2100000 {
> > + compatible = "riscv,aclint-sswi";
> > + interrupts-extended = <&cpu1intc 1 &cpu2intc 1 &cpu3intc 1 &cpu4intc 1>;
>
> Same here.

Okay, will update here as well.

>
> > + reg = <0x2100000 0x4000>;
> > + interrupt-controller;
> > + #interrupt-cells = <0>;
> > + };
> > +...
> > --
> > 2.25.1
> >
> >

Regards,
Anup

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