linux-kernel - Re: [RFC v7 2/6] dt-bindings: interrupt-controller: document PolarFire SoC's gpio interrupt mux

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Message-ID: <3f732acc-6ed0-45f0-a2d6-ed8506b0fd6f@kernel.org>
Date: Wed, 24 Jul 2024 15:27:21 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Conor Dooley <conor.dooley@...rochip.com>, linux-kernel@...r.kernel.org
Cc: conor@...nel.org, Marc Zyngier <maz@...nel.org>,
 Daire McNamara <daire.mcnamara@...rochip.com>,
 Linus Walleij <linus.walleij@...aro.org>, Bartosz Golaszewski
 <brgl@...ev.pl>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Thomas Gleixner <tglx@...utronix.de>,
 Paul Walmsley <paul.walmsley@...ive.com>, Palmer Dabbelt
 <palmer@...belt.com>, linux-riscv@...ts.infradead.org,
 linux-gpio@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [RFC v7 2/6] dt-bindings: interrupt-controller: document
 PolarFire SoC's gpio interrupt mux

On 23/07/2024 13:27, Conor Dooley wrote:
> On PolarFire SoC there are more GPIO interrupts than there are interrupt
> lines available on the PLIC, and a runtime configurable mux is used to
> decide which interrupts are assigned direct connections to the PLIC &
> which are relegated to sharing a line.
> This mux is, in our reference configuration, written by platform
> firmware during boot based on the FPGA's configuration.
> 
> Signed-off-by: Conor Dooley <conor.dooley@...rochip.com>
> ---
>  .../microchip,mpfs-gpio-irq-mux.yaml          | 79 +++++++++++++++++++
>  1 file changed, 79 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/interrupt-controller/microchip,mpfs-gpio-irq-mux.yaml
> 
> diff --git a/Documentation/devicetree/bindings/interrupt-controller/microchip,mpfs-gpio-irq-mux.yaml b/Documentation/devicetree/bindings/interrupt-controller/microchip,mpfs-gpio-irq-mux.yaml
> new file mode 100644
> index 0000000000000..89ed3a630eef3
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/interrupt-controller/microchip,mpfs-gpio-irq-mux.yaml
> @@ -0,0 +1,79 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/interrupt-controller/microchip,mpfs-gpio-irq-mux.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Microchip Polarfire SoC GPIO Interrupt Mux
> +
> +maintainers:
> +  - Conor Dooley <conor.dooley@...rochip.com>
> +
> +description: |
> +  There are 3 GPIO controllers on this SoC, of which:
> +  - GPIO controller 0 has 14 GPIOs
> +  - GPIO controller 1 has 24 GPIOs
> +  - GPIO controller 2 has 32 GPIOs
> +
> +  All GPIOs are capable of generating interrupts, for a total of 70.
> +  There are only 41 IRQs available however, so a configurable mux is used to
> +  ensure all GPIOs can be used for interrupt generation.
> +  38 of the 41 interrupts are in what the documentation calls "direct mode",
> +  as they provide an exclusive connection from a GPIO to the PLIC.
> +  The 3 remaining interrupts are used to mux the interrupts which do not have
> +  a exclusive connection, one for each GPIO controller.
> +
> +properties:
> +  compatible:
> +    const: microchip,mpfs-gpio-irq-mux
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupt-controller: true
> +
> +  "#interrupt-cells":
> +    const: 1
> +
> +  interrupts:
> +    description:
> +      The first 38 entries must be the "direct" interrupts, for exclusive
> +      connections to the PLIC. The final 3 entries must be the
> +      "non-direct"/muxed connections for each of GPIO controller 0, 1 & 2
> +      respectively.
> +    maxItems: 41
> +
> +allOf:
> +  - $ref: /schemas/interrupt-controller.yaml#

Please put allOf: after required:.

> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - "#interrupt-cells"
> +  - interrupt-controller

and here keep the same order as in properties, so
controller+cells+interrupts.

> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    irqmux: interrupt-controller@...02054 {
> +        compatible = "microchip,mpfs-gpio-irq-mux";
> +        reg = <0x20002054 0x4>;
> +        interrupt-parent = <&plic>;
> +        interrupt-controller;
> +        #interrupt-cells = <1>;
> +        status = "okay";

Drop status


Best regards,
Krzysztof