linux-kernel - Re: [PATCH v2 1/3] dt-bindings: Document Blaize BLZP1600 GPIO driver

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Message-ID: <6b8583c9-3755-4b33-a454-261854e6cf2f@blaize.com>
Date: Fri, 28 Mar 2025 10:01:52 +0000
From: Neil Jones <neil.jones@...ize.com>
To: Nikolaos Pasaloukos <nikolaos.pasaloukos@...ize.com>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        James Cowgill
 <james.cowgill@...ize.com>,
        Matt Redfearn <matthew.redfearn@...ize.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski
 <brgl@...ev.pl>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>
Cc: "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2 1/3] dt-bindings: Document Blaize BLZP1600 GPIO driver

On 27/03/2025 11:27, Nikolaos Pasaloukos wrote:

> This is a custom silicon GPIO driver provided by VeriSilicon
> Microelectronics. It has 32 input/output ports which can be
> configured as edge or level triggered interrupts. It also provides
> a de-bounce feature.
> This controller is used on the Blaize BLZP1600 SoC.
>
> Signed-off-by: Nikolaos Pasaloukos <nikolaos.pasaloukos@...ize.com>
> ---
>   .../bindings/gpio/blaize,blzp1600-gpio.yaml        | 77 ++++++++++++++++++++++
>   1 file changed, 77 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/gpio/blaize,blzp1600-gpio.yaml b/Documentation/devicetree/bindings/gpio/blaize,blzp1600-gpio.yaml
> new file mode 100644
> index 0000000000000000000000000000000000000000..8b7842331a22b7b9fbfa42b9c711da99227de2e4
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/gpio/blaize,blzp1600-gpio.yaml
> @@ -0,0 +1,77 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/gpio/blaize,blzp1600-gpio.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Blaize BLZP1600 GPIO controller
> +
> +description:
> +  Blaize BLZP1600 GPIO controller is a design of VeriSilicon APB GPIO v0.2
> +  IP block. It has 32 ports each of which are intended to be represented
> +  as child noeds with the generic GPIO-controller properties as described

Typo here I assume, should be nodes ?

Also maybe better worded as:

Blaize BLZP1600 GPIO controller is an _implementation_ of the VeriSilicon APB GPIO v0.2 IP block

> +  in this binding's file.
> +
> +maintainers:
> +  - Nikolaos Pasaloukos <nikolaos.pasaloukos@...ize.com>
> +  - James Cowgill <james.cowgill@...ize.com>
> +  - Matt Redfearn <matt.redfearn@...ize.com>
> +  - Neil Jones <neil.jones@...ize.com>
> +
> +properties:
> +  $nodename:
> +    pattern: "^gpio@[0-9a-f]+$"
> +
> +  compatible:
> +    enum:
> +      - blaize,blzp1600-gpio
> +
> +  reg:
> +    maxItems: 1
> +
> +  gpio-controller: true
> +
> +  '#gpio-cells':
> +    const: 2
> +
> +  ngpios:
> +    default: 32
> +    minimum: 1
> +    maximum: 32
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  gpio-line-names: true
> +
> +  interrupt-controller: true
> +
> +  '#interrupt-cells':
> +    const: 2
> +
> +required:
> +  - compatible
> +  - reg
> +  - gpio-controller
> +  - '#gpio-cells'
> +
> +dependencies:
> +  interrupt-controller: [ interrupts ]
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +
> +    gpio: gpio@...000 {
> +      compatible = "blaize,blzp1600-gpio";
> +      reg = <0x004c0000 0x1000>;
> +      gpio-controller;
> +      #gpio-cells = <2>;
> +      ngpios = <32>;
> +      interrupt-controller;
> +      #interrupt-cells = <2>;
> +      interrupts = <GIC_SPI 3 IRQ_TYPE_LEVEL_HIGH>;
> +    };
> +...
>