linux-kernel - Re: [PATCH v2 1/2] dt-bindings: gpio: brcm: Add bindings for xgs-iproc

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Date:   Thu, 17 Oct 2019 14:24:37 -0500
From:   Rob Herring <robh@...nel.org>
To:     Chris Packham <chris.packham@...iedtelesis.co.nz>
Cc:     linus.walleij@...aro.org, bgolaszewski@...libre.com,
        mark.rutland@....com, rjui@...adcom.com, sbranden@...adcom.com,
        bcm-kernel-feedback-list@...adcom.com, linux-gpio@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] dt-bindings: gpio: brcm: Add bindings for
 xgs-iproc

On Thu, Oct 17, 2019 at 04:10:50PM +1300, Chris Packham wrote:
> This GPIO controller is present on a number of Broadcom switch ASICs
> with integrated SoCs. It is similar to the nsp-gpio and iproc-gpio
> blocks but different enough to require a separate driver.
> 
> Signed-off-by: Chris Packham <chris.packham@...iedtelesis.co.nz>
> ---
> 
> Notes:
>     Changes in v2:
>     - Document as DT schema
>     - Include ngpios, #gpio-cells and gpio-controller properties
> 
>  .../bindings/gpio/brcm,xgs-iproc.yaml         | 83 +++++++++++++++++++
>  1 file changed, 83 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/gpio/brcm,xgs-iproc.yaml
> 
> diff --git a/Documentation/devicetree/bindings/gpio/brcm,xgs-iproc.yaml b/Documentation/devicetree/bindings/gpio/brcm,xgs-iproc.yaml
> new file mode 100644
> index 000000000000..71998551209e
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/gpio/brcm,xgs-iproc.yaml
> @@ -0,0 +1,83 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/gpio/brcm,xgs-iproc.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Broadcom XGS iProc GPIO controller
> +
> +maintainers:
> +  - Chris Packham <chris.packham@...iedtelesis.co.nz>
> +
> +description: |
> +  This controller is the Chip Common A GPIO present on a number of Broadcom
> +  switch ASICs with integrated SoCs.
> +
> +properties:
> +  compatible:
> +    enum:
> +      - brcm,iproc-gpio-cca

enum vs. const usage depends on whether you think you'll add more 
compatibles.

> +
> +  reg:
> +    minItems: 2
> +    maxItems: 2
> +    description:
> +      The first region defines the base I/O address containing
> +      the GPIO controller registers. The second region defines
> +      the I/O address containing the Chip Common A interrupt
> +      registers.

items:
  - description: the I/O address containing the GPIO controller 
      registers
  - description: the I/O address containing the Chip Common A interrupt 
      registers

And minItems/maxItems can be implicit.

> +
> +  gpio-controller: true
> +
> +  '#gpio-cells':
> +      const: 2
> +
> +  ngpios:
> +    $ref: /schemas/types.yaml#/definitions/uint32

Common property, doesn't need a type definition. Also, it would have to 
be under an 'allOf' to actually work.

> +    minimum: 0
> +    maximum: 32
> +
> +  interrupt-controller:
> +    type: boolean

Just 'interrupt-controller: true'

> +
> +  '#interrupt-cells':
> +    const: 2
> +
> +  interrupts:
> +    maxItems: 1
> +
> +required:
> +  - compatible
> +  - reg
> +  - "#gpio-cells"
> +  - gpio-controller
> +
> +allOf:
> + - if:
> +     properties:
> +       interrupt-controller:
> +         contains:
> +           const: true
> +   then:
> +     required:
> +       - interrupts
> +       - '#interrupt-cells'

This is mostly handled in the core schema already and 'dependencies' 
works better for this anyways. All you need here is:

dependencies:
  interrupt-controller: [ interrupts ]

> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +    gpio@...00060 {
> +        compatible = "brcm,iproc-gpio-cca";
> +        #gpio-cells = <2>;
> +        reg = <0x18000060 0x50>,
> +              <0x18000000 0x50>;
> +        ngpios = <12>;
> +        gpio-controller;
> +        interrupt-controller;
> +        #interrupt-cells = <2>;
> +        interrupts = <GIC_SPI 91 IRQ_TYPE_LEVEL_HIGH>;
> +    };
> +
> +
> +...
> -- 
> 2.23.0
>