linux-kernel - Re: [PATCH 2/3] dt-bindings: spi: apple,spi: Add binding for Apple SPI controllers

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Date:   Wed, 15 Dec 2021 14:05:17 -0600
From:   Rob Herring <robh@...nel.org>
To:     Hector Martin <marcan@...can.st>
Cc:     Sven Peter <sven@...npeter.dev>, Mark Brown <broonie@...nel.org>,
        Alyssa Rosenzweig <alyssa@...enzweig.io>,
        linux-arm-kernel@...ts.infradead.org, linux-spi@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] dt-bindings: spi: apple,spi: Add binding for Apple
 SPI controllers

On Sun, Dec 12, 2021 at 12:47:25PM +0900, Hector Martin wrote:
> The Apple SPI controller is present in SoCs such as the M1 (t8103) and
> M1 Pro/Max (t600x). This controller uses one IRQ and one clock, and
> doesn't need any special properties, so the binding is trivial.
> 
> Signed-off-by: Hector Martin <marcan@...can.st>
> ---
>  .../devicetree/bindings/spi/apple,spi.yaml    | 63 +++++++++++++++++++
>  1 file changed, 63 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/spi/apple,spi.yaml
> 
> diff --git a/Documentation/devicetree/bindings/spi/apple,spi.yaml b/Documentation/devicetree/bindings/spi/apple,spi.yaml
> new file mode 100644
> index 000000000000..bcbdc8943e92
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/spi/apple,spi.yaml
> @@ -0,0 +1,63 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/spi/apple,spi.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Apple ARM SoC SPI controller
> +
> +allOf:
> +  - $ref: "spi-controller.yaml#"
> +
> +maintainers:
> +  - Hector Martin <marcan@...can.st>
> +
> +properties:
> +  compatible:
> +    items:
> +      - enum:
> +          - apple,t8103-spi
> +          - apple,t6000-spi
> +      - const: apple,spi
> +
> +  reg:
> +    maxItems: 1
> +
> +  clocks:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  power-domains:
> +    maxItems: 1
> +
> +required:
> +  - compatible
> +  - reg
> +  - clocks
> +  - interrupts

> +  - '#address-cells'
> +  - '#size-cells'

Already required by spi-controller.yaml. Otherwise,

Reviewed-by: Rob Herring <robh@...nel.org>

> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/apple-aic.h>
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +
> +    soc {
> +      #address-cells = <2>;
> +      #size-cells = <2>;
> +
> +      spi: spi@...104000 {
> +        compatible = "apple,t6000-spi", "apple,spi";
> +        reg = <0x3 0x9b104000 0x0 0x4000>;
> +        interrupt-parent = <&aic>;
> +        interrupts = <AIC_IRQ 0 1107 IRQ_TYPE_LEVEL_HIGH>;
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +        clocks = <&clk>;
> +      };
> +    };
> -- 
> 2.33.0
> 
>