Subject: Re: [PATCH v4 4/6] dt-bindings: snps, dw-apb-ssi: Add sparx5 support, plus rx-sample-delay-ns property

From: Rob Herring <[email-masked]>
Date: Mon, 27 Jul 2020 14:38:47 -0600

On Fri, Jul 24, 2020 at 01:14:02PM +0200, Lars Povlsen wrote:
> This has the following changes for the snps,dw-apb-ss DT bindings:
> 
> - Add "microchip,sparx5-spi" as the compatible for the Sparx5 SoC
>   controller
> 
> - Add the property "rx-sample-delay-ns"
> 
> Signed-off-by: Lars Povlsen <[email-masked]>
> ---
>  .../bindings/spi/snps,dw-apb-ssi.yaml         | 21 +++++++++++++++++++
>  1 file changed, 21 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/spi/snps,dw-apb-ssi.yaml b/Documentation/devicetree/bindings/spi/snps,dw-apb-ssi.yaml
> index c62cbe79f00dd..c0adaad1aa695 100644
> --- a/Documentation/devicetree/bindings/spi/snps,dw-apb-ssi.yaml
> +++ b/Documentation/devicetree/bindings/spi/snps,dw-apb-ssi.yaml
> @@ -36,6 +36,8 @@ properties:
>                - mscc,ocelot-spi
>                - mscc,jaguar2-spi
>            - const: snps,dw-apb-ssi
> +      - description: Microchip Sparx5 SoC SPI Controller
> +        const: microchip,sparx5-spi
>        - description: Amazon Alpine SPI Controller
>          const: amazon,alpine-dw-apb-ssi
>        - description: Renesas RZ/N1 SPI Controller
> @@ -93,6 +95,12 @@ properties:
>        - const: tx
>        - const: rx
>  
> +  rx-sample-delay-ns:
> +    description: Default value of the rx-sample-delay-ns property.
> +      This value will be used if the property is not explicitly defined
> +      for a SPI slave device. Default value is 0. See below.
> +    $ref: /schemas/types.yaml#/definitions/uint32

Don't need a type for properties with unit suffixes.

Also, add:

'default: 0'

> +
>  patternProperties:
>    "^.*@[0-9a-f]+$":
>      type: object
> @@ -107,6 +115,13 @@ patternProperties:
>        spi-tx-bus-width:
>          const: 1
>  
> +      rx-sample-delay-ns:
> +        description: SPI Rx sample delay offset, unit is nanoseconds.
> +          The delay from the default sample time before the actual
> +          sample of the rxd input signal occurs. The "rx_sample_delay"
> +          is an optional feature of the designware controller, and the
> +          upper limit is also subject to controller configuration.
> +
>  unevaluatedProperties: false
>  
>  required:
> @@ -129,5 +144,11 @@ examples:
>        num-cs = <2>;
>        cs-gpios = <&gpio0 13 0>,
>                   <&gpio0 14 0>;
> +      rx-sample-delay-ns = <3>;
> +      spi-flash@1 {
> +        compatible = "spi-nand";
> +        reg = <1>;
> +        rx-sample-delay-ns = <7>;
> +      };
>      };
>  ...
> -- 
> 2.27.0
> 

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