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

From: Lars Povlsen <[email-masked]>
Date: Tue, 28 Jul 2020 10:11:02 +0200

Rob Herring writes:

> 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'
>

Hi Rob!

Thank you for your input, all duly noted.

---Lars

>> +
>>  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
>>

-- 
Lars Povlsen,
Microchip

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