[PATCH v3 01/12] spi: dt-bindings: introduce FIFO depth properties

[Conor Dooley]

On Fri, Feb 16, 2024 at 07:05:44AM +0000, Tudor Ambarus wrote:
> There are SPI IPs that can be configured by the integrator with a
> specific FIFO depth depending on the system's capabilities. For example,
> the samsung USI SPI IP can be configured by the integrator with a TX/RX
> FIFO from 8 byte to 256 bytes.
> 
> Introduce the ``fifo-depth`` property for such instances of IPs where the
> same FIFO depth is used for both RX and TX. Introduce ``rx-fifo-depth``
> and ``tx-fifo-depth`` properties for cases where the RX FIFO depth is
> different from the TX FIFO depth.
> 
> Make the dedicated RX/TX properties dependent on each other and mutual
> exclusive with the other.
> 
> Reviewed-by: Rob Herring <robh at kernel.org>
> Signed-off-by: Tudor Ambarus <tudor.ambarus at linaro.org>

Reviewed-by: Conor Dooley <conor.dooley at microchip.com>

Cheers,
Conor.

> ---
>  .../bindings/spi/spi-controller.yaml          | 27 +++++++++++++++++++
>  1 file changed, 27 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/spi/spi-controller.yaml b/Documentation/devicetree/bindings/spi/spi-controller.yaml
> index 524f6fe8c27b..093150c0cb87 100644
> --- a/Documentation/devicetree/bindings/spi/spi-controller.yaml
> +++ b/Documentation/devicetree/bindings/spi/spi-controller.yaml
> @@ -69,6 +69,21 @@ properties:
>           Should be generally avoided and be replaced by
>           spi-cs-high + ACTIVE_HIGH.
>  
> +  fifo-depth:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description:
> +      Size of the RX and TX data FIFOs in bytes.
> +
> +  rx-fifo-depth:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description:
> +      Size of the RX data FIFO in bytes.
> +
> +  tx-fifo-depth:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description:
> +      Size of the TX data FIFO in bytes.
> +
>    num-cs:
>      $ref: /schemas/types.yaml#/definitions/uint32
>      description:
> @@ -116,6 +131,10 @@ patternProperties:
>        - compatible
>        - reg
>  
> +dependencies:
> +  rx-fifo-depth: [ tx-fifo-depth ]
> +  tx-fifo-depth: [ rx-fifo-depth ]
> +
>  allOf:
>    - if:
>        not:
> @@ -129,6 +148,14 @@ allOf:
>        properties:
>          "#address-cells":
>            const: 0
> +  - not:
> +      required:
> +        - fifo-depth
> +        - rx-fifo-depth
> +  - not:
> +      required:
> +        - fifo-depth
> +        - tx-fifo-depth
>  
>  additionalProperties: true
>  
> -- 
> 2.44.0.rc0.258.g7320e95886-goog
> 
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