linux-kernel - Re: [PATCH v4 2/5] dt-bindings: spi: cadence: Add MRVL overlay bindings documentation for Cadence XSPI

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Date: Tue, 21 May 2024 12:29:13 +0200
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Witold Sadowski <wsadowski@...vell.com>, linux-kernel@...r.kernel.org,
 linux-spi@...r.kernel.org, devicetree@...r.kernel.org
Cc: broonie@...nel.org, robh@...nel.org, krzysztof.kozlowski+dt@...aro.org,
 conor+dt@...nel.org, pthombar@...ence.com
Subject: Re: [PATCH v4 2/5] dt-bindings: spi: cadence: Add MRVL overlay
 bindings documentation for Cadence XSPI

On 09/05/2024 03:05, Witold Sadowski wrote:
> Add new bindings for v2 Marvell xSPI overlay:
> mrvl,xspi-nor  compatible string

Where?

Why double space?

subject prefix: spi goes first

Please use subject prefixes matching the subsystem. You can get them for
example with `git log --oneline -- DIRECTORY_OR_FILE` on the directory
your patch is touching. For bindings, the preferred subjects are
explained here:
https://www.kernel.org/doc/html/latest/devicetree/bindings/submitting-patches.html#i-for-patch-submitters


> New compatible string to distinguish between orginal and modified xSPI
> block
> 
> PHY configuration registers
> Allow to change orginal xSPI PHY configuration values. If not set, and
> Marvell overlay is enabled, safe defaults will be written into xSPI PHY
> 
> Optional base for xfer register set
> Additional reg field to allocate xSPI Marvell overlay XFER block

I have troubles reading this. Is this some sort of one long sentence or
a list?

> 
> Signed-off-by: Witold Sadowski <wsadowski@...vell.com>
> ---
>  .../devicetree/bindings/spi/cdns,xspi.yaml    | 78 +++++++++++++++----
>  1 file changed, 65 insertions(+), 13 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/spi/cdns,xspi.yaml b/Documentation/devicetree/bindings/spi/cdns,xspi.yaml
> index eb0f92468185..094f8b7ffc49 100644
> --- a/Documentation/devicetree/bindings/spi/cdns,xspi.yaml
> +++ b/Documentation/devicetree/bindings/spi/cdns,xspi.yaml
> @@ -17,22 +17,43 @@ description: |
>  
>  allOf:
>    - $ref: spi-controller.yaml#
> +  - if:

Move the allOf after required block.

> +      properties:
> +        compatible:
> +          contains:
> +            const: marvell,cn10-xspi-nor
> +    then:
> +      properties:
> +        reg-names:
> +          items:
> +            - const: io
> +            - const: sdma
> +            - const: aux
> +            - const: xferbase
> +        reg:
> +          items:
> +            - description: address and length of the controller register set
> +            - description: address and length of the Slave DMA data port
> +            - description: address and length of the auxiliary registers
> +            - description: address and length of the xfer registers
> +    else:
> +      properties:
> +        reg-names:
> +          items:
> +            - const: io
> +            - const: sdma
> +            - const: aux
> +        reg:
> +          items:
> +            - description: address and length of the controller register set
> +            - description: address and length of the Slave DMA data port
> +            - description: address and length of the auxiliary registers
>  
>  properties:
>    compatible:
> -    const: cdns,xspi-nor
> -
> -  reg:
> -    items:
> -      - description: address and length of the controller register set
> -      - description: address and length of the Slave DMA data port
> -      - description: address and length of the auxiliary registers

Widest constraints stay here.

> -
> -  reg-names:
> -    items:
> -      - const: io
> -      - const: sdma
> -      - const: aux

Widest constraints stay here.

> +    enum:
> +      - cdns,xspi-nor
> +      - marvell,cn10-xspi-nor
>  
>    interrupts:
>      maxItems: 1
> @@ -68,6 +89,37 @@ examples:
>                  reg = <0>;
>              };
>  
> +            flash@1 {
> +                compatible = "jedec,spi-nor";
> +                spi-max-frequency = <75000000>;
> +                reg = <1>;
> +            };
> +        };
> +    };
> +  - |
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +    bus {
> +        #address-cells = <2>;
> +        #size-cells = <2>;
> +
> +        spi@...10000 {
> +            #address-cells = <1>;
> +            #size-cells = <0>;
> +            compatible = "marvell,cn10-xspi-nor";
> +            reg = <0x0 0xa0010000 0x0 0x1040>,
> +                  <0x0 0xb0000000 0x0 0x1000>,
> +                  <0x0 0xa0020000 0x0 0x100>,
> +                  <0x0 0xa0090000 0x0 0x100>;

No need for new example for difference in one property.

Best regards,
Krzysztof