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Date: Tue, 14 May 2024 18:52:42 +0100
From: Conor Dooley <conor@kernel.org>
To: Prajna Rajendra Kumar <prajna.rajendrakumar@microchip.com>
Cc: Mark Brown <broonie@kernel.org>, Rob Herring <robh@kernel.org>,
	Krzysztof Kozlowski <krzk+dt@kernel.org>,
	linux-riscv@lists.infradead.org, linux-spi@vger.kernel.org,
	linux-kernel@vger.kernel.org, devicetree@vger.kernel.org,
	Conor Dooley <conor.dooley@microchip.com>,
	Daire McNamara <daire.mcnamara@microchip.com>,
	valentina.fernandezalanis@microchip.com
Subject: Re: [PATCH v2 1/3] spi: dt-bindings: Add num-cs property for mpfs-spi
Message-ID: <20240514-parmesan-enslave-444763e785ff@spud>
References: <20240514104508.938448-1-prajna.rajendrakumar@microchip.com>
 <20240514104508.938448-2-prajna.rajendrakumar@microchip.com>
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On Tue, May 14, 2024 at 11:45:06AM +0100, Prajna Rajendra Kumar wrote:
> The PolarFire SoC SPI "hard" controller supports eight CS lines, out of
> which only one CS line is physically wired. The default value of
> 'num-cs' was never set and it did not didn't impose a maximum value.
>=20
> To reflect this hardware limitation in the device tree, the binding
> enforces that the 'num-cs' property cannot exceed 1 unless additional
> CS lines are explicitly defined using GPIO descriptors.
>=20
> Fixes: 2da187304e55 ("spi: add bindings for microchip mpfs spi")
> Signed-off-by: Prajna Rajendra Kumar <prajna.rajendrakumar@microchip.com>
> ---
>  .../bindings/spi/microchip,mpfs-spi.yaml      | 29 +++++++++++++++++--
>  1 file changed, 26 insertions(+), 3 deletions(-)
>=20
> diff --git a/Documentation/devicetree/bindings/spi/microchip,mpfs-spi.yam=
l b/Documentation/devicetree/bindings/spi/microchip,mpfs-spi.yaml
> index 74a817cc7d94..ffa8d1b48f8b 100644
> --- a/Documentation/devicetree/bindings/spi/microchip,mpfs-spi.yaml
> +++ b/Documentation/devicetree/bindings/spi/microchip,mpfs-spi.yaml
> @@ -13,9 +13,6 @@ description:
>  maintainers:
>    - Conor Dooley <conor.dooley@microchip.com>

I provided the conditions below, so it's maybe a little disingenuous for
me to provide a review from a dt-bindings correctness point of view, but
then again I am the one listed as a maintainer for this particular
binding and what's being done here does match the hardware, so:

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

Cheers,
Conor.


> =20
> -allOf:
> -  - $ref: spi-controller.yaml#
> -
>  properties:
>    compatible:
>      oneOf:
> @@ -43,6 +40,32 @@ required:
>    - interrupts
>    - clocks
> =20
> +allOf:
> +  - $ref: spi-controller.yaml#
> +
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            const: microchip,mpfs-spi
> +    then:
> +      properties:
> +        num-cs:
> +          default: 1
> +
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            const: microchip,mpfs-spi
> +      not:
> +        required:
> +          - cs-gpios
> +    then:
> +      properties:
> +        num-cs:
> +          maximum: 1
> +
>  unevaluatedProperties: false
> =20
>  examples:
> --=20
> 2.25.1
>=20
>=20
> _______________________________________________
> linux-riscv mailing list
> linux-riscv@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-riscv

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