Re: [PATCH 03/25] dt-bindings: net: dwmac: Fix the TSO property declaration

From: Rob Herring <robh@kernel.org>
To: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Cc: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
	Alexandre Torgue <alexandre.torgue@st.com>,
	Joao Pinto <jpinto@synopsys.com>,
	netdev@vger.kernel.org, Lars Persson <larper@axis.com>,
	linux-stm32@st-md-mailman.stormreply.com,
	Johan Hovold <johan@kernel.org>,
	Maxime Ripard <mripard@kernel.org>,
	Alexey Malahov <Alexey.Malahov@baikalelectronics.ru>,
	Jose Abreu <joabreu@synopsys.com>,
	Serge Semin <fancer.lancer@gmail.com>,
	Maxime Coquelin <mcoquelin.stm32@gmail.com>,
	Jakub Kicinski <kuba@kernel.org>,
	Giuseppe Cavallaro <peppe.cavallaro@st.com>,
	Vyacheslav Mitrofanov
	<Vyacheslav.Mitrofanov@baikalelectronics.ru>,
	"David S. Miller" <davem@davemloft.net>,
	linux-arm-kernel@lists.infradead.org,
	Pavel Parkhomenko <Pavel.Parkhomenko@baikalelectronics.ru>
Subject: Re: [PATCH 03/25] dt-bindings: net: dwmac: Fix the TSO property declaration
Date: Tue, 15 Dec 2020 11:22:40 -0600	[thread overview]
Message-ID: <20201215172240.GA4047815@robh.at.kernel.org> (raw)
In-Reply-To: <20201214091616.13545-4-Sergey.Semin@baikalelectronics.ru>

On Mon, Dec 14, 2020 at 12:15:53PM +0300, Serge Semin wrote:
> Indeed the STMMAC driver doesn't take the vendor-specific compatible
> string into account to parse the "snps,tso" boolean property. It just
> makes sure the node is compatible with DW MAC 4.x, 5.x and DW xGMAC
> IP-cores. Fix the conditional statement so the TSO-property would be
> evaluated for the compatibles having the corresponding IP-core version.
> 
> While at it move the whole allOf-block from the tail of the binding file
> to the head of it, as it's normally done in the most of the DT schemas.
> 
> Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
> 
> ---
> 
> Note this won't break the bindings description, since the "snps,tso"
> property isn't parsed by the Allwinner SunX GMAC glue driver, but only
> by the generic platform DT-parser.

But still should be valid for Allwinner?

> ---
>  .../devicetree/bindings/net/snps,dwmac.yaml   | 52 +++++++++----------
>  1 file changed, 24 insertions(+), 28 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/net/snps,dwmac.yaml b/Documentation/devicetree/bindings/net/snps,dwmac.yaml
> index e084fbbf976e..0dd543c6c08e 100644
> --- a/Documentation/devicetree/bindings/net/snps,dwmac.yaml
> +++ b/Documentation/devicetree/bindings/net/snps,dwmac.yaml
> @@ -37,6 +37,30 @@ select:
>    required:
>      - compatible
>  
> +allOf:
> +  - $ref: "ethernet-controller.yaml#"
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            enum:
> +              - snps,dwmac-4.00
> +              - snps,dwmac-4.10a
> +              - snps,dwmac-4.20a
> +              - snps,dwmac-5.10a
> +              - snps,dwxgmac
> +              - snps,dwxgmac-2.10
> +
> +      required:
> +        - compatible
> +    then:
> +      properties:
> +        snps,tso:
> +          $ref: /schemas/types.yaml#definitions/flag
> +          description:
> +            Enables the TSO feature otherwise it will be managed by
> +            MAC HW capability register.

BTW, I prefer that properties are defined unconditionally, and then 
restricted in conditional schemas (or ones that include this schema).

> +
>  properties:
>  
>    # We need to include all the compatibles from schemas that will
> @@ -314,34 +338,6 @@ dependencies:
>    snps,reset-active-low: ["snps,reset-gpio"]
>    snps,reset-delay-us: ["snps,reset-gpio"]
>  
> -allOf:
> -  - $ref: "ethernet-controller.yaml#"
> -  - if:
> -      properties:
> -        compatible:
> -          contains:
> -            enum:
> -              - allwinner,sun7i-a20-gmac

This does not have a fallback, so snps,tso is no longer validated. I 
didn't check the rest.

> -              - allwinner,sun8i-a83t-emac
> -              - allwinner,sun8i-h3-emac
> -              - allwinner,sun8i-r40-emac
> -              - allwinner,sun8i-v3s-emac
> -              - allwinner,sun50i-a64-emac
> -              - snps,dwmac-4.00
> -              - snps,dwmac-4.10a
> -              - snps,dwmac-4.20a
> -              - snps,dwxgmac
> -              - snps,dwxgmac-2.10
> -              - st,spear600-gmac
> -
> -    then:
> -      properties:
> -        snps,tso:
> -          $ref: /schemas/types.yaml#definitions/flag
> -          description:
> -            Enables the TSO feature otherwise it will be managed by
> -            MAC HW capability register.
> -
>  additionalProperties: true
>  
>  examples:
> -- 
> 2.29.2
> 

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