linux-kernel - Re: [PATCH v3 2/5] dt-bindings: ata: dwc-ahci: add Rockchip RK3588

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Message-ID: <399ac8fd-b5b1-50ae-c1bd-88951679cf83@linaro.org>
Date:   Tue, 13 Jun 2023 08:55:13 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Serge Semin <fancer.lancer@...il.com>
Cc:     Sebastian Reichel <sebastian.reichel@...labora.com>,
        Heiko Stuebner <heiko@...ech.de>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Damien Le Moal <damien.lemoal@...nsource.wdc.com>,
        Vinod Koul <vkoul@...nel.org>,
        Kishon Vijay Abraham I <kishon@...nel.org>,
        linux-ide@...r.kernel.org, linux-phy@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel@...labora.com
Subject: Re: [PATCH v3 2/5] dt-bindings: ata: dwc-ahci: add Rockchip RK3588

On 12/06/2023 10:52, Serge Semin wrote:
> On Mon, Jun 12, 2023 at 10:39:57AM +0200, Krzysztof Kozlowski wrote:
>> On 12/06/2023 10:35, Serge Semin wrote:
>>> On Mon, Jun 12, 2023 at 10:24:06AM +0200, Krzysztof Kozlowski wrote:
>>>> On 08/06/2023 18:22, Sebastian Reichel wrote:
>>>>> This adds Rockchip RK3588 AHCI binding. In order to narrow down the
>>>>> allowed clocks without bloating the generic binding, the description
>>>>> of Rockchip's AHCI controllers has been moved to its own file.
>>>>>
>>>>> Signed-off-by: Sebastian Reichel <sebastian.reichel@...labora.com>
>>>>> ---
>>>>
>>>> ...
>>>>
>>>>> +
>>>>> +properties:
>>>>> +  compatible:
>>>>> +    items:
>>>>> +      - enum:
>>>>> +          - rockchip,rk3568-dwc-ahci
>>>>> +          - rockchip,rk3588-dwc-ahci
>>>>> +      - const: snps,dwc-ahci
>>>>> +
>>>>> +  ports-implemented:
>>>>> +    const: 1
>>>>> +
>>>>> +patternProperties:
>>>>> +  "^sata-port@[0-9a-e]$":
>>>>> +    $ref: /schemas/ata/snps,dwc-ahci-common.yaml#/$defs/dwc-ahci-port
>>>>> +
>>>>> +    unevaluatedProperties: false
>>>>
>>>
>>>> You should be able to skip this patternProperties entirely, because it
>>>> comes from dwc-ahci-common -> ahci-common schema. Did you try the patch
>>>> without it?
>>>
> 
>>> Please see my message about this. The "sata-port@[0-9a-e]$" sub-node
>>> bindings could be updated with the "reg" property constraint which,
>>> based on the "ports-implemented" property value, most likely is
>>> supposed to be always set to const: 1.
>>
>> Then anyway the pattern is wrong as it should be @1 always.
> 
> * I miscalculated a bit, it should have been zero but in general
> the pattern-property is indeed redundant.
> 
> As a conclusion the change should look like this:
> 
> +properties:
> +  compatible:
> +    items:
> +      - enum:
> +          - rockchip,rk3568-dwc-ahci
> +          - rockchip,rk3588-dwc-ahci
> +      - const: snps,dwc-ahci
> +
> +  ports-implemented:
> +    const: 1
> +
> +  "sata-port@0":
> +    $ref: /schemas/ata/snps,dwc-ahci-common.yaml#/$defs/dwc-ahci-port
> +
> +    properties:
> +      reg:
> +        const: 0
> +
> +    unevaluatedProperties: false
> +
> + ...
> 
> Right?

Code is correct but as I said - probably meaningless. All other ports
are also accepted via referenced schema. You would need to disallow
other ports or switch to additionalProperties: false in top-level.

Best regards,
Krzysztof