linux-kernel - Re: [PATCH v9 3/3] dt-bindings: mtd: marvell-nand: Convert to YAML DT scheme

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <781c1db2-ecca-901a-4e11-7f7c68cf744d@linaro.org>
Date:   Fri, 16 Jun 2023 10:15:31 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Chris Packham <Chris.Packham@...iedtelesis.co.nz>,
        "miquel.raynal@...tlin.com" <miquel.raynal@...tlin.com>,
        "richard@....at" <richard@....at>,
        "vigneshr@...com" <vigneshr@...com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        "andrew@...n.ch" <andrew@...n.ch>,
        "gregory.clement@...tlin.com" <gregory.clement@...tlin.com>,
        "sebastian.hesselbarth@...il.com" <sebastian.hesselbarth@...il.com>
Cc:     "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Vadym Kochan <vadym.kochan@...ision.eu>
Subject: Re: [PATCH v9 3/3] dt-bindings: mtd: marvell-nand: Convert to YAML DT
 scheme

On 15/06/2023 23:06, Chris Packham wrote:
>>
>>> +
>>> +properties:
>>> +  compatible:
>>> +    oneOf:
>>> +      - items:
>>> +          - const: marvell,armada-8k-nand-controller
>>> +          - const: marvell,armada370-nand-controller
>>> +      - enum:
>>> +          - marvell,armada-8k-nand-controller
>> This is wrong. 8k cannot be both: compatible and not compatible with
>> 370. It's not someone's cat to be in both states at the same time...
> 
> The correct state (IMHO, Miquel correct me if I'm wrong) is `compatible 
> = "marvell,armada-8k-nand-controller";`  as there are some 8K specific 
> requirements that aren't present on the 370 (specifically the 
> system-controller and the 2nd clock). 

Presence of specific requirements does not invalidate compatibility. Two
devices are compatible if the 8k can bind and work with 370 compatible
string, even if this means some lower performance or less features (e.g.
subset of features).

Now whether they are really compatible or not - I don't know. I expect
the answer from you (as plural you).

> The only reason `compatible = 
> "marvell,armada-8k-nand-controller", 
> "marvell,armada370-nand-controller";` is supported is because that is 
> what is in use in the existing dtses.

Fix the DTS, use here the correct combination and, if it is a deviation
from old binding, mention this in commit msg.

Best regards,
Krzysztof