linux-kernel - Re: [PATCH v6 3/3] watchdog: mt7621-wdt: avoid ralink architecture dependent code

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Date:   Tue, 14 Feb 2023 10:33:29 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Sergio Paracuellos <sergio.paracuellos@...il.com>
Cc:     linux-watchdog@...r.kernel.org, wim@...ux-watchdog.org,
        linux@...ck-us.net, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, matthias.bgg@...il.com,
        arinc.unal@...nc9.com, tsbogend@...ha.franken.de,
        p.zabel@...gutronix.de, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, linux-mips@...r.kernel.org
Subject: Re: [PATCH v6 3/3] watchdog: mt7621-wdt: avoid ralink architecture
 dependent code

On 14/02/2023 09:54, Sergio Paracuellos wrote:
>>>       return 0;
>>> @@ -143,6 +147,10 @@ static int mt7621_wdt_probe(struct platform_device *pdev)
>>>       if (!drvdata)
>>>               return -ENOMEM;
>>>
>>> +     drvdata->sysc = syscon_regmap_lookup_by_compatible("mediatek,mt7621-sysc");
>>> +     if (IS_ERR(drvdata->sysc))
>>> +             return PTR_ERR(drvdata->sysc);
>>
>> This should be the backup/error path for original code using syscon
>> property. Looking up by compatible is really not portable/re-usable.
> 
> I can change the code in the way you are pointing out here but...
> Why is it not re-usable? Compatible is not supposed to be changed
> since in other cases the DTB ABI will be broken. I am totally lost
> about what is an ABI breakage, then.

How do you use it on other platform?

Best regards,
Krzysztof